Relaxed look-ahead technique for pipelined implementation of adaptive multiple-antenna CDMA mobile receivers

In this paper, Relaxed Look-Ahead technique for pipelined implementation of an adaptive Direct-Sequence Code Division Multiple Access receiver is proposed when multiple antennas are utilized for mobile communications. Adaptive multiple-antenna receivers can provide insensitivity to the interfering powers. They also provide room for more users or require smaller number of antennas than the matched filter solution. A number of approximation techniques are utilized to pipeline the adaptive algorithm used for the proposed multiple-antenna receiver. The resulting pipelined receiver achieves a higher throughput or requires lower power as compared to the receiver using the serial algorithm. With the aid of simulations, for different levels of pipelining and different number of antennas, the signal-to-interference ratio and the bit error rate versus the relative interfering power are illustrated.