AUTHORS: K. Sujatha, S. Varadarajan

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ABSTRACT: As wireless communication becomes more prevalent, the demand for higher data rates and uninterrupted connectivity is increasing. Future wireless systems are provisioned to be highly heterogeneous and interconnected. On one side, wireless adhoc networks are emerging for a wide range of new applications, on the other side, infrastructure based broadband wireless systems are expanding to provide increasing number of services with ubiquitous coverage. Space-time coding is a MIMO technique which is well known for its ability to combat fading, increased system performance and capacity. Space time coding uses specially designed code matrix which enhance overall system performance than single antenna systems. Furthermore cooperative communications can benefits single antenna systems with the benefits of MIMO systems. Conjunction of cooperative communication with space time coding can provide capabilities to mitigate fading with increased system performance to a single antenna system. With this motive this research work is focused towards the development of dual hop OSTBC scheme for non-regenerative (Amplify and Forward) and regenerative (Decode and Forward) relaying with receiver phase noise. To evaluate the system performance Rayleigh, Rician and Nakagami fading environments has been considered with the assumption that channel coherence time is greater than transmission period. The proposed system adapts Alamouti OSTBC architecture at relay end and uses BPSK, QPSK and QAM modulation techniques. Simulation has been carried out on MATLAB-2010a and performance evaluation is done on the basis of Bit Error Rate vs. Signal to Noise Ratio

KEYWORDS: STBC, AF Relay, DF Relay, Rayleigh fading channel, ZF, MMSE, MRC

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