Nakagami-m衰落下AF部分中继选择系统性能研究

摘要

在放大转发中继系统中，基于Nakagami-m衰落场景，借助概率密度函数、累积分布函数和矩生成函数性能分析法，推导了部分中继选择策略下协作分集系统采用不同调制方式的平均错误符号概率（ASEP）闭合表达式，给出了该系统协作分集下的分集阶数，并指出了在这一场景下影响ASEP性能的因素。仿真结果表明，所得的闭合表达式与数值仿真结果有良好的吻合性能，尤其在中高信噪比区域，所提方案具有很好的渐近性能，并通过仿真曲线进一步验证了与所提命题的一致性。%In this paper, a closed-form asymptotic expressions for the average symbol error probability (ASEP) of amplify-and-forward (AF) cooperative systems over Nakagami-m fading scenario with partial relay selection are derived. Performance of probability density function (PDF), cumulative distribution function (CDF)and moment generating function (MGF)methods are studied. Based on these expressions, the diversity order is obtained and insightful conclusions are drawn. Numerical results are plotted and the asymptotic curves match very well in the medium and high signal-to-noise ratio (SNR) regions with those obtained by simulations.