Pulse or digital communications – Transceivers
Reexamination Certificate
2009-06-03
2011-11-22
Odom, Curtis (Department: 2611)
Pulse or digital communications
Transceivers
C375S267000, C375S295000, C375S347000, C375S349000, C455S101000, C455S103000, C455S500000, C455S526000
Reexamination Certificate
active
08064502
ABSTRACT:
A wireless communication apparatus compensates for phase and amplitude imbalances existing among transmit and receive branches, while also preventing likelihood information and SNR estimation error produced by such imbalance compensation. In an apparatus having a plurality of transmit and receive antennas and respective branches for each antenna, a calibration processor multiplies receive signals in each receive branch by antenna calibration coefficients, in order to correct phase and amplitude imbalances existing among the receive branches. A transmit beamforming matrix estimator then estimates a transmit beamforming matrix by using the multiplied receive signals. An estimator then solves for estimated values such as the noise power, likelihood information, and channel waveform equalization values for each receive branch, and in addition, derives a final estimated value that takes the multiplication by correction coefficients into account when averaging the estimated values for each receive branch or when computing a weighted average according to likelihood.
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Keiichi Mizutani, et al., “Performance Comparison between Feedback and Feedback-less Method to obtain CSIT in Multi-user MIMO Procdeding”, Institute of Electronics, Information and Communication Engineers technology memoir, vol. 107, No. 518, Feb. 27, 2008, FCS2007-242, pp. 335-340, (plus two cover pages).
Sawai Ryou
Takano Hiroaki
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Odom Curtis
Sony Corporation
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