Space and frequency diversity measurements of the 1.7 GHz indoor radio channel for portable data terminals and telephones

The practical diversity performances achievable inside a building at 1.75 GHz are compared for three techniques: two-branch space diversity, two-branch frequency diversity, and four-branch hybrid diversity. Results are based on data collected using a four-branch dual-frequency envelope receiver with two antennas and with a dual-frequency transmitter located in various rooms on one floor of a university building. Envelope cross-correlations are calculated and diversity gain using selection combining is measured for various frequency diversity spacings and antenna separations. The distributions of correlations and diversity gain at different locations are presented.<>