Abstract:

In a wireless channel, the signal which sent from source to destination is effected by fading. The signal arrives to the destination over different wireless channels and every channel has different characteristics. This situation leads performance loss on the system. There are different models to combat fading effects and spatial diversity is one of them. In diversity technique, copies of original signal sent to destination over different paths by different antennas. After reception phase, receiver combines all of the incoming signals and this combination process improves the performance of the system. Cooperative networks includes at least one source, one relay and one destination, thus they have spatial diversity effect on the system. In this paper, we investigate the performance of a one source, one relay and one destination wireless cooperative network with different combiners. It is obvious from the results that, Equal Ratio Combiner is the simplest combiner and it performs worse than other combiners. Signal to Noise Ratio Combiner uses SNR values of the signal to combine the signals and it has the best performance. But, SNR combiner has comparatively computational complexity disadvantage.

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