Main Article Content
Abstract
Multiple_Input Multiple_Output (MIMO) system is a new antenna technology in wireless communications. It has several antennas in both transmitting and receiving end and it is a frequency selective for multiple path characteristics. Orthogonal Frequency Division Multiplexing (OFDM) is used to get high data rate in wireless communication systems. Combination of MIMO and OFDM system used for converting the frequency selective channels into a parallel combination of frequency flat sub channels. Due to the atmospheric conditions some noises such as AWGN are added in the channels. Due to this the system performance will be degraded.To enhancing the reliabilityfor MIMO-OFDM system uses STBC scheme. Here to minimize the BER , allocating the power at transmitting antennas using Particle Swarm Optimization (PSO) algorithm.The power allocation and pilot tones optimization is mainly depends on the diagonal matrix from the QR decomposition.The system performance of the proposed method is analyzed in terms of bit error rate.