A Low-Complexity Precoder for Large Multiuser MISO Systems

—In this paper, we consider the problem of precoding in large multiuser MISO systems, where by ‘large’ we mean i) large number of transmit antennas (Nt) at the base station of the order of tens to hundreds of transmit antennas, and ii) large number of downlink users (Nu) of the order of tens to hundreds of users where each user has one receive antenna. Such large MISO systems will be of immense interest because of the high capacities (sum-rates) of the order of hundreds of bits/channel use possible in such systems. We propose a vector perturbation based low-complexity precoder, termed as norm descent search (NDS) precoder, which has a complexity of just O(NuNt) per information symbol. This low complexity attribute of the precoder is achieved by searching for the perturbation vector over a reduced search space. Interestingly, in terms of BER performance, the proposed precoder achieves increasingly better BER for increasing Nt, Nu, such that for large Nt, Nu it achieves nearexponen...

• Type: Conference
• Year: 2008
• Where: VTC
• Authors: Saif K. Mohammed, Ananthanarayanan Chockalingam, B. Sundar Rajan
• Keywords: Communications, Large Miso Systems, Large Multiuser Miso, MISO Systems, VTC 2008