Space-Time Block Coded Maximum Ratio Transmission with Imperfect Channel Estimation

We consider a multi-input-multi-output system employing space-time block codes (STBC). Different from conventional approaches, the proposed transmitter linearly combines data together with estimation of channel state information, so that no channel estimation is needed at the receiver side when phase-shift keying (PSK) modulation is employed. The employed STBC defines the number of receive antennas while the number of transmit antennas can be arbitrary. We propose a system with maximum ratio transmission for generalized orthogonal STBC with imperfect channel estimation at the transmitter. Bit-error probability of the proposed system with PSK modulated system under independent, identically distributed Rayleigh fading channels is analyzed. The result is in an explicit closed-form which shows direct dependence on the channel estimation error.