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中文摘要：
提出一种联合网络编码和叠加编码的协作发射策略。对传统的解码转发中继采用网络编码可以提高频谱效率，这是因为放宽了不同数据流之间的正交约束并且可通过预编码／波束形成技术减轻由此带来的干扰。与基于信道状态信息获得近似最优性能但计算繁重的波束形成策略相比，提出利用叠加编码思想确定网络预编码处理向量，该方法无需发射端预知CSI因而大大减小了计算复杂度。理论分析和仿真结果同时表明，所提策略可获得与基于CSI近似最优的线性网络预编码和脏纸网络预编码策略极为相近的性能。
英文摘要：
A joint network coding （NC） and superposition coding scheme was proposed to realize a cooperative transmission. The use of NC was able to improve spectral efficiency over classical decode and forward relaying strategy by relaxing the orthogonality constraint between diffe.rent data streams and mitigating the resultant interference through precoding. In contrast to using the CSI based beamforming scheme which could achieve near optimal performance but involves huge computational complexity, designing the beamforming vector using the form of superposition coding was proposed, such that CSI at the transmitters were not required and the involved computation was greatly reduced. The theoretical analysis and simulation results reveal that the proposed scheme shows performances close to the near-optimal CSIT based scheme.
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