干扰与噪声条件下无线通信系统的链路预算

摘要

无线通信系统工作在外部噪声干扰和热噪声综合效应下时，目前常用的链路预算方法往往存在精确性不足的问题，表现在考虑外部噪声干扰时忽略热噪声，或者在考虑热噪声时忽略外部噪声干扰。当热噪声与外部噪声干扰接收功率接近时，该方法得到的结果与现实就有较大差距。针对上述问题，通过对常用链路预算表达式的修正，提出了同时考虑外部噪声干扰和热噪声综合效应的统一的链路预算表达形式。仿真结果表明，修正后的链路预算表达式如实地反映了热噪声和外部噪声干扰的综合效应。%When the synthetic effect of external noise jamming and thermal noise are considered in the wireless communication system,the usual method of link budget is sometimes not very accurate because the thermal noise is ignored when considering the external noise jamming,or the external noise jamming is ignored when considering the thermal noise.If the thermal noise effect is close to the external noise jamming,a large difference will exist between the reality and the results obtained by this method.To address these problems,this paper proposes the modified link budget expression under the synthetic effect of noise jamming and thermal noise. Simulation results show that the modified expression is exactly reflects the synthetic effect of noise jamming and thermal noise.