Optimal Diversity Position over Time-Varying Rayleigh Channel with Spatial Interpolation

Doppler spread is particularly detrimental to wireless communication performance especially for transmitting a long packet. In this case, the packet experiences rapidly varying fading compared with transmitting over the static channel. To deal with this problem, the uniform linear antenna (ULA) was proposed to compensate Doppler spread. The ULA consists of a linear antenna array which can be used as space samplers to estimate a virtual point that does not move during packet transmission but without the diversity gain. In this paper, we propose the optimal time diversity position with the ULA compensator over the time-varying Rayleigh fading channel. During transmission, this scheme not only can keep the channel quasi-static but also achieve the optimal time diversity by setting the virtual diversity receiving points at zeros of the time autocorrelation function. When combined with the orthogonal space time block code (STBC), it is proved that this scheme performs even better than that over the static channel with Monte Carlo simulation.