Performance Comparison of Overlap FDE and Sliding-Window Chip Equalization for Multi-Code DS-CDMA in a Frequency-Selective Fading Channel

Tatsunori OBARA
Kyesan LEE
Fumiyuki ADACHI

IEICE TRANSACTIONS on Communications   Vol.E94-B    No.3    pp.750-757
Publication Date: 2011/03/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.750
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
overlap FDE,  sliding-window chip equalization (SWCE),  DS-CDMA,  

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Recently, overlap frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion which requires no guard interval (GI) insertion was proposed for signal transmission using multi-code direct sequence code division multiple access (DS-CDMA) in a frequency-selective fading channel. Another promising equalization technique is time-domain sliding-window chip equalization (SWCE). In this paper, the bit error rate (BER) performances achievable with overlap FDE and SWCE are compared. It is shown that, by extending the fast Fourier transform (FFT) block size, overlap FDE can achieve almost the same BER performance as SWCE with much less computational complexity than SWCE.