Author : Ch.Tidula 1
Date of Publication :15th September 2017
Abstract: The advances in wireless technology leads to the simultaneous growth in the field of communication by increasing the data speed with high accuracy .It is a very complex task to increase the requirements of a data rate. So in order to meet these requirements Multiple-Input-Multiple -Output (MIMO) system has been developed. The adaptive system is having the variable number of transmit and receive antennas. Adaptive MIMO system uses an adaption algorithm. The number of transmit and receive antennas will change depending on this algorithm and it uses an Orthogonal Space Time Block Codes (OSTBC). These codes help in improving accuracy and providing high data rates. This can be done by using the two techniques spatial diversity and spatial multiplexing. The frames present in the adaptive system will operate with either one, two or three or four transmit and receive antennas. The OSTBC encoder block will encode the information symbols from the QPSK modulator by using the Almouti code. The QPSK demodulator will demodulate the output of the OSTBC combiner. The frame error rate for three transmit and two receive antennas is 0.1999 at 10db and the frame error rate for four transmit and two receive antennas is 0.5107. From the above results it is observed that the three transmit and two receive antennasisbetter.
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