异构网络脏纸编码方案

A Dirty Paper Scheme of Heterogeneous Network

异构网络技术是一把"双刃剑"。一方面,引入低功率节点能够增加网络部署的灵活性;另一方面,部署低功率节点同样会引入大量潜在干扰源。合理的低功率节点部署方案和高效的无线资源管理是降低干扰,提高异构网络性能的关键。鉴于脏纸编码方案具有能够充分利用发射端信道信息消除干扰的特性,首先考虑异构网络宏微蜂窝干扰受限的场景,指出脏纸编码方案在异构网络Z信道干扰中的应用。其次指出传统的脏纸编码方案在互干扰双链路网络中,只能消除一条链路的干扰,无法使两条链路同时实现无干扰信道容量。因此,一种基于协作分集的脏纸编码方案被提出,使相互干扰的两条收发链路均能达到无干扰时的信道容量。最后,通过仿真对比验证脏纸编码方案在Z干扰信道和二元对称信道中的性能优势。

Heterogeneous network technology is a double blade sword. On one hand,more flexible network deployment is obtained by adding lower power nodes to homogeneous network. On the other hand,low power nodes are also interference sources. Thus,low power nodes deployment schemes and radio resource management are the key technologies for coordinating interference and enhancing performance in heterogeneous network. Dirty paper coding is a kind of effective interference coordination scheme with transmitter knowing the channel state information which is typical in heterogeneous network. Then,we suggest several Z interference scenarios in which dirty paper code can be applied to coordinate interference. However,dirty paper coding guarantees only one pair of transmitter-receiver channel capacity by sacrificing the other pair of transmitter-receiver link capacity. Hence,a cooperativedirty paper coding scheme is proposed to cancel interference in mutual-interference channel and achieve binary symmetric mutual-interference channel capacity without loss. Finally, performance gain of dirty paper coding scheme in Z interference scenarios and mutual-interference channel is verified by simulation.