UWB propagation measurement using spread spectrum channel sounding

We present a new approach for time domain measurements of ultra-wideband channels by using spread spectrum sounding. In this paper, this technique is investigated for non-line-of-sight omni-directional antennas over the frequency range of 3-11.5 GHz with ~15 m propagation distance. A special emphasis of our work is to assess the accuracy of our channel response measurements. In one scheme, accuracy of our method is studied by comparing channel responses obtained using different wideband waveforms including pseudo-random (PN) and chirp signals. The independently measured channel responses show correlation coefficient better than 0.99, which proves the excellent accuracy of our method. In another route, time reversal (TR) experiments have been carried out; the results are compared with TR simulations and show excellent agreement.