Patent application number | Description | Published |
20080273611 | Equalization for Zero Prefix Ofdm Systems - The system, apparatus, and method ( | 11-06-2008 |
20080285434 | System, Apparatus, and Method for Spatial Multiplexing with Symbol Spreading - The present invention provides a system ( | 11-20-2008 |
20080317168 | Integer Spreading Rotation Matrices for Qam Constellations and Its Application to Decode-Remodulate-Forward Cooperative Communication Strategy - Diversity techniques are commonly used in wireless communications to combat multi-path fading. Recent interests in ultra-wideband technology focus on multi-band OFDM systems that can explore the high diversity due to the independent frequency bands. To achieve full diversity with high data rate, a system ( | 12-25-2008 |
20090041137 | INDIVIDUAL INTERLEAVING OF DATA STREAMS FOR MIMO TRANSMISSION - The present invention, generally speaking, provides interleavers and methods of interleaving that satisfy the need for backward compatibility while effectively addressing competing design objectives. In accordance with one aspect of the invention, data is transmitted using a number of transmit antennas greater than an expected number of receive antennas. At least one pair of transmit antennas (ant′_1, ant′_) is formed, and multiple second data streams ( | 02-12-2009 |
20090074091 | INDIVIDUAL INTERLEAVING OF DATA STREAMS FOR MIMO TRANSMISSION - The present invention, generally speaking, provides interleavers and methods of interleaving that satisfy the need for backward compatibility while effectively addressing competing design objectives. In accordance with one aspect of the invention, data is transmitted using a number of transmit antennas greater than an expected number of receive antennas. At least one pair of transmit antennas is formed, and multiple second data streams are formed from a first data stream, successive bits in said first data stream being assigned to different ones of said second data streams. Block interleaving of multiple respective ones of said second data streams is individually performed. During successive transmission intervals, the pair of transmit antennas is used to transmit a pair of data symbols taken from different ones of said second data streams, followed by an equivalent transformed pair of data symbols. | 03-19-2009 |
20090190682 | SYSTEM AND METHOD FOR MAXIMUM LIKELIHOOD DECODING IN MULTIPLE OUT WIRELESS COMMUNICATION SYSTEMS - A system and method for a simplified Maximum Likelihood (ML) decoding ( | 07-30-2009 |
20090221241 | SYSTEM, APPARATUS, AND METHOD FOR ASYMMETRICAL BEAMFORMING WITH EQUAL-POWER TRANSMISSIONS - The present invention provides a plurality of embodiments for beamforming in an asymmetrical system wireless communication system ( | 09-03-2009 |
20090252248 | INDIVIDUAL INTERLEAVING OF DATA STREAMS FOR MIMO TRANSMISSION - The present invention, generally speaking, provides interleavers and methods of interleaving that satisfy the need for backward compatibility while effectively addressing competing design objectives. In accordance with one aspect of the invention, data is transmitted using a number of transmit antennas greater than an expected number of receive antennas. At least one pair of transmit antennas is formed, and multiple second data streams are formed from a first data stream, successive bits in said first data stream being assigned to different ones of said second data streams. Block interleaving of multiple respective ones of said second data streams is individually performed. During successive transmission intervals, the pair of transmit antennas is used to transmit a pair of data symbols taken from different ones of said second data streams, followed by an equivalent transformed pair of data symbols. | 10-08-2009 |
20100020739 | AUTOMATIC PARTNER SELECTION IN THE COOOPERATIVE MAC PROTOCOL - The present invention provides a system ( | 01-28-2010 |
20100027473 | METHOD OF GENERATING LOW PEAK-TO-AVERAGE POWER RATIO (PAPR) BINARY PREAMBLE SEQUENCES FOR OFDM SYSTEMS - A wireless system and method including a medium access control (MAC) layer adapted to generate low peak-to-average power ratio binary preamble sequences for orthogonal frequency division multiplexing systems described. | 02-04-2010 |
20100035568 | ROBUST SENSING FOR DETECTING SIGNALS USING CORRELATION - To quickly and robustly detect the presence of an incumbent user and rapidly relinquish the spectrum to the incumbent user when necessary, carrier recovery is performed in a receiver of the secondary user's cognitive or software radio prior to performing correlation detection with an upsampled reference signal to correct for large frequency offsets and improve the performance of the correlation detector. To detect a received signal, a pilot value is added to a reference signal. The reference signal is upsampled to a sampling frequency of the received signal. The upsampled reference signal is correlated with a demodulated baseband signal to produce a correlation value. It is then determined whether the received signal is present if the correlation value is greater than a predetermined detection threshold value. | 02-11-2010 |
20100067428 | METHOD AND SYSTEM OF BEACON TRANSMISSION AND RECEPTION - A system includes a first primary wireless system ( | 03-18-2010 |
20100119016 | FFT-BASED PILOT SENSING FOR INCUMBENT SIGNALS - The presence of an incumbent signal is detected in order to allow secondary users to share spectrum white space with incumbent users who have pre-emptive access to the spectrum. The spectrum is relinquished to the incumbent user to preclude any potential harmful interference and enable spectrum sharing. The presence of an incumbent signal ( | 05-13-2010 |
20100203911 | METHODS AND SYSTEMS FOR EXTENDING RANGE AND ADJUSTING BANDWIDTH FOR WIRELESS NETWORKS - A Communications base-station configured to operate as a hub in a wireless network and provide communication services to a set of remote customer devices using a wireless protocol is disclosed. The communications base-station includes an antenna array having a plurality of antennae arranged in a fashion as to enable the antenna array to transmit and receive wireless signals in both a substantially omnidirectional and non-omnidirectional pattern, a physical layer (PHY) device coupled to the antenna array and configured to transmit and receive wireless signals and a media access control (MAC) device coupled to the PHY device and configured to direct the antenna array to concurrently provide beamformed wireless signals to a first customer device and omnidirectional wireless signals to second customer device. | 08-12-2010 |
20100284340 | METHOD OF PACKET RETRANSMISSION AND RECEPTION AND WIRELESS DEVICE EMPLOYING THE SAME - A first wireless device communicates data to a second wireless device. The first wireless device employs at least one of a first interleaving scheme and a first sub-carrier mapping scheme to produce a first data packet from a first plurality of data bits, and transmits the first data packet to the second wireless device. When the first data packet is not received correctly by the second wireless device, then the first wireless device employs at least one of a second interleaving scheme and a second sub-carrier mapping scheme to create a second data packet from the first plurality of data bits, and transmits the second data packet to the second wireless device. | 11-11-2010 |
20100311341 | RADIO SENSOR FOR DETECTING WIRELESS MICROPHONE SIGNALS AND A METHOD THEREOF - Wireless microphone signals are detected by processing an input signal to determine a number of frequency bins within a channel frequency band having an energy level above a first predefined threshold (S | 12-09-2010 |
20110170512 | COGNITIVE RADIO DEVICE AND METHOD FOR DETERMINING CHANNEL OCCUPANCY - A detector module ( | 07-14-2011 |
20110317722 | TECHNIQUES FOR ENCODING PLCP HEADERS | 12-29-2011 |
20120013508 | WIRELESS LOCALIZATION TECHNIQUES IN LIGHTING SYSTEMS - The invention relates to a system and method for localization positioning in lighting systems. At least two of a Time Difference of Arrival (TDOA), Angle of Arrival (AOA), Received Signal Strength Index (RSSI) and a Position Estimation Algorithm with unified TDOA and RSSI are used to obtain localization positioning. The schemes introduce a maximum-likelihood estimation strategy incorporating a partial derivative matrix for each lighting unit using at least two reference nodes in order to achieve higher accuracy. | 01-19-2012 |
20120039321 | SIGNALING METHOD AND APPARATUS TO ENABLE MULTIPLE ANTENNA COMMUNICATIONS IN WIRELESS SYSTEMS | 02-16-2012 |
20120057030 | ROBUST SENSING OF DVB-T/H TRANSMISSIONS - A method and system is provided for detecting the presence of a DVB (digital video broadcasting) transmission. The method includes receiving an RF (radio frequency) signal in a selected channel ( | 03-08-2012 |
20120327871 | NON-LEGACY PREAMBLE FOR WIRELESS LOCAL AREA NETWORKS - Method and apparatus for transmission and reception of a Greenfield preamble are provided. In the method and apparatus, the Greenfield preamble may be a single user (SU) preamble or a multi user (MU) preamble. As an MU preamble, the Greenfield preamble includes a short training field (STF), a first long training field (LTF), a first signal (SIG) field, at least one additional LTF, and a second SIG field. Additionally, the Greenfield preamble may be utilized for efficient transmission and reception of control information to wireless devices, whereby the control information may be indicated using the STF, the first LTF, or the first or second SIG fields. | 12-27-2012 |
20130017791 | MEDICAL BODY AREA NETWORK (MBAN) WITH KEY-BASED CONTROL OF SPECTRUM USAGE - A medical body area network (MBAN) system ( | 01-17-2013 |
20130023214 | CENTRALIZED DYNAMIC CHANNEL ALLOCATION FOR MEDICAL BODY AREA NETWORKS - A centralized frequency agility technique is employed in conjunction with a plurality of medical body area network (MBAN) systems ( | 01-24-2013 |
20130114553 | METHOD AND SYSTEM FOR ENABLING MULTIBAND TRANSMISSION IN WIRELESS SYSTEMS | 05-09-2013 |
20130229996 | MULTI-USER PARALLEL CHANNEL ACCESS IN WLAN SYSTEMS - A method and apparatus may provide multi-user parallel channel access (MU-PCA) and/or single-user parallel channel access (SU-PCA) using transmit and/or receive with symmetrical bandwidth, in the downlink (DL), uplink (UL), or combined DL and UL. SU-PCA and MU-PCA may support unequal modulation and coding schemes (MCS) and unequal transmit power. Medium access control (MAC) layer, Physical layer (PHY), and mixed and PHY layer methods and procedures may support UL, DL and combined UL and DL SU-PCA and MU-PCA using transmit and/or receive with symmetrical bandwidth. MU-PCA and/or SU-PCA may also be supported by MAC and PHY layer designs and procedures for downlink, uplink and combined uplink and downlink using transmit/receive with asymmetrical bandwidth. | 09-05-2013 |
20130230035 | METHOD AND SYSTEM FOR BEACON INFORMATION PROVISIONING, TRANSMISSIONS AND PROTOCOL ENHANCEMENTS - A method for beacon information provisioning, transmissions and protocol enhancements includes defining multiple level beacons based on the attributes of beacon information fields/elements. A short beacon may be used in addition to a primary beacon in space-time block code (STBC) modes, non-STBC modes and in multiple bandwidth modes. The short beacons may also be used for Fast Initial Link Setup (FILS) and to extend system coverage range. Beacon transmissions may use adaptive modulation and coding set/scheme (MCS). | 09-05-2013 |
20130235773 | METHOD AND APPARATUS FOR POWER SAVINGS IN A WIRELESS LOCAL AREA NETWORK - A method and apparatus for power savings in a wireless local area network (WLAN) are disclosed. A station (STA) may receive parameters that associate the STA to a specific group of STAs and perform a channel access during a period that is allowed for the group of STAs based on the parameters. The STA may receive information regarding an access slot that is allowed for the group of STAs and access a channel during the access slot. The STA may receive a schedule for wake up from a doze state and goes in and out of the doze state based on the schedule. A highest channel access priority may be provided to a sensor or meter type of STA. The STA may indicate to an access point (AP) that the STA will not listen to a traffic indication map (TIM) or a delivery TIM (DTIM) in a beacon. | 09-12-2013 |
20130235793 | ADAPTIVE MODULATION FOR COOPERATIVE CODED SYSTEMS | 09-12-2013 |
20130286959 | METHOD AND APPARATUS FOR SUPPORTING COORDINATED ORTHOGONAL BLOCK-BASED RESOURCE ALLOCATION (COBRA) OPERATIONS - A method and apparatus may be configured to support coordinated orthogonal block-based resource allocation (COBRA) operations. An access point (AP) may be configured to indicate to a plurality of stations (STA)s that it may support COBRA. Each WTRU may be configured to indicate to the AP that it can support COBRA as well. The AP may be configured to transmit a COBRA controller information element (IE) comprising a plurality of fields to each of the WTRUs. Each WTRU may be configured to transmit a COBRA controllee IE comprising a plurality of fields. STA grouping management, group maintenance, channel access, beamforming, sounding and frequency and synchronization procedures are also described. | 10-31-2013 |
20130301551 | MULTI-USER MULTIPLE INPUT MULTIPLE OUTPUT COMMUNICATIONS IN WIRELESS LOCAL AREA NETWORKS AND WIRELESS TRANSMIT AND RECEIVE UNITS - WTRUs, access points (APs) and methods thereon are disclosed. A method on a WTRU may include receiving a message from an AP that comprises a beamformee capability element; sending a second message to the AP that comprises a beamformer capability element; and receiving, from the AP, a third message in response to the second message that indicates a group to which the WTRU is assigned. The group may be based on the beamformer capability element and the group may indicate UL transmission information to be used by the WTRU. A method on an AP may include determining a group for multiple WTRUs based on a received beamformer capability element. A method on a WTRU may include sending to an AP a message with a low overhead preamble for UL MU-MIMO. The low overhead preamble may include LTFs that enable the AP to distinguish the WTRU from other WTRUs. | 11-14-2013 |
20130301569 | METHOD AND APPARATUS FOR TRANSMITTING ACKNOWLEDGEMENTS IN RESPONSE TO RECEIVED FRAMES - A method and apparatus for transmitting acknowledgements in response to data packets in wireless communication are disclosed. A recipient may receive a plurality of data packets from a plurality of stations and transmit acknowledgements for the data packets to the originating stations in a single transmission. The acknowledgements may be transmitted using multi-user multiple-input multiple-output (MU-MIMO). Alternatively, the acknowledgements may be aggregated and transmitted in the single transmission. A short acknowledgement (ACK) frame may be sent in response to a received frame. The short ACK frame may include an ACK sequence corresponding to a sequence identity (ID) included in the received frame. The short ACK frame may include a short training field (STF) and the ACK sequence. The short ACK frame may be transmitted with a short ACK indication. The short ACK frame may be sent in response to an indication included in the received frame. | 11-14-2013 |
20130316652 | METHOD TO USE AUXILIARY CHANNEL TO ACHIEVE FAST AND POWER-EFFICIENT ASSOCIATION IN WIRELESS NETWORKS - A medical system includes one or more MBAN devices that acquire and communicate patient data. The medical system further including one or more medical body area network (MBAN) systems, each MBAN system including the one or more MBAN devices that communicate the patient data with a hub device via short-range wireless communication, the communication of the patient data via the short-range wireless communication being within a predefined spectrum. The hub device receives patient data communicated from the one or more MBAN devices and communicates with a central monitoring station via a longer range communication. The one or more MBAN devices transmit an association request to the hub device on one or more auxiliary channels to associate each MBAN device with the MBAN system, the auxiliary channels being outside the predefined spectrum. | 11-28-2013 |
20130337842 | BACKHAUL LINK ASSISTED INDOOR SPECTRUM USE ENFORCEMENT SOLUTION FOR MBAN SERVICES - A medical system includes one or more MBAN devices which acquire and communicate patient data. One or more medical body area network (MBAN) systems include the one or more MBAN devices communicating the patient data with a hub device via short-range wireless communication. The communication of the patient data via the short-range wireless communication being within a predefined spectrum. The hub device receives patient data communicated from the one or more MBAN devices, communicates with a central monitoring station via a longer range communication and one or more access points (AP), and determines the location of the MBAN system in reference to a healthcare facility. The one or more MBAN devices are inhibited from transmitting within the predefined spectrum when the MBAN hub device is located outside the healthcare facility. | 12-19-2013 |
20140093005 | METHOD FOR WIFI BEAMFORMING,FEEDBACK, AND SOUNDING (WIBEAM) - Methods for WiFi beamforming, feedback, and sounding (WiBEAM) are described. Codebook based beamforming feedback signaling and sounding mechanisms for use in wireless communications are disclosed. The methods described herein improve the feedback efficiency by using Givens rotation based decompositions and quantizing the resulting angles of the Givens rotation based decompositions using a range from a subset of [0, 2π]. Feedback may also be divided into multiple components to improve feedback efficiency/accuracy. Time domain beamforming reports for taking advantage of channel reciprocity while still taking into account practical radio frequency (RF) channel impairments are also described. Beamforming feedback that prioritizes the feedback bits in accordance with the significance of the bits is also disclosed. A preamble structure to enable the use of smoothing methods for improved channel estimation, codebook designs that may be used for codebook based beamforming feedback, and multi-resolution explicit feedback are disclosed as well. | 04-03-2014 |