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Time-reversal (TR) is a beamforming technique for frequency-selectivechannels, which has received increasing attention due to its high energyefficiency and low computational complexity for wireless communications. Inthis paper, we present two contributions on time-reversal (TR) wirelessbeamforming for single-user indoor wideband MISO systems. First, we providenovel analyses of a baseband TR system using two commonly used indoorpropagation channel models. We derive closed-form approximations for theinter-symbol interference (ISI) with these channel models in order tocharacterize the influence of propagation conditions (such as the power-delayprofile, delay spread, and bandwidth) on TR performance metrics. In particular,we analyze spatial focusing and time compression performance of TR beamforming,and their impact on the bit error rate (BER). As a second contribution, weintroduce an equalized TR (ETR) technique that mitigates the ISI ofconventional TR. The proposed ETR utilizes a zero-forcing pre-equalizer at thetransmitter in a cascade configuration with the TR pre-filter. Unlike previousapproaches to ISI mitigation in TR systems, we derive theoretical performancebounds for ETR and show that it greatly enhances the BER performance ofconventional TR with minimal impact to its beamforming capabilities. By meansof numerical simulations, we verify our closed-form approximations and showthat the proposed ETR technique outperforms conventional TR with respect to theBER under any SNR.

Equalized Time Reversal Beamforming for Indoor Wireless Communications