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| Number | Title | Issue Date |
| 8170513 | Data detection and demodulation for wireless communication systems Techniques for detecting and demodulating data transmissions in wireless communication systems. In one aspect, a decision-directed detector detects for data transmissions in a received signal by utilizing received data symbols as well as received pilot symbols. The ... | 05/01/2012 |
| 8169944 | Random access for wireless multiple-access communication systems Techniques for facilitating random access in wireless multiple-access communication systems. A random access channel (RACH) is defined to comprise a “fast” RACH (F-RACH) and a “slow” RACH (S-RACH). The F-RACH and S-RACH can efficiently support user terminals... | 05/01/2012 |
| 8169889 | Transmit diversity and spatial spreading for an OFDM-based multi-antenna communication system A multi-antenna transmitting entity transmits data to a single- or multi-antenna receiving entity using (1) a steered mode to direct the data transmission toward the receiving entity or (2) a pseudo-random transmit steering (PRTS) mode to randomize the effective cha... | 05/01/2012 |
| 8160183 | Receiver spatial processing for eigenmode transmission in a MIMO system For eigenmode transmission with minimum mean square error (MMSE) receiver spatial processing, a transmitter performs spatial processing on NS data symbol streams with steering vectors to transmit the streams on NS spatial channels of a MIMO channel. The steering vec... | 04/17/2012 |
| 8160002 | Method and device ACK/NACK slot positioning Embodiments describe reducing interference in a wireless communication network, including an ad hoc network. According to an embodiment, a method for reducing interference includes receiving a data packet and determining a channel quality level of the received data ... | 04/17/2012 |
| 8145179 | Data detection and demodulation for wireless communication systems Techniques for detecting and demodulating data transmissions in wireless communication systems are presented. In one aspect, a decision-directed detector detects for data transmissions in a received signal by utilizing received data symbols as well as received pilot... | 03/27/2012 |
| 8144814 | Signal quality estimator Techniques for estimating signal quality in a communication system are described. Scaled errors are obtained for inphase (I) and quadrature (Q) components of detected symbols. The scaled errors are determined based on a first function having higher resolution for sm... | 03/27/2012 |
| 8134976 | Channel calibration for a time division duplexed communication system Techniques to calibrate the downlink and uplink channels to account for differences in the frequency responses of the transmit and receive chains at an access point and a user terminal. In one embodiment, pilots are transmitted on the downlink and uplink channels an... | 03/13/2012 |
| 8126953 | Multi-port mixed-radix FFT A processor for performing a fast Fourier transform or inverse fast Fourier transform comprises a radix-2 butterfly structure; and a radix-4 butterfly structure. A method of performing a fast Fourier transform or inverse fast Fourier transform comprises selectively ... | 02/28/2012 |
| 8116293 | Closed-loop rate control for a MIMO communication system In a MIMO system, rate control is achieved with an inner loop that selects rates for data streams sent via a MIMO channel and an outer loop that regulates the operation of the inner loop. For the inner loop, SNR estimates are obtained for each data stream based on r... | 02/14/2012 |
| 8107566 | Noise estimation for wireless communication Techniques for deriving and using noise estimate for data reception in a wireless communication system are described. A noise estimate may be derived for each packet received in a data transmission. Data detection may then be performed for each packet using the nois... | 01/31/2012 |
| 8107561 | Method and apparatus for carrier frequency offset estimation and frame synchronization in a wireless communication system A method for performing carrier frequency offset estimation and frame synchronization is disclosed herein. In one approach, the method includes performing a first level frequency discrimination on at least one estimated channel tap to generate a frequency discrimina... | 01/31/2012 |
| 8102944 | Mode and rate control for MIMO transmission Techniques for performing mode and rate control for a MIMO transmission are described. For mode selection, the use of an eigensteering mode is permitted if a first set of at least one criterion is satisfied. The eigensteering mode is selected for data transmission i... | 01/24/2012 |
| 8102929 | Low power ultra wideband transceiver Low-power transmitter and/or receiver devices are provided by sacrificing time and/or frequency diversity in exchange for lower power consumption. When channel conditions indicate that time and/or frequency spreading are unnecessary for transmissions, a transmitter ... | 01/24/2012 |
| 8085873 | Systems and methods for enhanced channel estimation in wireless communication systems Disclosed herein are methods and apparatus for enhancing the estimation of channel response in a wireless communication system. An apparatus (and associated method) for optimizing channel estimation in a communication system includes a receiving antenna; a receiver ... | 12/27/2011 |
| 8081728 | Method and apparatus for clock correction in MIMO OFDM A method of phase correction at a wireless device includes: estimating a phase slope for an OFDM symbol in a data portion of a packet based on an elapsed time from the start of the packet; measuring a residual phase slope from tracking pilots for the OFDM symbol in ... | 12/20/2011 |
| 8081695 | Channel estimation using frequency smoothing A system and method are provided for supplying a frequency-smoothed communications training signal. The method generates a frequency-smoothed unbiased training signal in a quadrature modulation transmitter. The frequency-smoothed unbiased training signal includes a ... | 12/20/2011 |
| 8078211 | Reallocation of excess power for full channel-state information (CSI) multiple-input, multiple-output (MIMO) systems Techniques to allocate the total transmit power to the transmission channels in a multi-channel communication system such that higher overall system spectral efficiency and/or other benefits may be achieved. The total transmit power may be initially allocated to the... | 12/13/2011 |
| 8064550 | Quadrature imbalance estimation using unbiased training sequences A system and method are provided for removing quadrature imbalance errors in received data. The method accepts an unbiased training sequence in a quadrature demodulation receiver. An unbiased training sequence has a uniform accumulated power evenly distributed in a ... | 11/22/2011 |
| 8064414 | Range extension techniques for a wireless local area network Techniques for extending transmission range in a WLAN are described. In an aspect, a receiving station determines the frequency error between a transmitting station and the receiving station based on one or more initial packet transmissions and corrects this frequen... | 11/22/2011 |
| 8045631 | Method and apparatus for packet detection in wireless communication system An apparatus for detecting an OFDM symbol encoded with a transmitted sequence including a filter having coefficients based on a simplified version of the transmitted sequence is disclosed. A computer program product having code and a wireless communications apparatu... | 10/25/2011 |
| 8040965 | Method and apparatus for processing data for transmission in a multi-channel communication system using selective channel inversion Techniques to process data for transmission over a set of transmission channels selected from among all available transmission channels. In an aspect, the data processing includes coding data based on a common coding and modulation scheme to provide modulation symbo... | 10/18/2011 |
| 8036710 | Power-efficient multi-antenna wireless device A power-efficient wireless device is equipped with multiple (N) antennas. Each antenna is associated with a transmitter unit and a receiver unit. The wireless device also has processing units used to perform various digital processing tasks. The transmitter units, r... | 10/11/2011 |
| 8019351 | Multi-hop communications in a wireless network Systems and techniques are disclosed relating to wireless communications. The systems and techniques involve wireless communications wherein a module or communications device is configured to select first and second terminal pairs, the first terminal pair having a f... | 09/13/2011 |
| 8009750 | Receiver window shaping in OFDM to mitigate narrowband interference A receiver window for symbol extraction is provided. A symbol is spread across a plurality of sub-carriers of a frequency band for transmission. If the frequency band is affected by narrowband interference, the receiver window concentrates the narrowband interferenc... | 08/30/2011 |
| 8000221 | Adaptive pilot insertion for a MIMO-OFDM system A transmitting entity transmits a “base” pilot in each protocol data unit (PDU). A receiving entity is able to derive a sufficiently accurate channel response estimate of a MIMO channel with the base pilot under nominal (or most) channel conditions. The transmit... | 08/16/2011 |
| 7995616 | Acquisition of timing information in wireless communication systems A method for identifying a reference point in time in a wireless communication system includes: receiving a first repeated sequence of symbols; receiving a second repeated sequence of symbols; performing an autocorrelation between the first and second sequences of s... | 08/09/2011 |
| 7991067 | Calibration of transmit and receive chains in a MIMO communication system Techniques for calibrating the transmit and receive chains at a wireless entity are described. For a pre-calibration, N first overall gains for a receiver unit and N transmitter units in the transmit chain are obtained, where N>1. Each first overall gain is for a co... | 08/02/2011 |
| 7991065 | Efficient computation of spatial filter matrices for steering transmit diversity in a MIMO communication system Techniques for efficiently computing spatial filter matrices are described. The channel response matrices for a MIMO channel may be highly correlated if the channel is relatively static over a range of transmission spans. In this case, an initial spatial filter matr... | 08/02/2011 |
| 7990841 | Diversity transmission modes for MIMO OFDM communication systems Techniques for transmitting data using a number of diversity transmission modes to improve reliability. At a transmitter, for each of one or more data streams, a particular diversity transmission mode is selected for use from among a number of possible transmission ... | 08/02/2011 |
| 7983356 | Enhanced frequency domain spreading A system and method are provided for using frequency domain spreading to generate real signals in the time domain. The method supplies a first complex frequency domain symbol (α) and a second complex frequency domain symbol (αi), and maps (α+jαi | 07/19/2011 |
| 7978778 | Receiver structures for spatial spreading with space-time or space-frequency transmit diversity A receiving entity obtains received symbols for a data transmission having at least one data symbol stream sent with space-time transmit diversity (STTD). The receiving entity derives an overall channel response matrix in accordance with the STTD encoding scheme use... | 07/12/2011 |
| 7978649 | Unified MIMO transmission and reception A “unified” MIMO system that supports multiple operating modes for efficient data transmission is described. Each operating mode is associated with different spatial processing at a transmitting entity. For example, four operating modes may be defined for (1) fu... | 07/12/2011 |
| 7974329 | Method and apparatus for timing estimation in a wireless communications system A method for performing symbol timing estimation is disclosed herein. In one approach, the method includes defining a search space in a plurality of estimated magnitudes of channel taps; defining a search window in the search space; and locating a symbol timing esti... | 07/05/2011 |
| 7895254 | Eigenvalue decomposition and singular value decomposition of matrices using Jacobi rotation Techniques for decomposing matrices using Jacobi rotation are described. Multiple iterations of Jacobi rotation are performed on a first matrix of complex values with multiple Jacobi rotation matrices of complex values to zero out the off-diagonal elements in the fi... | 02/22/2011 |
| 7894548 | Spatial spreading with space-time and space-frequency transmit diversity schemes for a wireless communication system Techniques for transmitting data using a combination of transmit diversity schemes are described. These transmit diversity schemes include spatial spreading, continuous beamforming, cyclic delay diversity, space-time transmit diversity (STTD), space-frequency transm... | 02/22/2011 |
| D623718 | Lower receiver for modular tactical firearms | 09/14/2010 |
| D620063 | Back design for hybrid golf club heads | 07/20/2010 |
| 7756086 | Method for communicating in dual-modes The present invention is generally directed to methods for communicating in a dual-mode communication protocol. A representative embodiment of the present invention comprises: enabling communication in a spread-spectrum communication protocol, comprising: receiving ... | 07/13/2010 |
| D619183 | Back design for iron golf club heads | 07/06/2010 |
