Patent application number | Description | Published |
20110051859 | SYMBOL ESTIMATION METHODS AND APPARATUSES - A novel symbol estimation method produces intersymbol interference free symbols by detecting interfering symbols in an interfering channel. A channel estimate is refined for additional improvements. The method can lends itself as a serial or parallel algorithm implementation. The symbol estimation method includes using an initial estimate of received symbols and calculating a refined estimate of the received symbols using a channel estimate. The refined estimate is calculated by performing parameterization of intersymbol interference by symbols other than the symbol being refined and selecting a refined value for the symbol being refined by evaluating an optimization function. Symbol estimates are refined in multiple iterations, until a predetermined iteration termination criterion is met. Parameterization of ISI contribution of other symbols results in reduced computation by reducing total number of unknown variables in the refinement operation. | 03-03-2011 |
20110051864 | MULTI-STAGE INTERFERENCE SUPPRESSION - A multi-stage interference suppression receiver includes a short equalizer section configured to operate on a first portion of a received signal received over a channel to produce a first equalized signal and a first estimate of the channel, a channel estimator section configured to operate on the first equalized signal to produce a second equalized signal, the channel estimator section comprising a linear estimator and a non-linear estimator, a long equalizer section configured to operate on a second portion of the received signal to produce a first estimate of symbols in the received signal and a second estimate of the channel and an interference canceller section configured to operate on the first estimate of symbols in the received signal to generate a second estimate of symbols in the received signal based on, at least in part, the second estimate of the channel. | 03-03-2011 |
20110312275 | SIGNAL RECEPTION METHOD AND APPARATUS FOR NON-STATIONARY CHANNELS - A signal reception method includes receiving a signal over a channel, producing a first equalized signal, a first interference suppression filter and a first estimate of the channel using a portion of a the received signal, dividing the received signal into a plurality of signal blocks, and for each one of the plurality of signal blocks, producing a second equalized signal using a portion of the first equalized signal by selecting from one of a linear estimator or a non-linear estimator and estimating symbols received in the one of the plurality of signal blocks based on the second equalized signal. | 12-22-2011 |
20120014482 | DATA COMMUNICATION DEVICES, METHODS, & SYSTEMS - Data communication devices, methods, and systems are discussed in this application. In one embodiment, a receiving apparatus generally comprises a detector, an indicator, and a decision device. The detector can detect a number of data streams contained in a signal received on a single physical channel. Detection can be made by comparing a received signal with one or more predetermined sequences and identifying one or more of the plural predetermined sequences as being likely contained within the received signal. Each data stream can be associated with at least one predetermined sequences. The indicator can provide an indication of the data streams likely contained in the signal based on the identified sequences. A decision device can provide data defining a receiver configuration based on the indication, the receiver configuration being suitable for configuring a decoder to decode only the one or more data streams indicated as being likely contained in the signal. Other aspects, embodiments, and features are also claimed and discussed. | 01-19-2012 |
20120220292 | Preventing Dropped Calls Using Voice Services Over Adaptive Multi-User Channels on One Slot (Vamos) Mode - Embodiments of the present invention include devices, systems and methods for prevention of dropped calls. For example, a method for preventing dropped voice calls can be performed by a base station. Multiple reports are received from multiple wireless communication devices. A first wireless communication device having a poor received signal is identified using the reports. A sub-channel power imbalance ratio is adjusted so that the base station gives favorable power imbalance to the first wireless communication device over a second wireless communication device. The second wireless communication device is paired with the first wireless communication device. Adjusting the sub-channel power imbalance ratio prevents a voice call by the first wireless communication device from being dropped that would otherwise be dropped. Other aspects, embodiments and features are also claimed and described. | 08-30-2012 |
20130128942 | ADVANCED INTERFERENCE CANCELLATION FOR PRECODED GSM EDGE RADIO ACCESS NETWORK (GERAN) - An interference cancellation receiver for a pre-coded orthogonal frequency division multiplexed (OFDM) based system combines temporal interference cancellation within the OFDM framework. Multi-path equalization and inter-symbol interference (ISI) cancellation are performed on a time domain channel estimate of a received signal. An output from the multi-path equalization is transformed to the frequency domain. Inter-channel interference (ICI) is performed in the frequency domain on an equalized signal from the multi-path equalization after transforming the equalized signal from the time domain to the frequency domain. | 05-23-2013 |
20130148711 | SOFT LINEAR AND NON-LINEAR INTERFERENCE CANCELLATION - A two stage interference cancellation (IC) process includes a linear IC stage that suppresses co-channel interference (CCI) and adjacent channel interference (ACI). The linear IC stage disambiguates otherwise super-trellis data for non-linear cancellation. Soft linear IC processing is driven by a-posteriori probability (Apop) information. A second stage performs expectation maximization/Baum Welch (EM-BW) processing that reduces residual ISI left over from the first stage and also generates the Apop which drives the soft linear IC in an iterative manner. | 06-13-2013 |
20130225157 | ENHANCED SLOW ASSOCIATED CONTROL CHANNEL (ESACCH) - A method for wireless communication is described. A slow associated control channel block is received. It is determined that the slow associated control channel block fails an integrity check. A correlation level between the slow associated control channel block and one or more stored slow associated control channel blocks is determined. The stored slow associated control channel blocks are set based on a maximum correlation level. Other aspects, embodiments, and features are also claimed and described. | 08-29-2013 |
20130294550 | DECODERS AND METHODS FOR DECODING CONVOLUTIONAL CODED DATA - Decoder and communications devices including such decoders can obtain a convolutional coded bit stream including a plurality of coded data bits. According to some implementations, if a signal quality associated with the convolutional coded bit stream is above a predetermined threshold, a decoded value for each information bit may be calculated at least from a modulo 2 sum of a coded data bit added to at least one other coded data bit, at least one previously calculated information bit, or a combination of at least one other coded data bit and at least one previously calculated information bit. Also, according to some implementations, if the signal quality associated with the convolutional coded bit stream is not above the predetermined threshold, the convolutional coded bit stream may be decoded with a conventional convolutional decoding scheme. Other aspects, embodiments, and features are also claimed and described. | 11-07-2013 |
20130294551 | Devices And Methods For Obtaining And Using A Priori Information In Decoding Convolutional Coded Data - Decoders and communications devices including such decoders can obtain a convolutional coded bit stream including a plurality of coded data bits. The convolutional coded bit stream may be coded according to one or more generator polynomials such that each information bit is related to two or more coded data bits in a manner to be determinable from a mathematical combination of the two or more coded data bits of the convolutional coded bit stream. A priori information associated with each information bit can be calculated based at least in part on the mathematical combination of the two or more coded data bits. Employing the a priori information, a binary value for each information bit can be calculated. Other aspects, embodiments, and features are also claimed and described. | 11-07-2013 |
20130322234 | METHODS AND DEVICES FOR OPTIMIZED CELL ACQUISITIONS - Access terminals are adapted to blacklist one or more neighboring cells from acquisition attempts. For instance, an access terminal may receive a transmission including a list of neighboring cells to be monitored while connected to a particular serving cell. The access terminal may determine that a predefined number of consecutive acquisition attempts with a particular neighboring cell have failed. In response to failure of the predefined number of consecutive acquisition attempts, the access terminal can blacklist the neighboring cell from subsequent acquisition attempts for a predefined blacklisting period. Following the duration of the blacklisting period, the access terminal may conduct a subsequent acquisition attempt with the neighboring cell. Other aspects, embodiments, and features are also claimed and described. | 12-05-2013 |
20130322313 | METHODS AND DEVICES FOR REGULATING POWER IN WIRELESS RECEIVER CIRCUITS - Access terminals are adapted to regulate power in wireless receiver circuits. In one example, access terminals include a communications interface with at least one wireless receiver circuit. A processing circuit coupled with the communications interface can receive a transmission during a Frequency Correction Channel (FCCH) frame. Following the received transmission, at least a portion of the receiver circuit may be powered down. A determination may also be made whether the received transmission was reliable. The receiver circuit can subsequently be powered up, and another transmission can be received on a subsequent channel. When the received transmission was sufficiently reliable, the other transmission may be a transmission during a Synchronization Channel (SCH) frame. When the received transmission is not sufficiently reliable, the other transmission may be another transmission received during a subsequent Frequency Correction Channel (FCCH) frame. Other aspects, embodiments, and features are also claimed and described. | 12-05-2013 |
20130322328 | METHODS AND DEVICES FOR OPTIMIZING CELL RE ACQUISITIONS - Access terminals are adapted to employ timing information for a Synchronization Channel (SCH) associated with a neighboring base station during a re-acquisition procedure after such timing information has been determined to be inaccurate, or potentially inaccurate. For instance, an access terminal can obtain timing information for a Synchronization Channel (SCH) associated with a neighboring base station, such as by means of a combined acquisition procedure. The access terminal may subsequently determine that the obtained timing information is, or appears to be, no longer synchronized with the base station. In response to such a determination, the access terminal can employ the obtained timing information to time the opening of a receive window for re-acquiring the base station. Other aspects, embodiments, and features are also claimed and described. | 12-05-2013 |
20140064161 | METHODS AND DEVICES FOR FACILITATING EARLY HEADER DECODING IN COMMUNICATIONS DEVICES - Communications devices are adapted to receive a plurality of RF bursts of a radio block, where the plurality of RF bursts includes a number of RF bursts less than a total number of RF bursts for the radio block. A header can be decoded from the received plurality of RF burst. From the decoded header, a determination may be made whether the radio block is intended for the communications device or for another device. According to at least some examples, if the radio block is determined to be intended for another device, at least a portion of a receiver circuit of the communications device can be powered down. Also, according to at least some examples, if the radio block is determined to be intended for the receiving communications device, a data payload of the radio block may be decoded. Other aspects, embodiments, and features are also claimed and described. | 03-06-2014 |
20140112161 | QUANTITATIVE INTERFERENCE DETECTION - A method for wireless communications is described. The method includes beginning a voice call using a voice services over adaptive multi-user channels on one slot receiver. Pilot signal knowledge is obtained. Interferers knowledge is also obtained. Error metrics are computed using the pilot signal knowledge and the interferers knowledge. The method further includes selecting between the voice services over adaptive multi-user channels on one slot receiver and a legacy receiver for the voice call based on the error metrics. Other aspects, embodiments and features are also claimed and described. | 04-24-2014 |
20140119293 | OPTIMIZED SCHEDULING SUBSCRIPTION PROCEDURES ON A WIRELESS COMMUNICATION DEVICE - Devices, systems, articles of manufacture, and methods scheduling subscription procedures on a wireless communication device are described. According to some embodiments, the wireless communication device communicates with a first subscription. The wireless communication device can perform a concurrent burst-level tune-away procedure with a second subscription. The wireless communication device also returns to communication with the first subscription. The tune-away procedure enables a communication device to interact with multiple subscriptions (e.g., multiple SIM-based subscriptions). Other aspects, embodiments, and features are also claimed and described. | 05-01-2014 |
20140177591 | SYSTEMS AND METHODS FOR REDUCED LATENCY CIRCUIT SWITCHED FALLBACK - Systems, methods, and devices for wireless communication by a wireless communication device are described. A circuit switched fallback from an LTE cell to a GERAN cell is initiated. A system information type 3 message is received. The GERAN cell is accessed based on the system information type 3 message without receiving a system information type 13 message. A circuit switched connection is established on the GERAN cell. Other aspects, embodiments, and features are also claimed and described. | 06-26-2014 |
20140200046 | APPARATUS AND METHOD FOR MITIGATING VOLTAGE DROOP IN DUAL-TRANSCEIVER WIRELESS COMMUNICATION DEVICE - Aspects of the present disclosure relate to a user equipment (UE) and a method of wireless communication using the UE that includes a first transceiver and a second transceiver. The method includes determining that the first transceiver is scheduled to communicate using a first transmission simultaneous to the second transceiver being scheduled to communicate using a second transmission, and altering an operation of at least one of the first and second transceivers to mitigate battery voltage droop due to simultaneous transmissions of the transceivers. Other aspects, embodiments, and features are also claimed and described. | 07-17-2014 |
20140213235 | Method of Robust Transmit (Tx) Processing for Radio Frequency Coexistence Management in Dual-SIM-Dual-Active communication Devices - The various embodiments include a dual-SIM-dual-active (DSDA) device and methods for implementing robust transmit (Tx) processing to resolve radio frequency coexistence interference between two subscriptions operating on the DSDA device. The DSDA device may detect when one subscription (the “aggressor”) de-senses the other subscription (the “victim”) as a result of the aggressor's transmissions, and in response, implement robust Tx processing to mitigate the effects of de-sense on the victim. | 07-31-2014 |
20140243037 | TRANSMITTING POWER OPTIMIZATION ON A WIRELESS COMMUNICATION DEVICE - Devices, systems, articles of manufacture, and methods scheduling subscription procedures on a wireless communication device are described. According to some embodiments, a channel condition metric is obtained by the wireless communication device. The wireless communication device determines a number of uplink bursts to be transmitted at a non-reduced transmit power level based on the channel condition metric. The determined number uplink bursts are transmitted at the non-reduced transmit power level. Other aspects, embodiments, and features are also claimed and described. | 08-28-2014 |
20140325321 | PUNCTURING SCHEME BASED DECODER OPTIMIZATIONS - Systems and methods for decoding bitstreams are described. The bitstreams may be encoded using a punctured convolution code and received from a wireless network. A puncture pattern associated with a modulation and coding scheme used to encode the bitstream is determined, and punctured log-likelihood ratios (LLRs) generated from the bitstream are ignored while decoding the bitstream. The puncture pattern may be characterized by one or more algorithms that identify punctured LLRs in a repetitive sequence of LLRs. A decoder may exclude punctured LLRs from calculations related to bitstream decoding. The decoder may comprise a Viterbi decoder or an algebraic decoder. Other aspects, embodiments, and features are also claimed and described. | 10-30-2014 |
20140355418 | METHODS AND DEVICES FOR OPTIMIZED CELL ACQUISITIONS - Access terminals are adapted to blacklist one or more neighboring cells from acquisition attempts. For instance, an access terminal may receive a transmission including a list of neighboring cells to be monitored while connected to a particular serving cell. The access terminal may determine that a predefined number of consecutive acquisition attempts with a particular neighboring cell have failed. In response to failure of the predefined number of consecutive acquisition attempts, the access terminal can blacklist the neighboring cell from subsequent acquisition attempts for a predefined blacklisting period. Following the duration of the blacklisting period, the access terminal may conduct a subsequent acquisition attempt with the neighboring cell. Other aspects, embodiments, and features are also claimed and described. | 12-04-2014 |
20150055527 | DEVICES AND METHODS FOR FACILITATING POWER SAVINGS BY OPTIMIZED DATA BLOCK DECODES IN WIRELESS COMMUNICATIONS SYSTEMS - Access terminals are adapted to facilitate data block decoding, where a header may be decoded while a data payload is not decoded. According to one example, an access terminal can convey information from an upper layer of a protocol stack to a physical layer of the protocol stack. The conveyed information can be adapted to cause the physical layer to bypass decoding a data payload for one or more received data blocks. On receipt of a data block, a header of the received data block can be decoded at the physical layer without decoding a data payload for the received data block. Other aspects, embodiments, and features are also included. | 02-26-2015 |
20150078493 | APPARATUS AND METHOD USING COMMON CONTROL CHANNEL CARRIER FOR FREQUENCY AND TIME ESTIMATION - Apparatus and methods are disclosed to improve a user equipment's capability of performing time and frequency tracking by utilizing two carriers when the channel interference on one of the carriers is greater than a certain threshold. In one aspect of the disclosure, a user equipment (UE) determines that channel interference of a first carrier is greater than an interference threshold. The UE performs frequency tracking and time tracking in accordance with information received from a second carrier, and performs interference cancellation in accordance with the frequency tracking and time tracking. Other aspects, embodiments, and features are also claimed and described. | 03-19-2015 |
Patent application number | Description | Published |
20100046660 | INTERFERENCE CANCELLATION UNDER NON-STATIONARY CONDITIONS - A method for timing and frequency synchronization in a wireless system is provided. The method comprises the steps of receiving a burst of symbols, selecting a subset of the burst of symbols, iteratively adjusting the subset of the burst of symbols by a plurality of timing offsets and calculating, for each timing offset, a first performance metric corresponding to the adjusted subset. The method further comprises the steps of determining one of the plurality of timing offsets to be a preferred timing offset based upon the first performance metric thereof, iteratively rotating the subset of the burst of symbols by a plurality of frequency offsets and calculating, for each frequency offset, a second performance metric corresponding to the rotated subset, and determining one of the plurality of frequency offsets to be a preferred frequency offset based upon the second performance metric thereof. | 02-25-2010 |
20100046682 | ENHANCED GERAN RECEIVER USING CHANNEL INPUT BEAMFORMING - A method for suppressing interference in a wireless communication is provided. The method comprises receiving a burst of symbols, generating a plurality of timing hypotheses for the burst of symbols, and calculating, for each timing hypothesis, a plurality of weights for an interference suppression filter based upon a subset of the burst of symbols. The method further comprises, for each timing hypothesis, filtering the subset of the burst of symbols using the interference suppression filter with the corresponding plurality of weights, and selecting one of the plurality of timing hypotheses corresponding to a selection criteria. The method further comprises equalizing and decoding the filtered burst of symbols based upon the selected one of the plurality of timing hypotheses. | 02-25-2010 |
20100278035 | METHOD AND SYSTEM FOR MULTI-USER DETECTION USING TWO-STAGE PROCESSING - Systems and methods for multi-user detection in a multiple access system are provided. In one aspect, an apparatus is provided. The apparatus comprises a processing unit configured to process received chips into received symbols for a plurality of users and a computation unit configured to compute a multi-user matrix using a Hadamard matrix, wherein the multi-user matrix relates user symbols for the plurality of users to the received symbols. The apparatus further comprises a detection unit configured to detect the user symbols for the plurality of users using the received symbols and the computed multi-user matrix. | 11-04-2010 |
20100278217 | METHOD AND SYSTEM FOR MULTI-USER DETECTION USING TWO-STAGE PROCESSING - Systems and methods for multi-user detection are provided. In one aspect of the disclosure, an apparatus is provided. The apparatus comprises a processing unit configured to process a plurality of received chips into a plurality of received symbols for a plurality of users. The apparatus further comprises a computation unit configured to compute a multi-user matrix relating a plurality of user symbols for the plurality of users to the plurality of received symbols and a detection unit configured to detect the plurality of user symbols for the plurality of users using the computed multi-user matrix and the plurality of received symbols. | 11-04-2010 |
20100278227 | HYBRID SAIC RECEIVER - Systems and methods of receiving data in a communication system are disclosed. The methods include equalizing a plurality of samples to suppress intersymbol interference and provide a first set of detected bits based on a first set of reference bits comprising a training sequence on a first iteration. The methods further include suppressing co-channel interference in the plurality of input samples and provide a set of suppressed samples based on a second set of reference bits comprising the first set of detected bits on a second iteration. The methods further include equalizing the set of suppressed samples to suppress intersymbol interference and provide a second set of detected bits based on the second set of reference bits on the second iteration. | 11-04-2010 |
20110305303 | INTERFERENCE CANCELLATION UNDER NON-STATIONARY CONDITIONS - A method for timing and frequency synchronization in a wireless system is provided. The method comprises the steps of receiving a burst of symbols, selecting a subset of the burst of symbols, iteratively adjusting the subset of the burst of symbols by a plurality of timing offsets and calculating, for each timing offset, a first performance metric corresponding to the adjusted subset. The method further comprises the steps of determining one of the plurality of timing offsets to be a preferred timing offset based upon the first performance metric thereof, iteratively rotating the subset of the burst of symbols by a plurality of frequency offsets and calculating, for each frequency offset, a second performance metric corresponding to the rotated subset, and determining one of the plurality of frequency offsets to be a preferred frequency offset based upon the second performance metric thereof. | 12-15-2011 |
20140064113 | METHODS AND DEVICES FOR INCREASING DATA THROUGHPUT BY SCHEDULING OF POWER MEASUREMENTS IN A WIRELESS COMMUNICATIONS SYSTEM - Access terminals are adapted to receive and transmit data during one or more frames in a multiframe. Power measurements for a neighboring cell can be scheduled during one or more frames not intended for power measurements. In some examples, the one or more frames not intended for power measurements can include an Idle frame and/or a Packet Timing Advance Control Channel (PTCCH) frame in a 52-frame multiframe structure, as well as an Idle frame and/or a Slow Associated Control Channel (SACCH) frame in a 26-frame multiframe structure. Some access terminals may be adapted for facilitating multiple subscriptions, and may operate at least substantially simultaneously in a Connected mode subscription and an Idle mode subscription. In such instances, a neighboring cell for which power measurements are performed may be associated with the Connected mode subscription and/or the Idle mode subscription. Other aspects, embodiments, and features are also claimed and described. | 03-06-2014 |
20140274047 | ROUTING PAGING MESSAGES FOR MULTIPLE SUBSCRIPTION IDENTITIES OF A SINGLE COMMUNICATION DEVICE VIA A SINGLE PAGING CHANNEL - A method is provided for conserving power on a wireless communication device having multi-subscription capabilities. Instead of scanning different paging channels for each of a plurality of subscriptions, power may be conserved by using a single paging channel from a serving access network for all paging messages from the plurality of subscriptions. The wireless communication device may provide a serving access network information for the plurality of subscriptions, where each of the plurality of subscriptions is associated with a different paging channel. The serving access network may select or obtain a single paging channel for all paging messages from different core networks associated with the plurality of subscriptions. The wireless communication device may be informed of the selected paging channel by the access network so it monitors for paging messages for all subscriptions on that selected paging channel only. | 09-18-2014 |
20140341184 | SYSTEM AND METHODS FOR INCREASING NETWORK EFFICIENCY USING VAMOS CHANNELS ON A MULTI-SIM DEVICE - Methods are provided that optimize Voice over Adaptive Multi-user channels on One Slot (VAMOS) communications by recognizing that up to four independent communications are located on the same device, and assigning them to sub-channels of the same VAMOS channel. A VAMOS-capable multi-SIM wireless device such as a dual-SIM dual active (DSDA) device may have up to four simultaneous active calls on the same access network. When assigned to the same VAMOS channel, the up to four active calls may be merged to all use the same radio on the device. | 11-20-2014 |
20140342728 | PERFORMING NEIGHBOR CELL ACTIVITIES IN A MULTI-STACK DEVICE - Systems, methods, and devices providing a framework which reduces the amount of switching required by single transceiver hardware chain mobile devices operating multiple cellular technology and/or service stacks. The various embodiments enable two or more service stacks on the mobile device of various cellular technologies (e.g., 3GPP GSM, UMTS, LTE, WCDMA, etc), to share information, such as network measurements. The various embodiments may also enable one service stack to perform procedures for and provide information to another service stack. | 11-20-2014 |