Frequency-domain Multi-stage Inter-code Interference Cancellation for Multi-code DSSS Transmission
نویسندگان
چکیده
Frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion can replace rake combining with much improved bit error rate (BER) performance of the multi-code direct sequence spread spectrum (DSSS) signal transmission in a severe frequency-selective fading channel. However, since the channel cannot be completely equalized, the residual inter-code interference (ICI) is present and therefore, the BER performance degrades as the number of parallel codes increases. In this paper, we propose frequencydomain multi-stage parallel interference cancellation (FD-MSPIC). In FD-MS-PIC, interference replica is generated and subtracted from the received signal in the frequency-domain and then, MMSE-FDE is carried out. The achievable BER performance is evaluated by computer simulation. Keywords-component; Direct sequence spread spectrum (DSSS), Frequency-domain equalization (FDE), ICI, PIC
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