接收功率受限下的信道容量研究  

Research on Channel Capacity under Received-power Constraint Condition

作　　者：吴少琴[1] 

机构地区：[1]南京理工大学电子工程与光电技术学院,南京210094

出　　处：《电讯技术》2012年第1期86-90,共5页Telecommunication Engineering

摘　　要：基于频谱共享模型,应用拉格朗日极值定理和注水算法,得出在频谱共享中接收功率受限的情况下对称信道感知和非对称信道感知下认知用户信道容量的关系式,并分析了主用户个数对认知用户信道容量的影响。仿真结果表明在相同平均信噪比下,瑞利衰落信道的信道容量最大,而信噪比越小差别越明显。Based on the spectrum sharing model and via the Lagrange maximum theory and injection method, the cognitive user channel capacity of the symmetric channel and asymmetric channel is calculated respectively under the condition that the received power is constrained. The influence of primary user number on the channel capacity is analysed. The simulation results show that Rayleigh fading channel has the most largest capacity under the same average signal - to - noise ratio（SNR）, while the difference will be more obvious when the SNR is smaller.

关 键 词：认知无线电 频谱共享 信道容量 接收功率受限 干扰温度 

分 类 号：TN915.9[电子电信—通信与信息系统]