Patent ID: 8488703

Claim:
A method for determining an appropriate combination of at least two MIMO transmission techniques for a radio downlink from a base station to a mobile station, the method comprising: using at least two antennas with at least two polarizations, wherein said appropriate combination is a combination of beamforming and at least one of polarization-time-coding, polarization-frequency-coding, closed-loop coherent combination of polarization beams and polarization multiplexing, and said appropriate combination is chosen dependent on radio conditions of the radio downlink and relative velocity in between the base station and the mobile station; wherein the appropriate combination includes: a combination of beamforming with polarization time coding when signal to noise plus interference ratio (SINR) is below an SINR threshold and a receiver is moving at a speed above a chosen threshold; a combination of beamforming and a closed loop transmit diversity technique when the SINR is below the SINR threshold and receiver velocity is below the chosen threshold; and a combination of beamforming and spatial multiplexing when the SINR is above the SINR threshold, without regard to receiver velocity.