基于干扰温度的超宽带通信信道容量研究

Research on Channel Capacity of UWB Communication Based on Interference Temperature

分析了认知无线电中干扰温度的原理,并将其思想应用于超宽带通信。给出了接收机处干扰温度的影响因素,即通信距离越远,超宽带系统的中心频率越高,接收机处干扰温度越低;LOS信道下干扰温度一般高于AWGN信道,NLOS信道下干扰温度则远低于AWGN信道。建立了超宽带系统与其它通信系统共存的多模终端模型,仿真分析得出,当多模终端处的干扰温度较低时,超宽带系统受其它通信系统干扰时信道容量损失较大;当其它通信系统的带宽较宽或接收功率较低时,受超宽带系统干扰时信道容量损失也较大。在保证其它通信系统性能的前提下,得出了超宽带系统的最佳干扰温度和最大信道容量。

The principle of interference temperature in cognitive radio is analyzed,and the method is used in UWB communication.The affecting factors of the interference temperature at the receiver in UWB communication are presented,that is,when the transmission distance is long and the central frequency is high,the interference temperature at the receiver is low;the interference temperature in LOS channel model is always higher than that in AWGN,and the interference temperature in NLOS channel model is much lower than that in AWGN.The model of a multi-mode terminal with both UWB and the other communication system is established.Simulation results show that when the interference temperature at the multi-mode terminal is low,the channel capacity loss of UWB system with the interference of the other communication system is great;and when the frequency bandwidth of the other communication system is wide and the received power is low,the channel capacity loss of the other communication system with the interference of UWB system is also great.In the premise of the performance guarantee of the other communication system,the best interference temperature and the maximal channel capacity of UWB system are obtained.