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In this paper the performance of Space Time Codes (STC) has been analyzed. Use of multiple antennas is an emerging approach for recovering fading and reducing the bit error rate. Space diversity is introduced in space time codes. In Alamouti Space Time Code (STC) two transmit antennas are used that provide relatively better results than no coding approach. Alamouti uses a code matrix at transmitter and at receiver end it uses MLD and estimates the output signals. Space time block codes are with arbitrary number of antennas. It uses a huge code matrix at encoder and decodes using MLD. The performance of STBC is far better than Alamouti and has no match with no coding. The simulation of Alamouti, STBC and no coding is done in project. Space time codes works with the price of redundancy bits and extra antenna price. Future work could be continued in space time turbo trellis codes. [ABSTRACT FROM PUBLISHER]

In broad spectrum a channel refers as a transmission medium through which information is transmitted. In channel, when the signal is transmitted there is an accumulation of noise at the received signal. To eliminate this noise from the channel different estimation techniques are used such as training sequences-based estimation, blind channel estimation. These techniques have some drawbacks such as implementation, convergence and efficiency problems. To conquer the problems in existing channel estimation techniques, we use continuous particle swarm optimization soft version algorithm (CPSO) which is used to optimize the solution by improving the candidate solution with respect to some quality measure. [ABSTRACT FROM PUBLISHER]