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DS-CDMA HARQ with Overlap FDE Kazuki TAKEDA Hiromichi TOMEBA Kazuaki TAKEDA Fumiyuki ADACHI Publication IEICE TRANSACTIONS on Communications Vol.E90-B No.11 pp.3189-3196 Publication Date: 2007/11/01 Online ISSN: 1745-1345 DOI: 10.1093/ietcom/e90-b.11.3189 Print ISSN: 0916-8516 Type of Manuscript: PAPER Category: Wireless Communication Technologies Keyword: DS-CDMA, HARQ, overlap FDE, Full Text: PDF(472.9KB)>>
Summary: Turbo coded hybrid ARQ (HARQ) is known as one of the promising error control techniques for high speed wireless packet access. However, in a severe frequency-selective fading channel, the HARQ throughput performance significantly degrades for direct sequence code division multiple access (DS-CDMA) system using rake combining. This problem can be overcome by replacing the rake combining by the frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion. In a system with the conventional FDE, the guard interval (GI) is inserted to avoid the inter-block interference (IBI). The insertion of GI reduces the throughput. Recently, overlap FDE that requires no GI insertion was proposed. In this paper, we apply overlap FDE to HARQ and derive the MMSE-FDE weight for packet combining. Then, we evaluate the throughput performance of DS-CDMA HARQ with overlap FDE. We show that overlap FDE provides better throughput performance than both the rake combining and conventional FDE regardless of the degree of the channel frequency-selectivity. | |||||
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