Fundamentals of wireless communication
Fundamentals of wireless communication
Designing DS-CDMA spreading sequences via a low-complexity deterministic approach
IEEE Transactions on Wireless Communications
Limited feedback unitary precoding for spatial multiplexing systems
IEEE Transactions on Information Theory
Efficient use of side information in multiple-antenna data transmission over fading channels
IEEE Journal on Selected Areas in Communications
Largest eigenvalue of complex Wishart matrices and performance analysis of MIMO MRC systems
IEEE Journal on Selected Areas in Communications
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In this paper, a novel precoder design method is proposed for maximizing MIMO capacity. Specifically, under equal power allocation, we employ the trellis exploration algorithm to design the precoding matrix such that the condition number of the resulting effective channel matrix is minimized. Since the trellis exploration algorithm operates on a finite set of phases, the polyphase precoder is first custom designed at the receiver. Then, a small number of bits indicating phase indices of the corresponding precoding matrix is fed back to the transmitter. We show that for a 2 × 2 MIMO, only 8 feedback bits are necessary to achieve desired performance gain. Simulation results demonstrate that the proposed approach outperforms the well-known "water-filling" scheme at high SNR in terms of ergodic capacity.