Novel detection technique for DS-CDMA with frequency domain oversampling

Authors:
Liang Liu;Dingrong Shao;Yongliang Guan;Guoan Bi
Affiliations:
School of Electronic and Information Engineering, Beihang University, Beijing, China;School of Electronic and Information Engineering, Beihang University, Beijing, China;School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore;School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore
Venue:
ICICS'09 Proceedings of the 7th international conference on Information, communications and signal processing
Year:
2009

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Abstract

In synchronous DS-CDMA systems, multi-access interference (MAI) due to severe frequency-selective fading degrades the system performance. Based on the frequency domain oversampling (FDO) and minimum mean-square error (MMSE) principle, a novel linear per-user MMSE detector is proposed to approximately restore the orthogonality among the spreading sequences and suppress the MAI. Based on a discussion on the optimal MMSE detector, a low complexity diagonal MMSE detector is proposed with only a slight degradation in performance. It is shown by numerical results that the proposed detector obviously outperforms the conventional linear MMSE detector in severe MAI environment.