| Patent application number | Description | Published |
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| 20080273624 | METHOD AND SYSTEM FOR CQI/PMI FEEDBACK FOR PRECODED MIMO SYSTEMS UTILIZING DIFFERENTIAL CODEBOOKS - Aspects of a method and system for CQI/PMI feedback for precoded MIMO systems utilizing differential codebooks may include generating one or more feedback messages for one or more Channel Quality Indicator (CQI) reporting units based on at least channel state information associated with the one or more CQI reporting units. One or more differential feedback messages may be generated for one or more Pre-coding Matrix Index (PMI) reporting units based on at least channel state information associated with the one or more PMI reporting units, wherein the one or more PMI reporting units span a useable bandwidth. A bandwidth and a feedback period may be assigned to each of the one or more CQI reporting units and the one or more PMI reporting units to define the one or more CQI reporting units and the one or more PMI reporting units. | 11-06-2008 |
| 20100260252 | Method and System for Cluster Processing Using Conjugate Gradient-Based MMSE Equalizer and Multiple Transmit and/or Receive Antennas for HSDPA, STTD, Closed-Loop and Normal Mode - A system and method for processing signals are disclosed. The method may include performing by one or more processors and/or circuits in a wireless device that includes a plurality of transmit and/or receive antennas for one or more of HSDPA, space-time transmit diversity (STTD), Closed Loop, Normal Mode and spatial multiplexing, the one or more processors and/or circuits comprising a minimum mean square error (MMSE) equalizer, generating a plurality of chip-rate synchronously sampled signals utilizing a plurality of received clusters. At least a portion of said generated plurality of chip-rate synchronously sampled signals may be simultaneously equalized in time domain and in spatial domain, based on a plurality of weight values calculated for the plurality of received clusters. The plurality of weight values may be iteratively computed utilizing a time-based adaptation method. | 10-14-2010 |
| 20110026618 | METHOD AND SYSTEM FOR LOW COMPLEXITY CHANNEL ESTIMATION IN OFDM COMMUNICATION NETWORKS USING CIRCULAR CONVOLUTION - A mobile device in an OFDM system receives an OFDM signal comprising a plurality of RS tones and data OFDM symbols. The received RS tones are extracted for channel estimation, which is performed by masking channel responses of the extracted RS tones. Pointers of the extracted RS tones are shifted so that the extracted RS tones are spaced in a subcarrier at regular intervals. Pointers of associated positive counted or indexed subcarriers are shifted one subcarrier lower while no pointer shifting on associated negative counted or indexed subcarriers. IFFT operation is applied to the resulting pointer shifted RS tones to determine the channel impulse responses. Desired channel taps are weighted using non-zero masking values, while undesired channel taps and/or channel tap replicas are weighted using zero. The masked channel impulse responses are back shifted in subcarrier prior to channel equalization. | 02-03-2011 |
| 20110026619 | METHOD AND SYSTEM FOR DOPPLER SPREAD AND DELAY SPREAD MATCHING WITH CHANNEL ESTIMATION BY CIRCULAR CONVOLUTION IN OFDM COMMUNICATION NETWORKS - A mobile device in an OFDM system receives an OFDM signal comprising RS tones and data OFDM symbols. The received RS tones are extracted and utilized to perform channel estimation. The resulting raw channel estimates are time filtered by matching channel time variance measured in frequency domain and in time domain, respectively. The measured channel time variance comprises inter-carrier interference measurement and Doppler spread measurement. Mean of differences between neighbor adjacent subcarriers of the extracted RS tones is used for inter-carrier interference measurement. Autocorrelation functions of the raw channel estimates are evaluated for the Doppler spread measurement using, for example, level crossing and/or axis crossing based methods. The raw channel estimates are filtered through averaging and/or recursively filtering using time filter parameters determined based on the inter-carrier interference measurement and the Doppler spread measurement. The time filtered channel estimates are utilized for data demodulation. | 02-03-2011 |
| 20110026652 | METHOD AND SYSTEM FOR DIVERSITY AND MASK MATCHING IN CHANNEL ESTIMATION IN OFDM COMMUNICATION NETWORKS USING CIRCULAR CONVOLUTION - A mobile device in an OFDM system receives an OFDM signal comprising RS tones and data OFDM symbols. The received RS tones are extracted for channel estimation using a masking operation. Masking parameters are determined by matching channel time variance using corresponding time domain samples of the extracted RS tones. As approximated channel impulse responses of transmission channels, the time samples are masked to perform the channel estimation. The channel time variance comprising inter-carrier interference and delay spread are measured, respectively. A mean of differences in power between neighbor adjacent subcarriers of the extracted RS tones is used for the inter-carrier interference measurement. The delay spread measurement such as root-mean-squared (RMS) delay spread is calculated using the approximated channel impulse responses. Masking parameters are determined based on the inter-carrier measurement and the RMS-DS measurement for generating channel estimates by masking the approximated channel impulse responses. | 02-03-2011 |
| 20110103456 | METHOD AND SYSTEM FOR LOW COMPLEXITY CONJUGATE GRADIENT BASED EQUALIZATION IN A WIRELESS SYSTEM - A method for processing signals includes, in a wireless system comprising one or more processors and/or circuits integrated within a single chip, initializing values related to at least one channel response vector and at least one correlation vector using a conjugate gradient-based (CG) algorithm. A plurality of filter taps may be updated utilizing at least one channel response vector and at least one correlation vector, for a plurality of received clusters, based on the initialized values and at least one signal-to-noise ratio (SNR) for the received signal clusters. At least a portion of the received signal clusters may be filtered utilizing at least a portion of the updated plurality of filter taps. The updating may be repeated whenever a specified signal-to-noise ratio (SNR) for the received clusters is reached. The initialized values may be updated during a plurality of iterations. | 05-05-2011 |
| 20110280237 | Method and System for Single Weight (SW) Antenna System for Single Channel (SC) MIMO - Methods and systems for processing signals in a receiver are disclosed herein and may comprise receiving WCDMA signals via M receive antennas, tracking a plurality of received clusters within the received WCDMA signals, and estimating a complex phase and amplitude of a portion of each of the received clusters. A single cluster may comprise an aggregate of received WCDMA signal paths and (M−1) phase shifters may be utilized for the estimating of the complex phase. Complex waveforms, comprising in-phase (I) and quadrature (Q) components for the received clusters within the received WCDMA signals, may be processed. The processed complex waveforms comprising the in-phase and quadrature components may be filtered to a WCDMA baseband bandwidth. A phase and/or amplitude for at least one of the received WCDMA signals may be adjusted utilizing the estimated complex phase and amplitude. The phase and/or amplitude may be adjusted continuously and/or at discrete intervals. | 11-17-2011 |
| 20110280298 | Method and System for Low Complexity Conjugate Gradient Based Equalization in a Wireless System - Methods and systems for processing signals in a receiver are disclosed herein and may include updating a plurality of filter taps utilizing at least one channel response vector and at least one correlation vector, for a plurality of received clusters, based on initialized values related to the at least one channel response vector and the at least one correlation vector. At least a portion of the received signal clusters may be filtered utilizing at least a portion of the updated plurality of filter taps. The update may be repeated whenever a specified signal-to-noise ratio (SNR) for the received signal clusters is reached. The initialized values may be updated during a plurality of iterations, and the update may be repeated whenever a specified number of the plurality of iterations is reached. | 11-17-2011 |
