2-Step QRM-MLBD for Broadband Single-Carrier Transmission

Katsuhiro TEMMA  Tetsuya YAMAMOTO  Kyesan LEE  Fumiyuki ADACHI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E95-B   No.4   pp.1366-1374
Publication Date: 2012/04/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.1366
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
Keyword: 
single-carrier,  QR decomposition,  M-algorithm,  MMSE-FDE,  

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Summary: 
Maximum likelihood block signal detection employing QR decomposition and M-algorithm (QRM-MLBD) can significantly improve the bit error rate (BER) performance of single-carrier (SC) transmission while significantly reducing the computational complexity compared to maximum likelihood detection (MLD). However, its computational complexity is still high. In this paper, we propose the computationally efficient 2-step QRM-MLBD. Compared to conventional QRM-MLBD, the number of symbol candidates can be reduced by using preliminary decision made by minimum mean square error based frequency-domain equalization (MMSE-FDE). The BER performance achievable by 2-step QRM-MLBD is evaluated by computer simulation. It is shown that it can significantly reduce the computational complexity while achieving almost the same BER performance as the conventional QRM-MLBD.