Title :
Uplink single-carrier frequency division multiple access system with joint equalisation and carrier frequency offsets compensation
Author :
Al-kamali, Faisal ; Dessouky, Moawed ; Sallam, B.M. ; Shawki, F. ; Abd El-Samie, F.E.
Author_Institution :
Dept. of Electron. & Electr. Commun., Menoufia Univ., Menouf, Egypt
fDate :
3/1/2011 12:00:00 AM
Abstract :
Similar to the orthogonal frequency division multiple access (OFDMA) system, the single-carrier frequency division multiple access (SC-FDMA) system also suffers from frequency mismatches between the transmitter and the receiver. As a result, in this system, the carrier frequency offsets (CFOs) disrupt the orthogonality between subcarriers and give rise to inter-carrier interference (ICI) and multiple access interference (MAI) among users. The authors present a new minimum mean square error (MMSE) equaliser, which jointly performs equalisation and carrier frequency offsets (CFOs) compensation. The mathematical expression of this equaliser has been derived taking into account the MAI and the channel noise. A low complexity implementation of the proposed equalisation scheme using a banded matrix approximation is presented here. From the obtained simulation results, the proposed equalisation scheme is able to enhance the performance of the SC-FDMA system, even in the presence of estimation errors.
Keywords :
equalisers; frequency division multiple access; intercarrier interference; least mean squares methods; wireless channels; OFDMA system; SC-FDMA system; banded matrix approximation; carrier frequency offsets compensation; channel noise; estimation errors; frequency mismatches; inter-carrier interference; joint equalisation; low complexity implementation; minimum mean square error equaliser; multiple access interference; orthogonal frequency division multiple access system; uplink single-carrier frequency division multiple access system;
Journal_Title :
Communications, IET
DOI :
10.1049/iet-com.2010.0135