Simultaneous wide-band four-antenna wireless channel-sounding measurementsat 1920 MHz in a suburban environment

Simultaneous four-antenna wide-band mobile channel-sounding measurements we re made in two areas at 1920 MHz. The received signal strength and transmis sion loss were examined, Path-loss exponents for the two sectors were found to be 4.9 and 4,1. Root mean square delay spreads for the two sectors were found to be less than 1.38 and 0.65 mus for 90% of the data and less than 3.14 and 1.35 mus for 99% of the data, Fast fading reduction using antenna diversity and increased channel bandwidth (19.6 kHz, 1.25 MHz, 5.0 MHz, and 10.0 MHz) were examined. Three signal combining methods were considered: s election diversity, equal gain combining, and maximal ratio combining. The measured results show that increasing the number of diversity antennas or t he channel bandwidth significantly reduces fading, Maximal ratio combining yields the largest diversity gain, exceeding 11.0 and 17.0 dB at the 90% an d 99% fast fade depth probability levels, respectively, for the 19,6-kHz na rrow-band signal and 6.7 and 6.9 dB for the 10.0-MHz broad-band signal when all four channels are used.