Reducing Complexity Using Path Selection for Sequential Blind Beamforming for Wireless Communications

In this paper, a path selection technique based on power level detection is introduced to our previously proposed MRC-sequential blind beamforming method to reduce the receiver complexity. MRC-SBB mitigates the inter-symbol and intra-symbol interferences by recovering the signal and its integer and non-integer multiple replicas using jointly CMA, LMS and adaptive fractional time-delay-estimation filtering. While the resulting improvement using this method is proportional to the number of the detected paths and also the interpolation filters' complexity, targeting portable applications motivates us to propose a technique to reduce the power consumption while maintaining good performance. Thus, in this paper, a path selection technique based on the paths' power-level detection and digital filter dynamic activation is introduced to significantly reduce the power consumption of the hardware circuits. Simulations in different scenarios using path selection for MRC-SBB were carried out, and the obtained results validate the power consumption efficiency without sacrificing the BER performance.