Wireless technologies like Wifi, WiMAX, and LTE are using Multiple input and multiple output(MIMO) communications that are playing important role in achieving high data rates for. Bit error rate is one of the important performance parameters in multipath channels for data communication.This research proposes a new method based on RS coding to improve the efficacy of an STBC MIMO System in reducing BER in MPSK and MQAM in Rayleigh, Rician and Nakagami channels. It is based on the error detection and correction properties intrinsic to RS coding processes. Binary data is coded using an RS encoder and the modulated signal STBC encoded and transmitted through Rayleigh, Rician and Nakagami channels. Signals received by two antennas are STBC decoded, demodulated, RS decoded and tested for BER. Results show lower BER rates for RS Coded systems as compared for uncoded systems for both MPSK and MQAM for all three channels. In addition, it was found that reduction in BER is greater for high SNR but deteriorates for low SNR. Furthermore, this research observed that RS coding gives 63% to 98% improvement in BER in the Rayleigh as compared to Rician and Nakagami channels. This research has been able to successfully incorporate the BER reducing properties of RS coding to further enhance the efficacy of an STBC MIMO system.
Wireless Communication using Multiple input and multiple output(MIMO) systems are achieving high data rates with increased diversity. This paper presents the performance analysis of half rate convolutionally coded 4x4, 4x3 and 4x2 STBC MIMO system concatenated with MQAM. System performance is analyzed for 4QAM, 8QAM and 16QAM in Rayleigh channel. It is observed that BER performance is better for 4x4 system as compared with other schemes. Results show that BER performances of employed coded 4x4 system is improved over uncoded system in Rayleigh channel.
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