Robust Feedback Design for Time Reversal UWB Communication Systems Under CSIT Imperfections

We propose a robust design for digital feedback of the channel impulse response in a time-reversal ultrawideband communication system. The proposed scheme employs channel optimized vector quantization to reduce distortion that occurs due to channel noise on the feedback link. Utilizing experimental channel measurements in a typical indoor environment, we indicate the robustness of the proposed strategy by showing that the scheme´s performance remains resilient under channel mismatch conditions that arise due to the combined effect of quantization, feedback delay, and noise on the feedback channel.