Pipelined adaptive CDMA mobile receivers
R. Baghaie, Stefan Werner · 1998
Adaptive multiple-antenna receivers can provide insensitivity to the interfering powers and room for more users or they require smaller number of antennas compared to the matched filter solution. In this paper, pipelined implementation of an adaptive DirectSequence Code Division Multiple Access receiver is proposed when multiple antennas are utilized for mobile communications. A number of approximation techniques are utilized to pipeline the Recursive Least-Squares (RLS) algorithm used for the receiver. The resulting pipelined structure achieves a higher throughput or requires lower power as compared to the receiver using the conventional serial RLS algorithm. As a result of pipelining, the hardware overhead is only 2M extra latches. For different number of antennas and different levels of pipelining the signal-to-interference versus the relative interfering power are illustrated.