Pipelined implementation of adaptive multiple-antenna CDMA mobile receivers

Pipelined implementation of an adaptive direct-sequence code division multiple access (DS-CDMA) receiver is proposed when multiple antennas are utilized for mobile communications. Adaptive multiple-antenna receivers can provide insensitivity to the interfering powers and room for more users or require a 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 requires minimal hardware increase and achieves a higher throughput or requires lower power as compared to the receiver using the serial algorithm. Simulation results illustrate the signal-to-interference ratio (SIR) versus the relative interfering power for different number of antennas and different levels of pipelining