Channel Estimation on the Bases of Multiuser Space Time Coding

In wireless transmission the randomness of the communication channel leads to random fluctuation in the received signal. This fluctuation known as fading. The fading is a fundamental problem in wireless communications because of this fading effect the authors cannot get exact signal at the receiver side. So to improve the signal performance at the receiver side diversity technique is the best method. Diversity defined as the method of conveying information through multiple independent random fades. Diversity gain results multiple paths between base station and user terminal and coding gain results from how symbols are correlated across transmit antennas.