Enhancing the performance of MIMO space time coding systems using a Rake receiver based on continuoues wavelet transform

摘要

A new maximum ratio combining (MRC) Wavelet Rake (WR) receiver is presented in this paper. The WR receiver makes use of the huge bandwidth accompanied with the Ultra-Wideband (UWB) system. The proposed WR receiver uses the continuous wavelet transform (CWT) of the transmitted pulse at different scales (frequency resolutions) as the Rake fingers template pulses. Where, the Rake fingers delays are the group delays equivalent to the template pulses center frequency. Thus, the WR does not only capture the signal energy in the different multipath components at different delays (in conventional Rake (CR)) but also at different frequency components too. The WR is presented with UWB single-input single-output (SISO) and multi-input multi-output (MIMO) with analog space time coding (STC) systems. Its performance is compared to these systems with the conventional MRC-Rake receiver and Genetic Algorithm (GA) Rake presented in [1] and showed a great enhancement in performance with less receiver complexity.