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Channel estimation error problem is among the main causes of performance degradation in wireless networks. In this paper, the authors investigate the impact of cooperative communications on mitigating the effect of channel estimation error. Two main performance criteria, namely, the traditional outage probability and the proposed Signal-to-Noise Ratio (SNR) gap ratio, are utilized to characterize such impact. The SNR gap ratio measures the reduction in the SNR due to channel estimation error. Taking into consideration the channel estimation error, they show that the outage probability is reduced by utilizing cooperative transmission. They also show that cooperative transmission results in lower SNR gap ratio compared to that of the direct transmission.
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