RECURSIVE AND TRELLIS-BASED FEEDBACK REDUCTION FOR MIMO-OFDM WITH RATE-LIMITED FEEDBACK
摘要
<p>Techniques are provided for reducing feedback while maintaining performance in a MIMO-OFDM system. The disclosed techniques employ finite- rate feedback methods that uses vector quantization compression. The disclosed methods/techniques generally involve: receiving a plurality of symbols from a plurality of sub-carriers at a receiver; selecting a plurality of indices of codewords corresponding to a codebook of pre-coding weighting matrices for the sub-carriers based on vector quantization compression of the codewords; and transmitting the selected indices over a wireless channel to a transmitter. Finite state vector quantization feedback makes use of a finite state vector quantizer (FSVQ), which is a recursive vector quantizer (VQ) with a finite number of states. In finite state vector quantization feedback, optimal precoding matrices (beamforming vectors) are selected sequentially across subcarriers. In a trellis-based feedback method, the optimal precoding matrices are selected at the same time for all subcarriers by searching for the optimum choice of matrices along a trellis using the Viterbi algorithm (dynamic programming).</p>
申请公布号
WO2007094832(A2)
申请公布日期
2007.08.23
申请号
WO2006US44373
申请日期
2006.11.15
申请人
THE UNIVERSITY OF CONNECTICUT;ZHOU, SHENGLI;LI, BAOSHENG;WILLETT, PETER