Dumb-to-perfect receiver throughput ratio maps of a time reversal wireless indoor system

Abstract

Time Reversal (TR) is a pre-filtering technique for Multiple Input Multiple Output (MIMO) wireless systems, which achieves optimum performance with a low complexity receiver such as the Dumb Receiver (DR) (a single tap receiver), when it is operated at low receive Signal to Noise Ratio (SNR). TR is thus an interesting candidate for green systems working at low receive SNRs. However, the probability to meet these optimality conditions, in a practical indoor deployment, is still unknown today. For the first time, we propose to evaluate a map of the ratio between the DR throughput and the Perfect Receiver (PR) throughput, i.e. the Dumb-to-Perfect Receiver Throughput Ratio (DPRTR), in a typical indoor deployment scenario. Contrary to previous works, our paper is based on system level simulations, enabling to collect statistical results, and is based on non-simplified analytical Post Receiver Signal-To-Interference and Noise Ratio (SINR) formulas, enabling to measure the exact distance from the optimum. The SINR formulas include exact inter-symbol and multi-stream interference terms. Based on simulations results, we show that a single access point with a power as low as 0dBm (as it could be expected in a green system) spread over a huge bandwidth of 100MHz, the DPRTR metric reaches at least 50%, in regions of the map around the transmitter, and achieves up to 100% in all other regions.