HARQ Throughput Performance of DS-CDMA Using Frequency-Domain ICI Cancellation
نویسندگان
چکیده
The bit error rate (BER) performance of DS-CDMA in a frequency-selective fading channel can be significantly improved by the use of frequency-domain equalization (FDE). However, the presence of a residual inter-chip interference (ICI) after FDE distorts the orthogonality among the spreading codes and the BER performance of the multicode DS-CDMA degrades as the number of multiplex order increases. The use of frequency-domain ICI cancellation can significantly improve the BER performance with FDE. In this paper, we consider hybrid automatic repeat request (HARQ) with multicode DS-CDMA using frequency-domain ICI cancellation. It is shown by computer simulation that frequency-domain ICI cancellation can significantly improve the HARQ throughput performance and reduces the required Es/N0 by 4~6 dB for a throughput range of 1~1.7 bit/s/Hz when QPSK modulation and SF=256 are used. Keywords-DS-CDMA, frequency-domain equalization, ICI cancellation, HARQ
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