Efficient use of pilot signals in wideband CDMA array-receivers
Sofiène Affes, Nema Mohamed Kandil, Paul G. Mermelstein · 2004
We extend application a new scheme for efficient use of pilot signals in wideband CDMA array-receivers from the pilot-channel to the pilot-symbol case. The new scheme exploits the pilot signals for the simple resolution of the sign ambiguity arising in BPSK-decision-directed blind channel identification and achieves significant spectrum efficiency gains and power or overhead savings over the same array-receiver versions, which use pilots for conventional channel identification only. Both analysis and simulations suggest that pilot channel and pilot-symbol array-receiver versions, either with conventional or new pilot use, have similar performance at weak Doppler. They also indicate increasing performance gains with increasing Doppler due to the improved use of the pilot information. For a data rate of 144 Kbps with 60 Kmph speed, simulations indicate efficiently gains due to new pilot use of about 25 and 70% in the pilot-channel and pilot-symbol cases, respectively.