MCMC Sampling Based Signal Detection in Multiuser Load Modulated Arrays

摘要

Load modulated arrays (LMAs) is getting recent research attention as an attractive multiantenna transmission architecture in wireless communications. LMAs use a single power amplifier to drive the entire transmit antenna array and implement the multidimensional signaling constellation in the analog domain. In this paper, we consider LMAs in a multiuser setting on the uplink. In this setting, multiple user terminals, each using an LMA (e.g., with 2 or 4 antenna elements), communicate with a base station (BS) with multiple (tens to hundreds) receive antennas. For this system, we consider the problem of low-complexity signal detection at the BS receiver. Specifically, we propose a Markov Chain Monte Carlo (MCMC) sampling based detection algorithm. We evaluate the bit error rate performance of the algorithm via numerical simulations. Simulation results show that the proposed detection achieves very good performance, while also scaling well in complexity.