Title :
Error performance analysis of linear zero forcing and MMSE precoders for MIMO broadcast channels
Author :
Shao, X. ; Yuan, J. ; Shao, Y.
Author_Institution :
Sch. of Electr. Eng. & Telecommun., Univ. of New South Wales, Sydney, NSW
Abstract :
Linear precoding (LP) techniques for a multiuser multiple-input-multiple-output broadcast channel is investigated and analytical results of the achievable sum capacity and error performance for zero forcing (ZF) linear precoders is presented. It is shown that the detection signal-to- noise ratio of ZF-LP can be accurately approximated by a shrinking Chi-square distribution. The symbol error rate and its achievable diversity gain of ZF-LP are given. Then, an improved linear precoder based on the minimum mean-square error (MMSE) criterion is derived. Its error performance and sum capacity are analysed and compared with that of the ZF-LP. It is shown that the MMSE-LP can achieve much better error performance and a high sum capacity than the existing ZF-LP.
Keywords :
MIMO communication; broadcast channels; channel capacity; channel coding; diversity reception; error statistics; linear codes; mean square error methods; multiuser channels; precoding; statistical distributions; MMSE precoders; ZF linear precoders; diversity gain; error performance analysis; linear precoding techniques; linear zero forcing; minimum mean-square error criterion; multiple-input-multiple-output channel; multiuser MIMO broadcast channels; shrinking Chi-square distribution; sum capacity; symbol error rate;
Journal_Title :
Communications, IET
DOI :
10.1049/iet-com:20070037
