A Study on the Channel and Signal Cross Correlation of UHF DTV Channels

UHF channels are traditionally used for television broadcasting where the channels can be regarded static or slowly-varying. Since the advent of the unlicensed and cognitive radio, there is a need of re-evaluation the channels in UHF frequency band under the new application environments. In this paper, new results on the temporal and spatial characteristics of the wideband UHF mobile wireless signals and channels in the digital television (DTV) broadcasting UHF frequency bands are presented. Our analysis of DTV mobile field measurements shows that the complex channel correlation magnitude depends on the channel phase correlation and is considerably different from the channel envelope correlation. Furthermore, the transmitted signal autocorrelation is embedded in the received signal correlation and makes it different from the channel correlation.