Based on the variation characteristics of the probability density function of the harmonic mean of two statistically independent non-negative random variables at zero point, this paper analyzes the performance of the selective amplification and transmission cooperative protocol in Nakagami fading channels, and obtains a closed-form expression for the system symbol error rate at high signal-to-noise ratio. Theoretical analysis and numerical simulation results show that the selective amplification and transmission cooperative protocol can obtain the same diversity order as the traditional amplification and transmission cooperative protocol in Nakagami channels, and has better symbol error rate performance.
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