Soft-output MMSE V-BLAST detector under ML channel estimation and channel correlation

Author

Wang, Jun ; Wen, Oliver Yu ; Li, Shaoqian

Author_Institution

Nat. Key Lab. of Commun., Univ. of Electron. Sci. & Technol. of China, Chengdu

Volume

13

Issue

2

fYear

2009

fDate

2/1/2009 12:00:00 AM

Firstpage

103

Lastpage

105

Abstract

Channel estimation errors have not been taken into account by existing soft-output minimum mean square error (MMSE) vertical Bell Lab Space Time (V-BLAST) detectors. As a result, the system performance will be degraded under practical channel estimation. In this letter, we propose a novel soft-output MMSE V-BLAST detector, which takes the estimation error of maximum likelihood (ML) multiple-input multiple-output (MIMO) channel estimation and receiver spatially correlation into account in the computation of the MMSE filter and log likelihood ratio (LLR) of each coded bit. When compared with existing MMSE V-BLAST detectors, simulation results show that the proposed novel detector can obtain sizable performance gain.

Keywords

MIMO communication; channel estimation; least mean squares methods; maximum likelihood estimation; signal detection; MIMO channel estimation; V-BLAST detectors; channel correlation; log likelihood ratio; maximum likelihood channel estimation; minimum mean square error methods; vertical Bell Lab Space Time detectors; Channel estimation; Degradation; Detectors; Estimation error; Filters; MIMO; Maximum likelihood detection; Maximum likelihood estimation; Mean square error methods; System performance; MMSE, V-BLAST, channel estimation, channel correlation;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2009.080848

Filename

4783772