Skip to Main Content
In this study, we present an experimental study of the time reversal (TR) technique in a single-input single-output configuration over the frequency range of 2-12 GHz. Our TR implementation is demonstrated to have high accuracy by comparing experimental TR traces with theoretical traces computed from the measured channel response. A special emphasis of this work is to investigate the effectiveness of TR in typical line-of-sight (LOS) and non-line-of-sight (NLOS) indoor environments for omni-directional antennas. We discuss the effects of the channel multipath dispersion on the received responses in both time and frequency domains. "RMS delay spread" and "peak-to-average power ratio" are calculated as two basic parameters for impulse response and TR performance evaluations. Our study suggests that the effectiveness of TR is subject to a trade-off between competing effects - namely, compensation of spectral phase variation (which leads to compression) and aggravation of spectral amplitude structure (which opposes compression). TR appears to mitigate multipath dispersion in NLOS channels to a modest extent. However, in LOS scenarios the effectiveness of TR in compressing time spread associated with multipath delay appears to be very limited.
Vehicular Technology Conference (VTC Fall), 2011 IEEE
Date of Conference: 5-8 Sept. 2011