单天线中继干扰信道的自由度研究
首发时间:2014-01-16
摘要:随着移动通信的迅速发展,频谱资源匮乏问题将日益明显。另一方面,4G通信将面临更加恶劣和复杂的时变信道环境,再加上移动设备的功率受限等客观条件的约束,阻碍着4G高速率数据传输的实现。于是,在功率和频谱受限,且信道条件越发恶劣的未来移动通信传输环境下,如何尽可能地提高频谱利用率、实现大容量传输将是4G研究和未来无线通信界需要解决的最基础性的难题。本文利用干扰对齐技术对引入单天线中继的干扰信道自由度的影响进行了分析,得到在有中继协作下,只需要较小的时延扩展可以达到很大的自由度。因此通过一个单天线中继的协助就可以大大化简传输机和发送机的结构,同时给出了三用户下的干扰对齐可行性预编码矩阵的构造,以及提出了一个在中继辅助下实现干扰对齐的快速算法。
For information in English, please click here
The Impact on Degree of Freedom With a Single-antenna Relay
Abstract:In this paper, we first investigate the problem of achieving the degree of freedom(DoF) of a 3-user multiple-input-multiple output (MIMO) interference channel with a single-antenna relay. The feasible solution of interference alignment needs infinite symbol extensions to approach the full DoF k/2. While it was proved relays can not increase the degree of freedom of MIMO interference channel, we find that we can exact achieve interference alignment of 3-user MIMO interference channel with only 2 time slot extensions, using a single antenna relay. It is said that adding a single-antenna relay can tremendous simplify the transmitter/receiver structure. Meanwhile, detailed practical solution is given based on the idea. What's more, we propose a novel fast interference alignment (IA) algorithm with the help of a single-antenna relay. Simulation results show that the proposed fast algorithm outperforms the existing traditional IA algorithms with fast convergence.
Keywords: Wireless communication interference alignment Degree of Freedom (DoF) channel capacity time slots extension
基金:
论文图表:
引用
No.****
同行评议
勘误表
单天线中继干扰信道的自由度研究
评论
全部评论0/1000