多用户Z高斯干扰信道可达速率

Achievable Rate of Multi-user Gaussian Z Interference Channel

为了进一步研究Han-Kobayashi(HK)传输策略在多用户Z高斯干扰信道上的性能,在中等弱干扰条件下构造了多用户Z高斯干扰信道可达速率内、外界.通过将信息分割为公有信息和私有信息,优化每个用户的公有信息和私有信息之间的比例,得出一条多用户Z高斯干扰信道速率RHK;通过增加级联Z高斯干扰信道的约束条件得出了一条小于RHK的速率內界;利用精灵辅助方案,得出了大于RHK的两条速率外界.通过计算速率内、外界之差得出:在中等干扰下,利用HK策略所得到的速率距离信道容量小于1 bit·s-1·Hz-1;在弱干扰下,随着总用户数量的增加,利用HK策略所得到的速率RHK与信道容量之间距离逐渐逼近1 bit·s-1·Hz-1.

In order to further study the communication scheme of Han-Kobayashi（HK） on cascade Gaussian Z interference channel,a method of one inner bound and two outer bounds was proposed under weak and medium interference. In the scheme,as the transmitted information of both users split into common information and private information,a achieve rate RHKis obtained by optimizing the ratio between common and private information. An inner bound is proposed by adding a constraint on this channel which is less than RHK. Based on two genie-aided programs of two-user interference channel,two outer bounds were proposed by genie-aided which great than RHK. By analyzing the distance between the inner bound and outer bounds,HK type scheme can be achieved within a single bit per second per hertz（bit·s^-1·Hz^-1） of the capacity under medium interference and approach to a single bit per second per hertz（bit·s^-1·Hz^-1） of the capacity under weak interference as total number increasing.