基于自适应多门限的基函数生成算法

Algorithm for Base Function Generation Based on Adaptive Multi-threshold

变换域通信系统(TDCS)具有对环境感知的能力,可以躲避干扰,具有优异的抗干扰性能。基函数生成算法是TDCS的核心算法。通过分析现有基函数生成算法存在的问题,提出了一种采用自适应多门限的基函数生成算法。该算法在传统二元判决的基础上,引入多元结构,对传统判决结果进一步细化,更加准确地反映了信道质量差别。理论分析表明,采用本文所提出的基函数生成算法产生的基函数,能够较好地克服传统门限估计算法对于信道环境自适应性不强等缺点,并且算法的门限设计简单,获得了较好的干扰抑制性能。

With the ability of sensing the electromagnetic environment, the Transform Domain Communication System （TDCS） can avoid jamming, with an excellent performance of anti-jamming. The base function generation is the core in the algorithms of TDCS. After an analysis od shortcomings of existing algorithms for base function generation, an algorithm of using adaptive multi-threshold in the base function generation is proposed in the paper for the TDCS. The algorithm uses a multi-structure, making the traditional adjudicate resuh more refined to reflect the difference of channel quality more accurately, based on the traditional binary adjudicate. The theoretical analysis shows that the algorithm of generating base functions based on adaptive multi-threshold can overcome the shortcoming of the traditional threshold estimation algorithm of bad adaptability with respect to channel circumstance. And the threshold design of the algorithm is simple, with good interference suppression performance.