Wide-band measurement and analysis techniques for the mobile radio channel

The appearance of high bit rate digital radio systems would appear to demand the existence of wide-band channel models, planning tools, and simulation capabilities. The authors present an overview of various approaches to wide-band channel data acquisition (channel sounding) and data analysis for the locally QWSSUS channel. They outline how high-speed digital signal processing techniques can be employed to construct a nearly ideal real-time wide-band channel sounder. The digital sounder described employs a TMS32050A to implement a matched filter type receiver. The probe signal is a carrier BPSK modulated with a binary maximal length sequence; the received signal is processed in real time, yielding a complex time variant channel impulse response. A dynamic range in excess of 40 dB is achieved. They also briefly discuss techniques to use this data for stored channel simulation. Finally, by way of pointing out that much more information can be extracted from channel sounding data than is generally appreciated, they briefly discuss the use of probability theory (Bayesian techniques) in model selection