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SPACE TIME CODING FOR MIMO SYSTEMS

With space-time codes (STC) the same information is transmitted in appropriate manner simultaneously from different transmit antennas to obtain transmit diversity. The main idea of transmit diversity is that if a message is lost in a channel with probability p and we can transmit replicas of the message over n independent such channels, the loss probability becomes p. Using diversity, more reliability is given to the symbols which allows employing higher order constellation resulting in higher throughput.