Patent application number | Description | Published |
20090245417 | TRANSMITTER CHAIN TIMING AND TRANSMIT POWER CONTROL - In a communications system, transmitter power gain can be changed between symbols. A power gain change of a first part of a transmit chain is initiated a first time, whereas a power gain change of a second part of the transmit chain is initiated at a second time, such that the resulting power gain changes of the first and second parts both occur substantially within an inter-symbol time in a desired relationship to one another. In one example, the power gain change of the first part is initiated before the beginning of the inter-symbol time to account for expected serial bus latency between initiation and execution of the power gain change of the first part. The power gain change of the second part is initiated during the inter-symbol time such that overall power does not exceed an amount (for example, a maximum permitted under a communication standard). | 10-01-2009 |
20100067480 | SYSTEMS AND METHODS EMPLOYING MULTIPLE INPUT MULTIPLE OUTPUT (MIMO) TECHNIQUES - A system has multiple antennas, a Time Division Multiplexing (TDM) module creating TDM slots, and demultiplexing circuitry inserting within the TDM slots Orthogonal Frequency Division Multiplexing (OFDM) symbols and associating the TDM slots with data sub-streams. The system also includes precoding circuitry associating the data sub-streams with multiple tones. Each of the respective tones corresponds to a respective one of the antennas. The antennas transmit the data sub-streams using the multiple tones. | 03-18-2010 |
20100103877 | SYSTEMS AND METHODS PROVIDING MOBILE TRANSMIT DIVERSITY - A method for use by a remote unit in an Evolution Data Optimized (EVDO) network includes sending transmissions to a base station, each of the transmissions corresponding to a respective one of multiple hypotheses of multiple antenna usage. The method also includes receiving feedback from the base station in response to the transmissions, the feedback being uninformed of multiple antenna usage and using the feedback to select at least one of the hypotheses. The method further includes transmitting data using a multiple-antenna scheme associated with the selected hypotheses. | 04-29-2010 |
20100184397 | METHOD AND SYSTEM FOR DC COMPENSTATION - A technique for performing AGC and DC compensation in a receiver. The receiver comprises an energy estimator for generating an estimate of the level of a received signal; an RF device to apply gain to the received signal; an AGC for controlling the RF device gain based on the energy estimation; a first DC compensation loop for finely adjusting the DC component of the received signal in fast or slow tracking mode (FTM or STM); and a second DC compensation loop for coarsely adjusting the DC component of the received signal. Three modes of AGC operations: In Acquisition, iterations of FTM fine DC adjustment, short energy estimation, and RF device gain adjustment are performed during signal timing detection. In Connected, long energy estimation, RF device gain adjustment, and STM fine and coarse DC adjustments are performed during superframe preamble. In Sleep, FTM fine DC adjustment, short energy estimation, and RF device gain adjustment are performed during superframe preamble. | 07-22-2010 |
20100291917 | SYSTEM AND METHOD FOR SUPPORTING MULTIPLE REVERSE LINK DATA STREAMS - Techniques for rank adaptation and multiple-stream reverse link communications in a wireless access network are disclosed. A remote unit transmits one or more reverse link data streams using separate identifiers to a base station. The number of reverse link data streams may be determined according to feedback from the base station or it may be determined by testing one or more multiple-antenna transmit hypotheses. The base station may estimate channel conditions using information obtained from the one or more reverse link data streams and may determine a spatial rank of the communication channel. The remote unit may perform separate error control and power control processes for each reverse link data stream in cooperation with the base station. | 11-18-2010 |
20110026574 | SIGNAL AND NOISE POWER ESTIMATION - Techniques for estimating desired signal power and noise power of a signal received over a communications channel. In an aspect, a pilot autocorrelation matrix is derived based on certain assumptions about the time delay profile, Doppler profile, and/or spatial correlation of the channel. The pilot autocorrelation matrix is decomposed into a set of eigenvectors. From the eigenvector decomposition, a set of dominant eigenvectors is selected to estimate the signal power, while a set of non-dominant eigenvectors is selected to estimate the noise power. The techniques may readily be applied to arbitrary pilot patterns and to a wide array of SNR ranges and channel conditions. | 02-03-2011 |
20110038445 | COMMUNICATIONS CHANNEL ESTIMATION - Techniques for estimating the response of a communications channel. In an aspect, a channel autocorrelation matrix is derived based on, e.g., certain assumptions about the time delay profile, Doppler profile. An eigenvector decomposition is performed on the autocorrelation matrix, and a set of dominant eigenvectors is determined. A received pilot signal vector is projected onto a projection matrix derived from the dominant eigenvectors to generate a set of eigen-coefficients, which is then used to reconstruct an estimated channel vector. In an exemplary embodiment, the eigenvector-based approach is combined with a simplified minimum mean-square error based approach to generate an estimated channel vector when the received signal-to-noise ratio is below a threshold. | 02-17-2011 |
20110194637 | APPARATUS AND METHOD FOR ENABLING UPLINK BEAMFORMING TRANSIT DIVERSITY - A method and apparatus for enabling uplink beamforming transmit diversity is provided. The method may include receiving, by a wireless communications device (WCD), a beamforming weight vector in response to transmission by the WCD of two or more pilot channels, applying the received beamforming weight vector to at least one of a first of the two or more pilot channels, one or more data channels, or one or more control channels, and transmitting, using two or more antennas, at least one of the one or more data channels or at least one of the one or more control channels, wherein the number of pilot channels is greater than or equal to the number of antennas. | 08-11-2011 |
20110256834 | METHOD AND APPARATUS TO FACILITATE SUPPORT FOR MULTI-RADIO COEXISTENCE - A method of wireless communication includes identifying one or more coexistence issues corresponding to a utilized set of communication resources of a User Equipment (UE). The method also includes communicating an indication of the coexistence issue(s) to a serving base station. | 10-20-2011 |
20120020229 | METHOD AND APPARATUS TO FACILITATE SUPPORT FOR MULTI-RADIO COEXISTENCE - A method of wireless communication includes receiving signaling from a served User Equipment (UE), via a radio access technology, indicating an interfering technology associated with coexistence issues experienced by the served UE. The method also includes calculating future subframes expected to experience coexistence issues based on previous subframes estimated to have experienced coexistence issues. | 01-26-2012 |
20120030357 | METHOD AND APPARATUS TO FACILITATE VOICE ACTIVITY DETECTION AND COEXISTENCE MANAGER DECISIONS - A system and method to facilitate voice activity detection and coexistence manager decisions is provided and include identifying a connection utilizing a first resource and a content stream corresponding to the connection, where the first resource conflicts with a second resource. The content of the content stream is classified into multiple levels based on a value of the content and then a priority is assigned to the first and second resources based on the level of the content of the first resource. | 02-02-2012 |
20120034913 | METHOD AND APPARATUS TO FACILITATE SUPPORT FOR MULTI-RADIO COEXISTENCE - Interference between potentially conflicting radio access technologies (RATs) in a wireless device may be managed through a coexistence manager. The coexistence manager allows a first active RAT to yield conflicting resources to a second idle RAT for purposes of receiving signals to allow proper operation by the second RAT. These signals may be, for example, paging signals to a Long Term Evolution (LTE) radio or beacons to a wireless local area network (WLAN) radio. | 02-09-2012 |
20120060158 | COEXISTENCE MANAGER HARDWARE/SOFTWARE IMPLEMENTATION - A method of wireless communication includes partitioning coexistence tasks between short term policy setting tasks and policy implementing tasks, processing the short term policy setting tasks using a first set of computing resources, and processing the policy implementing tasks using a second set of computing resources. The first set may be software resources configured for slower execution of tasks and the second set may be hardware resources configured for just-in-time execution of tasks. The policy may determine a time after which a first radio event is not to be interrupted and granting or denying later events based on whether they would begin before or after the do-not-interrupt time. The do-not-interrupt time may be based on a weighted priority of the first radio event. | 03-08-2012 |
20120071103 | MULTI-RADIO COEXISTENCE - A method of wireless communication includes adjusting a channel quality indicator (CQI) to compensate for coexistence interference experienced between communication resources (such as an LTE radio and a Bluetooth radio). The CQI may be set to zero, falsely indicating to a serving enhanced NodeB that a UE is out of range, thereby creating a gap in LTE operation that may be used by an alternate radio access technology. To compensate for fluctuating interference, the CQI may be adjusted to incorporate average coexistence interference over a period of time. Alternatively, the CQI at a time may incorporate coexistence interference regardless of whether interference is experienced at that specific time. A CQI value may also be boosted to compensate for a CQI backoff. CQI may be adjusted to avoid a spiral of death effect. | 03-22-2012 |
20120071106 | REDUCED TRANSMIT POWER FOR WIRELESS RADIO COEXISTENCE - In user equipments (UEs) with multiple radios, interference between those radios may be reduced by monitoring radio performance and adjusting aggressor transmit power levels to ensure victim and aggressor performance stay within desired operational levels. Various factors may determine when a reduced power approach is desired. Such factors may include aggressor transmit power, received signal strength indicator, victim error rate, throughput loss, coverage impact, etc. Various methods of reducing transmit power may be used. For example, for Long Term Evolution communications, a power headroom report may be altered to adjust a modulation coding scheme and bandwidth allocated for a particular UE. For Bluetooth communications a power control mechanism may be overridden to ensure a device stays within a desired transmit power. A power reduction loop may be employed to monitor a device's transmit power. | 03-22-2012 |
20120071185 | BUFFER STATUS REPORT CONTROL FOR CREATING TRANSMISSION GAPS - A method for wireless communication modifies an actual buffer status report value to create a modified buffer status report that is reported to a base station. The modified buffer status report value results in the base station sending fewer uplink grants to a user equipment. The fewer grants result in transmission gaps in a first radio access technology of the user equipment. The user equipment may use those transmission gaps in the first radio access technology to communicate using a second radio access technology. | 03-22-2012 |
20120093009 | METHOD AND APPARATUS TO FACILITATE SUPPORT FOR MULTI-RADIO COEXISTENCE - Interference between potentially conflicting radio access technologies (RATs) in a wireless device may be managed through a coexistence manager which allows communication using a first active RAT (e.g., Long Term Evolution (LTE)) and communication with a second active RAT (e.g., wireless local area network (WLAN)) when the first RAT is not scheduled for communicating during an uplink timeslot. Communications by a WLAN radio may be controlled using a power save mode. WLAN communications may be timed so that downlink signals (such as data or acknowledgement messages) to the WLAN radio are received during an inactive uplink subframe for an LTE radio. WLAN communications may also be timed so that downlink signals to the WLAN radio are received during downlink times scheduled for an LTE radio. | 04-19-2012 |
20120163307 | METHOD AND APPARATUS TO FACILITATE SUPPORT FOR MULTI-RADIO COEXISTENCE - A method of wireless communication includes monitoring coexistence issues among supported radios in a User Equipment (UE). The method includes determining a coexistence policy for communication resource operation within a user equipment (UE) and configuring communication resources of the user equipment in accordance with the determined coexistence policy. The policy may give priority to an LTE modem, an ISM modem, or may implement a variable priority scheme. The policy may be communicated to each modem from a host over a software messaging communication line. Modems in the UE may communicate with each other through logical lines providing real time communication. The policy may determine the operation of each modem and the treatment of the logical lines by each modem. | 06-28-2012 |
20120307749 | CONFIGURABLE FILTER FOR MULTI-RADIO INTERFERENCE MITIGATION - In a multi-radio device, a configurable filter may be placed on the transmit side of an aggressor radio to reduce interference to receive side performance of a victim radio. The filter may be adaptively configured based on performance of the victim radio. The configurable filter may be in the form of a notch filter. The depth and width of the notch filter may be configured. The filter may be used to create a virtual guard band between an Industrial Scientific and Medical (ISM) band and a cellular band by puncturing a physical uplink control channel (PUCCH) transmission nearest to the ISM band or reducing power on the nearest PUCCH transmission. | 12-06-2012 |
20120314598 | MULTI-RADIO COEXISTENCE - Prior to implementing a coexistence solution for a multi-radio device, a measurement determines whether interference experienced by one radio is caused by another radio on the device. This determination includes comparing measurements of the first radio during times when the other radio is operational and when the other radio is inactive. If the compared performance measurements are within a certain range, a coexistence/interference management solution may be implemented. | 12-13-2012 |
20120327850 | MULTI-RADIO COEXISTENCE - In a mobile device capable of wireless communications using multiple radio access technologies (RATs), transmit communications of one RAT may cause interference with receive communications of another RAT. In the case of wireless local area network (WLAN) communications, a CTS-to-Self message may control the timing of WLAN communications such that WLAN receptions do not overlap with transmissions of another RAT, such as a Long Term Evolution (LTE) radio. The CTS-to-Self message timing control may be executed by a mobile device operating as a WLAN access point. | 12-27-2012 |
20120327869 | COEXISTENCE MANAGEMENT SCHEME FOR MULTI-RADIO CO-EXISTENCE - Various aspects of the disclosure provide techniques to mitigate interference on a multi-radio device by adjusting operation of multiple radio access technologies (RATs) based on communication event combinations. A coexistence manager may create a table of communication event combinations of multiple RATs that may result in cross-RAT interference. The table may include one or more potential coexistence management schemes to be applied in the event a particular communication event combination occurs. When faced with a particular communication event combination the coexistence manager may then reference the table, and apply a corresponding coexistence management scheme. | 12-27-2012 |
20120327913 | MULTI-RADIO COEXISTENCE - In a multi-radio user equipment, communications on a Long Term Evolution (LTE) radio and Wireless Local Area Network (WLAN) radio operating in Wi-Fi mode may be aligned to reduce interference between the two radios. Communications of the WLAN radio may be aligned to the LTE radio using Notice of Absence (NoA) functionality. | 12-27-2012 |
20130003671 | MULTI-RADIO COEXISTENCE - In a mobile device, interference between different radio access technologies (RATs) may be pronounced in the presence of effects of non-linearity. To decrease interference and improve performance, a device may operate a RAT in an improved linearity mode based upon operating conditions of one or more RATs operating in the mobile device. A device may also operate a RAT in an improved noise-figure mode. | 01-03-2013 |
20130010766 | SUPPORT FOR MULTI-RADIO COEXISTENCE DURING CONNECTION SETUP - In a user equipment (UE) with multiple radio access technologies (RATs), communications of one RAT engaged in connection setup may be protected from communications of other RATs. Techniques for protecting such connection setups include performing power backoff on a potentially interfering RAT or implementing a time division multiplexing (TDM) solution alternating when certain RATs are active. | 01-10-2013 |
20130016635 | BLUETOOTH PACKET SCHEDULING RULES FOR LTE COEXISTENCE - To mitigate potential interference between radio access technologies (RATs) on a multi-RAT device, traffic scheduling rules may be implemented so that communications of the individual RATs are timed in a manner that reduces interference. For example, communications of a Bluetooth/WLAN RAT may be scheduled such that initial and responsive communications of the Bluetooth/WLAN RAT occur during sub-frames of an LTE RAT that are less likely to cause cross-RAT interference. | 01-17-2013 |
20130064111 | METHOD AND APPARATUS TO FACILITATE SUPPORT FOR MULTI-RADIO COEXISTENCE - In a multi-radio user equipment, a power backoff or similar restraint may be placed on communications of a first radio, such as LTE, in order to protect operations of a second radio, such as Bluetooth, depending on the time remaining for completion of the communications of the second radio. Such protected operations may include paging or inquiry operations. A power backoff may be applied to an LTE radio in order to protect completion of the paging or inquiry operations. The power backoff may be increased as the time to completion of the paging or inquiry operations approaches. | 03-14-2013 |
20130070653 | MULTI-RADIO COEXISTENCE - In a wireless communication device with multiple radio access technologies (RATs), frame timing for one RAT may be aligned with a frame timing of another RAT so as to reduce a number of communication frames of the different RATs that overlap in time with each other. The aligning reduces the number of communication frames that are subject to cancellation due to interference. Alignment may reduce a number of transmit frames of one RAT that overlap with multiple receive frames of another RAT. Alignment may reduce a number of receive frames of one RAT that overlap with multiple transmit frames of another RAT. | 03-21-2013 |
20130155884 | MULTI-RADIO COEXISTENCE - To comport with specific absorption rate (SAR) requirements for a transmitting multi-radio mobile device, transmissions of the multiple radios may be duplexed to ensure compliance with communication regulations. Duplexing of transmissions may occur if overall transmissions exceed a particular threshold value. The duplexing may be opportunistic or deterministic. | 06-20-2013 |
20130201883 | MULTI-RADIO COEXISTENCE - In a multi-radio user equipment (UE) for wireless communication, potential interference between the individual radios may be managed through the use of configurable logical connections between the radios. The connections send signals among the radios to indicate when a particular radio is active. The connections may be configured to indicate different activity types among the radios based on the operating conditions of the radios. | 08-08-2013 |
20130203432 | MULTI-RADIO COEXISTENCE - Frequency bands for Industrial Scientific and Medical (ISM) communications are selected to avoid interference with the cellular communication. In one aspect of the disclosure, the frequency bands for Bluetooth/WLAN communication are selected to avoid channels that are within a predetermined distance of a harmonic of a cellular (e.g., wireless wide area network) receive frequency band. That is, a frequency band is selected that is at least a predetermined distance from the cellular receive frequency bands. | 08-08-2013 |
20140079155 | SYSTEM AND METHOD FOR SUPPORTING MULTIPLE REVERSE LINK DATA STREAMS - A method for wireless communication includes determining a number of uplink data streams to transmit from a mobile device and determining a selection of antennas from a plurality of antennas for transmitting the uplink data streams. The method also includes determining beamforming parameters based at least in part on a beamforming identifier. The method further includes transmitting a first data stream via the selection of antennas in accordance with the beamforming parameters and transmitting a second data stream in response to determining that the number of uplink data streams is at least two. | 03-20-2014 |
20140086162 | ADAPTIVE NON-LINEAR INTERFERENCE CANCELLATION USING SIDE-BAND INFORMATION - A user equipment (UE) may reduce non-linear interference on a signal received at a receiving RAT by using a determined operating parameter of a transmitting radio access technology (RAT) of the user equipment (UE), which transmits a signal according to the operating parameter. The UE may estimate the non-linear interference in digital baseband to a receiving RAT of the UE from a digital baseband portion of the transmitted signal of the transmitting RAT by applying non-linear transformation based on the determined operating parameter of the transmitting RAT and cancel the estimated non-linear interference in baseband from a signal received by the receiving RAT. | 03-27-2014 |
20140219189 | PRECODING FOR SEGMENT SENSITIVE SCHEDULING IN WIRELESS COMMUNICATION SYSTEMS - Techniques to enhance the performance in a wireless communication system using segments called subbands and using precoding are shown. According to one aspect, the bandwidth for transmission to an access terminal is constrained to a preferred bandwidth which is less than the bandwidth available for transmission to an access terminal and precoding information related to the subcarriers within the constrained bandwidth is provided to a transmitter. The precoding information related to the subcarriers within a constrained bandwidth provides feedback about the forward link channel properties relative to different subbands and may be fed back on a channel associated with the bandwidth. | 08-07-2014 |
20140233444 | SYSTEMS AND METHODS FOR WIRELESS COEXISTENCE - Systems and methods are disclosed for coordinating operation of WLAN and ANT systems. A coexistence manager may determine an operating mode of the ANT transceiver and selectively enable and disable the ANT and WLAN transceivers based on the operating mode to reduce the potential for interference. | 08-21-2014 |
20140247894 | Unitary precoding based on randomized FFT matrices - Systems and methodologies are described that facilitate constructing unitary matrices that may be utilized in linear precoding for multiple-input multiple-output (MIMO) wireless communication systems. Each unitary matrix may be generated by combining (e.g., multiplying) a diagonal matrix with a Discrete Fourier Transform (DFT) matrix. The unitary matrices may be utilized to provide feedback related to a channel and/or control transmission over a channel based upon obtained feedback. | 09-04-2014 |
20140269540 | SYSTEMS AND METHODS FOR SCHEDULING WIRELESS COMMUNICATIONS - This disclosure provides coexistence strategies for a combined wireless communications device using multiple wireless protocols, such as WLAN and LTE. One or more periods having increased interference potential during an upcoming communication event of one wireless protocol may be identified and the transmission duration of another wireless protocol may be dynamically adjusted to reduce interference. In one aspect, a first period of potential interference during an upcoming LTE transmission may be predicted based on allocated LTE transmission power. The duration of the transmission may be adjusted so that a response to the transmission does not arrive during the first period. In another aspect, a second period of potential interference during an upcoming LTE reception may be predicted based on an estimated quality of LTE reception. The duration of the transmission may be adjusted so that the transmission does not being during the second period. | 09-18-2014 |
20140269644 | ACKNOWLEDGEMENT RATE MODIFICATION IN WIRELESS COMMUNICATION SYSTEMS - Embodiments determine that interference between two radio transmissions is causing, or has the potential to cause, a network device to fail to receive acknowledgement packets. In response to such a determination, the embodiments lower an acknowledgement packet transmission bit rate to increase the likelihood that an acknowledgement packet can be successfully received, thereby avoiding needless retransmission of packets that have been successfully received. | 09-18-2014 |
20140269857 | Adaptive Non-Linear Interference Cancellation For Intermodulation Distortion - A wireless communication device including two or more aggressor transmitters and a victim receiver that is adversely affected by intermodulation distortion (IMD) components associated with the signals transmitted by the two or more aggressor transmitters. Because the aggressor transmitters and the victim receiver are located on the same device, the transmit waveforms that contribute to the IMD components are known and available. More specifically, digital baseband samples used by the aggressor transmitters to generate the transmit waveforms are available. These digital baseband samples are used to reconstruct the IMD component on the wireless device. This reconstructed (estimated) IMD component is provided to the victim receiver, and is subtracted from a signal received by the victim receiver, thereby effectively removing the IMD component present in this received signal. An adaptive filter using a Volterra series can be used to estimate the IMD component in response to the transmitter digital baseband samples. | 09-18-2014 |
20140274105 | SYSTEMS AND METHODS FOR COEXISTENCE IN WLAN AND LTE COMMUNICATIONS - This disclosure provides coexistence strategies for a combined wireless communications device using multiple wireless protocols, such as WLAN and LTE. Transmission power of a system using one wireless protocol is dynamically adjusted based on a determination of operating characteristics of a system using another wireless protocol. At least one of the operating characteristics may be determined from an allocation of network resources, examples of which include the transmission frequency for an upcoming transmission and the transmission power for an upcoming transmission. Further, the transmission power may be adjusted when the reception quality of the system using the other wireless protocol is below a desired threshold. | 09-18-2014 |
20140301498 | Non-linear Interference Cancellation Across Aggressor Transmitters and Victim Receivers - Systems and methods are disclosed to implement non-linear interference cancellation (NLIC) across chips or dies in communication systems to cancel or mitigate self-jamming interference. A victim transceiver may receive an analog baseband transmit (Tx) signal from an aggressor transceiver. The analog baseband Tx signal may be tapped from a digital analog converter (DAC) of the aggressor transceiver. Alternatively, the analog baseband Tx signal may be generated by the aggressor transceiver using an auxiliary down-conversion and filtering stage. The victim transceiver may receive a composite baseband Rx signal from the victim transceiver front-end. The composite baseband Rx signal includes the desired Rx signal and an interference signal. The victim transceiver may sample the analog baseband Tx signal to generate a digital signal replica of the analog baseband Tx signal for the NLIC operation to cancel or mitigate the interference signal present in the composite baseband Rx signal. | 10-09-2014 |
20140341098 | ACCESS POINT RESPONSE TO PS-POLL - Methods, systems, and devices are described for power conservation in a wireless communications system through efficient transmissions and acknowledgements of information between an AP and a station. The time between a determination by a station to enter a power saving mode and entering network sleep mode by the station may be reduced through a transmission, by an AP, of an MPDU to the station successive to an SIFS after transmission of an acknowledgement to the station of a PS-Poll frame from the station. The time to enter a power saving mode by a station may also be reduced through transmission of A-MPDUs in which a last MPDU of the A-MPDU has an indicator bit cleared to indicate no additional data is to be transmitted. An AP may prevent a retransmission of an MPDU to the station in the absence of an acknowledgement from the station, to further enhance efficiency. | 11-20-2014 |
20140341099 | ACCESS POINT RESPONSE TO PS-POLL - Methods, systems, and devices are described for power conservation in a wireless communications system through efficient transmissions and acknowledgements of information between an AP and a station. The time between a determination by a station to enter a power saving mode and entering network sleep mode by the station may be reduced through a transmission, by an AP, of an MPDU to the station successive to an SIFS after transmission of an acknowledgement to the station of a PS-Poll frame from the station. The time to enter a power saving mode by a station may also be reduced through transmission of A-MPDUs in which a last MPDU of the A-MPDU has an indicator bit cleared to indicate no additional data is to be transmitted. An AP may prevent a retransmission of an MPDU to the station in the absence of an acknowledgement from the station, to further enhance efficiency. | 11-20-2014 |
20140341311 | Unitary precoding based on randomized FFT matrices - Systems and methodologies are described that facilitate constructing unitary matrices that may be utilized in linear precoding for multiple-input multiple-output (MIMO) wireless communication systems. Each unitary matrix may be generated by combining (e.g., multiplying) a diagonal matrix with a Discrete Fourier Transform (DFT) matrix. The unitary matrices may be utilized to provide feedback related to a channel and/or control transmission over a channel based upon obtained feedback. | 11-20-2014 |
20150024687 | SYSTEMS AND METHODS FOR COEXISTENCE BETWEEN MULTIPLE WIRELESS NETWORKS - Use is made of the Notice-of-Absence (NoA), as is a Wi-Fi/Bluetooth time sharing mechanism. This mechanism dictates ‘n’ cycles of absent and present duration of P2P-GO starting at a defined time ‘t’. The information bits of NoA are communicated from GO to the Client in the Beacons (for the period of NoA in use). Time-sharing between Bluetooth and WLAN at P2P-GO, is communicated using NoA to the P2P-Client. For the duration of both Bluetooth and WLAN radios transmitting/receiving traffic, NoA is used such that the absent duration covers the Bluetooth Interval and present-duration covers the WLAN interval. This NoA remains effective for as long as the time-sharing mode between BT and WLAN radios. As soon as, P2P-GO enters the time-sharing mode, NoA parameters are determined based on the timesharing mode (Dynamic Long and Dynamic Short). The start time of NoA schedule is determined after synchronizing to the time-sharing scheduler. The start time of NoA schedule is ‘n’ TBTTs after entering the time-sharing mode so that the Clients have ample opportunity to receive the NoA information. Until NoA schedule starts, P2P-GO may protect Bluetooth Interval using CTS2S frames. After NoA schedule comes into play, P2P-GO may send CTS2S only for asynchronous Bluetooth traffic. | 01-22-2015 |
20150063182 | DETERMINATION OF COMMUNICATION CONTROL PARAMETER BASED ON COMMUNICATION SCHEDULE - A communication control parameter for communicating via one technology is determined based on a communication schedule used in another technology. In some aspects, interference between a wireless local area network and a wireless wide area network is mitigated by appropriate selection of the communication control parameter. In some aspects, enhanced media access control features of IEEE 802.11ah are employed to facilitate co-existence between radio technologies. For example, interference may be mitigated through the use of a restricted access window, a target wake time, sectorized antennas, scheduled control information transmissions, and rate selection for control information. | 03-05-2015 |
20150065058 | NON-LINEAR INTERFERENCE CANCELLATION WITH MULTIPLE AGGRESSORS - Disclosed is non-linear interference cancellation (NLIC) on a victim receiver in a communication system in which there is self-jamming interference from multiple aggressor transmitters. The victim receiver may implement cascaded NLIC operations using multiple interference signals in succession to remove the multiple interference signals from the Rx signal and to cancel or mitigate the self-jamming interference. The reconstruction and removal of the interference signals may be ordered based on the expected level of interference from the interference signals on the desired Rx signal. The victim receiver may first perform NLIC operation using the Tx signal from the transmitter aggressor estimated to generate the strongest interference signal to remove the strongest interference signal from the Rx signal first. The victim receiver may perform NLIC operation on the TX signal from the next strongest transmitter aggressor, and so on, to remove interference signals of multiple aggressor transmitters from the Rx signal. | 03-05-2015 |
20150103758 | SYSTEMS AND METHODS FOR IDENTIFYING A RADIO ACCESS TECHNOLOGY - A method for identifying a radio access technology by an electronic device is described. The method includes generating, by a first communication circuitry, a first message that identifies a radio access technology. The first message is of a first message type. The method also includes sending, by the first communication circuitry, the first message to a second communication circuitry. The first communication circuitry and the second communication circuitry communicate with each other over a non-radio link. The method further includes sending, by the first communication circuitry, a second message associated with the first message. The second message is of a second message type that is different from the first message type. | 04-16-2015 |
20150126146 | NON-LINEAR INTERFERENCE CANCELLATION FOR MULTIPLE RECEIVER ANTENNAS - Various embodiments are disclosed for implementing joint non-linear interference cancellation (NLIC) in communication receivers with multiple receiver antennas to cancel or mitigate self-jamming interference from the same aggressor transmitter. A victim receiver may exploit the correlated nature of the interference signals received by the multiple receiver antennas to reduce the computational complexity of an NLIC scheme and improve performance. The victim receiver may select an Rx antenna/Rx chain that experiences the strongest interference from the aggressor transmitter and may perform a full NLIC operation using Tx data from the aggressor transmitter to estimate the strongest interference signal. The NLIC operation may estimate each remaining interference signal by applying a complex coefficient from a single-tap adaptive filter to the estimate of the strongest interference signal. The victim receiver may remove the estimated interference signals from the Rx signals of the respective Rx chains to cancel or mitigate the interference. | 05-07-2015 |
20150139015 | LTE Band Avoidance for RF Coexistence Interference - Various embodiments enable a multi-active mobile communication device to mitigate (manage) interference by a frequency band used by a first subscription with the frequency band used by a second subscription. The device processor may generate modified power measurements for one or more frequency bands of a first subscription and use the modified power measurement(s) to cause the first subscription to switch from the frequency band that interferes with the frequency band of the second subscription. The modified power measurement may be a decreased power measurement of the first frequency band and/or an increased power measurement of a second frequency band that does not interfere with the frequency band of the second subscription. As a result, various embodiments may mitigate or otherwise manage the impact of coexistence interference between the first and second subscriptions of a multi-active mobile communication device without limiting capabilities of the device or changes to the network. | 05-21-2015 |
20150139122 | SHARED NON-LINEAR INTERFERENCE CANCELLATION MODULE FOR MULTIPLE RADIOS COEXISTENCE AND METHODS FOR USING THE SAME - Certain aspects of the present methods and apparatus provide a scheme to implement a generic Non-Linear Interference Cancelation (NLIC) module that can be interfaced with any topology of aggressor-victim transmitters and/or receivers of any (e.g., one or more) radio-access technology residing on the same communication device. | 05-21-2015 |
20150146548 | ADAPTIVE REMOTE WI-FI CLIENT POWER CONTROL TO AVOID LOCAL RECEIVER DESENSE - A method and apparatus for communicating in a wireless network includes an AP having multiple radios, a first one of which communicates with a nearby client node and a second one of which receives power on another wireless protocol operating in the same or close frequency band as the first radio. The first radio is configured to remotely control the transmit power of the client node so that it doesn't interfere with the reception performance of the second radio. A beacon or probe response frame is used to reduce transmit power of the client node and a CTS2S signal is used to selectively terminate client node transmit power entirely over short periods so that the reception performance of the other wireless device is not severely compromised or desensed by the client node and can be evaluated according to comparative performance criteria such as signal to interference plus noise ratio. | 05-28-2015 |
20150200697 | INTERFERENCE CANCELATION USING COOPERATIVE SENSING - A first receiver of a victim communication device may detect a first signal from an aggressor transmitter that potentially may interfere with a second signal intended to be received at a second receiver of the victim communication device. It may be determined whether the first signal interferes with the second signal based, at least in part, on the characteristics of the first signal and the second receiver. If the first signal may interfere with the second signal, the second receiver may implement reconstruction and cancelation of the interference attributable to the first signal. | 07-16-2015 |
20150311929 | INTERFERENCE CANCELLATION USING INTERFERENCE MAGNITUDE AND PHASE COMPONENTS - A communication device can independently determine an interference magnitude component and an interference phase component for interference cancellation. The interference magnitude component may be estimated based, at least in part, on a magnitude polynomial expansion and a transmit signal of the communication device. The interference phase component may be estimated based, at least in part, on a phase polynomial expansion and the transmit signal. The magnitude polynomial expansion and the phase polynomial expansion may have different polynomial terms. The interference signal may be determined based, at least in part, on the interference magnitude component and the interference phase component. At least a portion of the interference signal may be cancelled from a receive signal received by the communication device. | 10-29-2015 |
20160037520 | WLAN PACKET-BY-PACKET BANDWIDTH SCHEDULING FOR LTE COEXISTENCE - The use of multiple radios using different radio access technologies (RATs) on a wireless station can result in interference that can be mitigated by reducing, on a packet-by-packet basis, the bandwidths of communications using one of the RATs. For example, the bandwidth of wireless local area network (WLAN) communications sent or received by a wireless station can be reduced in order to avoid interference with Long-term Evolution (LTE) or LTE-Advanced (LTE-A) communications. A wireless station can determine that only a portion of an interfering bandwidth used by a first radio will interfere with the receipt of communications on a second radio, then the wireless station can dynamically adjust its transmissions on the first radio to only use non-interfering frequencies. | 02-04-2016 |
20160037544 | SPECTRUM ANALYSIS AND OPERATION OF A DUAL RADIO DEVICE - Methods, systems, and devices are described for wireless communications in which an unlicensed spectrum may be used for cellular communications (e.g., Long Term Evolution (LTE) communications). More particularly, the described features relate to improving resource management in a multi-radio or multi-modem wireless device by utilizing one radio or modem (e.g., a wireless local area network (WLAN) radio) to inform the operation of another radio or modem (e.g., an LTE radio) co-located on the wireless device. The monitoring radio (e.g., WLAN radio) may scan an unlicensed or shared spectrum for interfering signals (e.g., military, weather, etc.) transmitted on designated channels within the shared spectrum. Upon detection of the interfering signal, the monitoring radio may generate a spectrum analysis of the detected interference and inform the second radio (e.g., LTE radio) to modify its operation based on the spectrum analysis. | 02-04-2016 |
20160065251 | SELECTING A PRECODING CONFIGURATION BASED ON SELF-JAMMING METRICS - A method for wireless communication by a wireless communication device is described. The wireless communication device determines that an aggressor radio in the wireless communication device is causing (or can potentially cause) self-jamming to a victim radio in the wireless communication device. A precoding configuration is selected based on one or more link throughput metrics and one or more self-jamming metrics. The precoding configuration is applied to transmissions of the aggressor radio. | 03-03-2016 |
20160080017 | ADAPTIVE RADIO FREQUENCY LOCAL OSCILLATOR TUNING - Methods, systems, and devices are described for adaptively or dynamically tuning a radio frequency (RF) local oscillator (LO) for wireless communications. In one example, a radio may receive an RF signal and the LO of a radio may be tuned to a frequency that is an offset from its reception (RX) center frequency to deal with interference from another signal, such as one being transmitted using a different radio access technology (RAT) than that of the radio. The offset may be determined based upon an effect of the tuning on an attribute of the RF signal. In addition, the offset may be determined based on interference caused by the other signal. | 03-17-2016 |
20160081044 | ALIGNING WIRELESS LOCAL AREA NETWORK OPERATIONS WITH POWER HEADROOM REPORTING - Methods, systems, apparatuses, and devices are described for aligning wireless local area network (WLAN) operations with reporting of transmit power information via a cellular network. A mobile device may identify information to be communicated for a WLAN operations. The mobile device may determine a reporting schedule for transmit power information to a serving base station of the cellular network. The information may be communicated on a schedule determined based on the reporting schedule for transmit power information. The information communicated for the WLAN operation may be communicated between subsequent reporting instances for the transmit power information. | 03-17-2016 |
20160088634 | WIRELESS PACKET SCHEDULING FOR SATELLITE POSITIONING SYSTEM COEXISTENCE - Techniques are disclosed for managing wireless transmission duty cycle on a mobile device to mitigate interference during reception of one or more satellite-based positioning signals and transmission of one or more wireless signals, involving (1) determining a first transmission duty cycle, the first transmission duty cycle reflecting a proportion of a time duration occupied by transmission of the one or more wireless signals and (2) delaying transmission of a first wireless packet or transmitting at least one portion of the first wireless packet via the one or more wireless signals, based on a comparison of the first transmission duty cycle and a duty cycle threshold. | 03-24-2016 |
20160105902 | TRANSMISSION COORDINATION FOR COLLOCATED RADIOS - Methods, systems, and devices are described for wireless communication at a wireless device having collocated radios employing different radio access technologies (RATs). For example, a second radio of the wireless device may receive a first scheduling message. The first scheduling message may include information relating to timing, priority, transmission power, and radio capabilities. Using this scheduling message, a determination of whether a first radio employing a first RAT and the second radio employing a second RAT can transmit in parallel may be made. A first transmission on the first radio may be coordinated with a second transmission on the second radio based on the determination of whether the first radio and the second radio can transmit in parallel. A number of data units may be aggregated into an aggregate frame to be transmitted by the second radio. The number of data units may be based on the scheduling message. | 04-14-2016 |
20160119072 | INTER-RAT INTERFERENCE CANCELLATION - Methods, systems, and devices are described for eliminating interference from a convoluted signal comprising several signals of different radio access technologies (RATs), such as a Long Term Evolution (LTE) signal and wireless local area network (WLAN) signal, in an unlicensed or shared radio frequency spectrum band are described. In accordance with the present disclosure, a dual-radio mobile device may utilize a multiple radios to assist in the operation of interference cancellation. Specifically, in some examples, a first radio (e.g., WLAN radio) may process the received convoluted signal to reconstruct a first signal (e.g., WLAN signal). The reconstructed first signal may be utilized by a second radio (e.g., LTE radio) to identify a second signal (e.g., LTE signal) in the received convoluted signal by cancelling or removing the reconstructed first signal from the convoluted signal. | 04-28-2016 |
20160119942 | SYSTEMS AND METHODS FOR ALIGNING MULTIPLE RADIO ACCESS TECHNOLOGIES - A method is described. The method includes determining channel quality report timing for a first radio access technology (RAT). The method also includes aligning scan timing for a second RAT with the channel quality report timing of the first RAT. The method further includes sending a first channel quality report to a base station that indicates lower-rank multiple-input and multiple-output (MIMO) is available for the first RAT when the second RAT performs a scan. The method additionally includes sending a second channel quality report to the base station that indicates higher-rank MIMO is available upon completion of the scan. | 04-28-2016 |
20160127993 | ANTENNA TUNER CONTROL FOR WAN/WLAN ANTENNA SHARING - Methods, systems, and devices are described for wireless communication at a UE. The UE may communicate using a shared antenna communicatively coupled with a first radio and a second radio. When the UE identifies an upcoming transition to a sleep mode for the first radio, a tune code for the shared antenna may be adjusted for the second radio. A tune code query may be transmitted to the second radio which may respond with a tune code response. Adjusting the tune code may be based on the tune code response. This allows the second radio to communicate using the shared antenna while the first radio is in the sleep mode. When the UE identifies a transition from the sleep mode for the first radio, the UE may adjust the tune code for the shared antenna for the first radio, allowing the first radio to communicate using the shared antenna. | 05-05-2016 |