Performance of asymmetric antenna configurations in polarized channels

Small receivers can use dual polarization antennas to maximize received energy from single polarization transmitters. This paper analyzes the performance of these asymmetric MIMO antenna configurations in polarized, uncorrelated Rayleigh fading channels. Because the receiver can have knowledge of the channel´s cross polar ratio, a polarization reciprocity scheme is developed. This is shown to maximize signal energy at the uplink receiver for all polarized channels. Simulations then show the symbol error probability and relationships to the channel cross-polar ratio and the number of transmitting antennas. Also, the use of Alamouti coding in a dual polarization uplink and in combination with the polarization reciprocity scheme is analyzed.