Adaptive array processing and partial MAI cancellation technique for the uplink of time-multiplexed pilot bits CDMA system
Gong Ya-huan · Journal of China Institute of Communications · 2001
A space-temporal interference cancellation scheme is proposed which includes the pilot bits assisted LMS-DRMTA algorithm followed by partial multiple access interference(MAI) cancellation to cancel the MAI of the uplink of time multiplexed pilot bits CDMA system. Because of the interference cancellation effect of adaptive array, there are only very few strong MAI signals which must have very close DOA to the desired signal left in the array output. Therefore, the proposed scheme only estimates the strong MAI signals and cancels them from the array processing output. The new scheme is characterized by the following items: First, it cuts down the system complexity and buffering memory. Second, it avoids the degrade of system performance because of inaccurate estimation of the weak MAX signals. Third, it has more robustness than the adaptive parallel interference cancella- tion(PIC) .The simulations indicate that the new scheme performs much better than the adaptive PIC for all of the MAI signals.