点对点和叠加高斯码的高斯干扰信道容量比较

On the Capacity Bounds of Gaussian Interference Channels with Point-to-Point and Superposition Gaussian Codes

为了研究实际通信中存在干扰情况下如何选择合适的编码方案,针对两用户高斯干扰信道,比较了分别使用点对点高斯码和叠加高斯码时的最佳可达速率区域与和速率。结果表明:某用户要以最大用户速率,或者在强干扰或弱干扰下系统以最佳吞吐量通信,应使用点对点高斯码;在中等干扰情况下,信噪比越大,适合点对点高斯码的信道系数范围越大,信噪比越小,适合叠加高斯码的信道系数范围越大。

In this paper, the inner bounds and sum rates for the two-user Gaussian interference channel using point-to-pointGaussian codes and superposition Gaussian codes respectively were compared to study how to select the appropriate encoding schemein a real communication system with interference. Results show that point-to-point Gaussian codes should be adopted when any usercommunicates at its maximum rate or the system works at its maximum sum rate under strong or weak interference. Under moderate in-terference, the range of channel coefficients appropriate for point-to-point Gaussian codes is larger when the signal-to-noise ratio ishigher. At the same time, the range of channel coefficients appropriate for superposition Gaussian codes is larger when the signal-to-noise ratio is lower.