Cross-correlation characteristics of multi-link channel based on channel measurements at 3.7GHz

This paper presents cross-correlation characteristics of multi-link channels considering cooperative communication scenarios. We introduce the wideband multiple input multiple output (MIMO) relay channel sounding system to simultaneously measure multi-link channels at 3.7GHz frequency band. The outdoor channel measurement campaign has been performed by realization of two-link channels in residential environments of Korea. We define a signal model with an angle and a relative distance of mobile station. We analyze the cross-correlation characteristics of large-scale channel parameters in terms of delay spread and shadow fading based on measured results. The empirical cross-correlation characteristics show that each two channels are highly correlated when the angle of separation is low, and when the mobile station is away from both base station and relay station with the same distance.