基于分集增益与能量增益的多用户分集性能研究

协作分集通过形成虚拟天线阵的方式可以有效降低无线信道衰落特性对系统性能的影响，当存在多个可用中继时，通常采用基于空时码的协作策略，该方法具有较高的实现复杂度。为了使系统容易实现，机会分集技术成为近来研究的热点，本文基于分集增益与能量增益对机会分集技术中的多用户分集做了研究，并与相同条件下基于空时码的协作策略作了性能比较。结果表明，多用户分集技术与基于空时码的协作策略具有相同的分集度，同时前者可以获得能量增益。

Performance Research of Multi-user Diversity Technologies Based on Diversity Gain and Energy Gain

Cooperative diversity can decrease the influence of channel fading to improve system performance effectively, when there are a lot of relays,the cooperative policy usually based STC which has high complexity.For simplicity of realization,opportunistic diversity technologies become the research hotspot.In this paper,the performance of multi- user diversity technologies is researched based on diversity gains and energy gains,and compared with the cooperative policy based on STC under the same condition.Results show that multi-user diversity technologies and cooperative pol- icy based STC have same diversity order,and the former can achieve the benefits of energy accumulation.