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 is used to getting higher data rates in wireless communication systems. MIMO with OFDM system is used for converting the frequency selection 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. So the system performance will be degraded. To enhance the reliability of the MIMO-OFDM system uses STBC scheme. Here to minimize the BER by allocating the power at transmitter using Particle-Swarm-Optimization (PSO) algorithm. The allocation of power at transmitting end and pilot tones optimization mainly depends on the diagonal matrix which is from the QR-decomposition of the channel matrix. The system performances of the proposed method are analyzed in terms of bit error rate and signal to noise ratio.
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