Comparison of Two Time Reversal Schemes using Circular UWB Measurements

Time reversal is a promising technique for the improvement of future telecommunication systems. It may increase throughput while reducing receiver complexity. A better understanding of this capability requires more investigation on measured channels. This study used circular array propagation measurements. These measurements are efficient to estimate space-time focusing characteristics simultaneously. Because the delay spread parameter is inappropriate, a new parameter is introduced to study time focusing. Focusing parameters of two time reversal schemes are investigated. Time reversal improves the data rate by a factor of three and increases the received power using the entire FCC bandwidth. The one-bit time reversal scheme improves space focusing but provides smaller gain on other focusing parameters. The trend is the same with smaller bandwidth, but the benefits are reduced. The optimal bandwidth should be close to 3 GHz.