Title :
2-Step QRM-MLBD Using Detection Ordering for Single-Carrier Transmission
Author :
Temma, Katsuhiro ; Yamamoto, Tetsuya ; Adachi, Fumiyuki
Author_Institution :
Dept. of Electr. & Commun. Eng., Tohoku Univ., Sendai, Japan
Abstract :
2-step 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 reducing the computational complexity compared to maximum likelihood detection (MLD). In 2-step QRM-MLBD, unreliable symbol candidates are removed by performing minimum mean square error based frequency-domain equalization (MMSE-FDE) prior to QRM-MLBD. However, a large number M of surviving paths is still required in the M-algorithm to achieve a BER performance close to the matched filter (MF) bound. In this paper, to remedy this problem, we introduce a detection ordering to 2-step QRM-MLBD. We will show by computer simulation that the use of detection ordering can achieve the same BER performance as 2-step QRM-MLBD while reducing the computational complexity.
Keywords :
computational complexity; equalisers; error statistics; fading channels; frequency-domain analysis; least mean squares methods; matched filters; maximum likelihood detection; 2-step QRM-MLBD; 2-step maximum likelihood block signal detection; BER performance; M-algorithm; MF bound; MMSE-FDE; QR decomposition; SC transmission; bit error rate; computational complexity; computer simulation; detection ordering; frequency-domain equalization; frequency-selective fading channel; matched filter bound; minimum mean square error; single-carrier transmission; Bit error rate; Computational complexity; Frequency domain analysis; Modulation; Noise; Signal detection;
Conference_Titel :
Vehicular Technology Conference (VTC Spring), 2012 IEEE 75th
Conference_Location :
Yokohama
Print_ISBN :
978-1-4673-0989-9
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2012.6240210