Turbo Equalization for DS-CDMA with Frequency-domain Equalization
نویسندگان
چکیده
Abstract In direct sequence code division multiple access (DS-CDMA), frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion can be applied to exploit the channel frequency-selectivity and therefore can replace the conventional rake combining with much improved bit error rate (BER) performance. However, the residual inter-chip interference (ICI) is present after MMSE-FDE and hence the achievable BER performance is degraded compared to the lower bound performance. We proposed a frequency-domain ICI cancellation that can significantly suppress the residual ICI. In this paper, we propose DS-CDMA turbo equalization in which frequency-domain ICI cancellation is incorporated into iterative turbo decoding. The achievable BER performance is evaluated by computer simulation. Keyword DS-CDMA, frequency-domain equalization, residual inter-chip interference, frequency-domain adaptive ICI canceller, turbo equalization
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