协作分集是克服无线系统中的多径衰落提高传输速率的有效手段。网络编码不但可以有效解决传输拥塞问题，而且它还可以降低系统的中断概率。本文对协作通信系统及其与网络编码的结合进行了研究。 首先，详细地阐述了网络编码的基本原理和技术，协作通信的原理和基本协议类型。 其次，本文将网络编码、信道编码和协作通信进行联合设计，研究了一种基于卷积码的网络编码协作通信系统，建立了系统模型，并且研究了该方案的译码算法。在加性高斯白噪声信道下，对上述系统的误码率进行了仿真分析。结果表明该系统的误码率性能得到了显著的提高。 最后，为了进一步提高协作分集度，本文提出了一种中继用户编码协作改进方案。通过增加分集路径将协作系统的分集增益提高到三阶。针对多用户的编码协作系统，提出了一种不同协作用户转发不同校验码段的多用户编码协作方案，研究了系统的中断概率，对协作系统的协作度和功率分配进行优化。仿真结果表明该方案在完全协作的情况下能够达到高阶分集，从而进一步提高了协作性能。

Cooperative diversity is an efficient method to suppress multipath fading in wireless system and improve transmission rate. Network coding is not only an effective solution to transport congestion but also an effective technology to improve network transmission, and reduce the outage probability of system. Cooperative communication system and the combination of cooperative communication and network coding are researched in this paper. Firstly, the basic principles and key technologies of network coding, the principle and basic protocol of collaborative communication are introduced. Secondly, by co-designing with network coding, channel coding and cooperative communication, this paper works out a network coding coordination communication system based on convolution code, and establishes a system model. Meanwhile it studies decoding algorithm of the program. In an additive white Gaussian noise channel, the bit error rate of these systems is simulated and analyzed.The results show that the BER performance of the system has been significantly improved. Finally, in order to further improve the collaboration diversity degrees, the paper proposes a cooperation improvement scheme based on relay users coding. It improves the diversity gain of the cooperative system to third-order by increasing diversity path. For multi-user coding collaboration system, this paper also proposes a multi-user coding collaboration scheme that different collaborative user forwarding of different checksum. This paper studies the interruption of the system probability, and optimizes the collaboration degrees and power distribution of collaboration system. The simulation results show that the program is able to achieve higher order diversity in full collaboration, so as to further enhance the collaboration performance.