中文摘要：

针对回程容量有限的多点协作网络，提出了一种基于叠加编码改进的协作群用户译码算法。该算法的基本思想：在用户侧通过叠加编码将信息进行分层后发送，在节点侧进行多阶段的群用户译码，节点间通过回程链路交互部分译码结进行串行干扰抵消，从而实现回程链路容量有限约束下的上行多节点协作接收。仿真结果表明：所提算法能显著提升系统和速率，随着回程容量增加，算法逐渐逼近性能极限。

英文摘要：

This paper addresses the issue of coordinated multi-point network with limited backhaul capacity and proposes an enhanced cooperative-group decoding algorithm based on superposition coding. The general idea is that at the transmitters, user information is split into multilayers and then superposed together for transmission. At the receivers, the access points perform a multi-stage group decoding and then forward partial decoded results through backhauls for interference cancella- tion. In this way, cooperative reception is realized among the points with the constrained backhaul capacity. Simulation results show that the proposed algorithm significantly improves the system sum rate ; as the hackhaul capacity grows, the proposed algorithm has good asymptotic performance.