Y信道中改进的干扰消除方法

Improved interference cancellation method over Y channel

对于3个用户和1个中继节点的MIMO Y信道模型,提出了一种基于空时码以及码字空间对齐的干扰消除方法.为每个用户设计了具有Alamouti结构的空时码字.在多址阶段,对每对码字进行空间对齐预编码后分两个步骤发送给中继节点.在广播阶段,中继节点对译码得到的符号进行空时编码后分两个步骤发送给3个用户.多址阶段和广播阶段都占用了4个时隙并且都传输了24个独立的调制符号.与相同场景中已有方案相比,所提方案在保持相同传输速率的同时,极大地减少了反馈量.仿真结果显示,所提方案的可靠性与相同场景中已有方案非常接近.

An interference cancellation method based on space-time code and codeword space alignment was proposed for MIMO Y interference channel,which consists of three users and a relay.An alamouti-based space-time coded is designed for each user.Codewords after space alignment pre-coding are sent to the relay in two steps during the multi access stage.The symbols estimated at the relay are encoded and are sent to three users in two steps during the broadcast stage.Both the multi access stage and the broadcast stage occupy four time slots,in which 24 independent modulated symbols are transmitted.Compared with the existing scheme for the same scene,the proposed scheme greatly reduces the amount of feedback,while keeping the same transmission rate.Simulation results demonstrate that the reliability of the proposed scheme is very close to that of the existing scheme for the same scene.