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Two techniques, i.e. differential and complementary feedbacks, are derived to reduce the feedback overhead for MIMO transmit beamforming. The unitary beamforming matrix is the cumulative product of the fed back unitary matrixes for differential feedback. The fed back matrix depicts the incremental change of the beamforming matrix and it is quantized by small vector codebooks. The overhead can be further...
The novel algorithm proposed in this paper is an optimal algorithm, both blind and training data based channel estimation algorithms are described; however, the issue of computationally efficient multiuser detection is not addressed. The multiuser detection is investigated in a long code CDMA system over frequency selective multipath channel. The issue of channel estimation is not addressed here,...
This paper proposes a novel hybrid linear prediction and QR based blind equalization algorithm. The algorithm is more robust to channel order under/over estimation. The algorithm is a data based (as opposed to channel based) algorithms and is also numerically superior. Simulations clearly indicate that our algorithm performs very well under channel order under/over estimation, when LP and QRD based...
Complex orthogonal designs of maximum possible rate of full, 3/4, and 3/4 have been presented for 2, 3, and 4 transmit antennas respectively. For 5 and 6 transmit antennas, two generalized complex orthogonal space-time block codes of rates 7/11 and 3/5 were proposed recently. In this paper, we propose three complex orthogonal space-time block codes whose rates are up to 2/3, 2/3, and 5/8 for 5, 6,...
Greedy interference avoidance provides distributed algorithms for CDMA codeword optimization. These algorithms are based on the implicit assumption that active users have access to the correlation matrix of the the received signal, which should be made available to users through a feedback channel. As a consequence the performance of greedy interference avoidance algorithms will be limited by the...
Significant capacity improvements are possible when the multiple antennas are employed at both the transmitter and receiver. However, the application of multiple antenna systems is restricted by increasing of the cost and complexity of radio frequency (RF) subsystem. The authors in J. Ahmadi-Shokouh et al. (2006) presented a novel structure which not only overcomes the aforementioned limitation but...
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