Bit Error Probability Analysis of Cooperative Relay Selection OFDM Systems Based on SNR Estimation
نویسنده
چکیده
Cooperative networking plays an important role in wireless adhoc and sensor networks, in which the information from the source to the destination is relayed by intermediate nodes. In this paper, we propose OFDM-based all subcarrier and per subcarrier basis relay selection schemes. The relay selection is based on average signal to noise ratio (SNR) estimation. Data aided (DA) preamble based MMSE estimator is employed for average SNR calculation. We consider rician fading channel i.e., line of sight (LOS) path exits between source and destination. Data aided (DA) preamble based MMSE estimator is employed for SNR calculation. The relative Bit error rate (BER) performance of both all subcarrier and per subcarrier basis relay selection schemes are derived and compared to conventional amplify and forward (AF) ,decode and forward (DF) relaying. The simulation results demonstrates that per subcarrier basis relay selection scheme gives better BER performance compared to all subcarrier basis relay selection scheme.
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