无碰撞区准同步跳频通信系统多址干扰性能分析

基于跳频通信边缘效应的多址干扰性能分析模型,即四碰撞态Markov过程模型,本文分析了基于新型无碰撞区(NHZ)跳频序列的准同步跳频通信系统用户干扰性能。当准同步跳频系统组网时工作在NHZ跳频序列集的无碰撞区内时,用户的载波频率表现为无碰撞状态;而在无碰撞区边缘的碰撞状态则可视具体情况分为无碰撞或左碰撞或右碰撞状态;对于无碰撞区外的碰撞状态则为无碰撞或左碰撞或右碰撞或左右都碰撞的状态。据此本文分析了无碰撞区准同步跳频通信系统的载波频率碰撞状态序列的特性,并提出适合无碰撞区准同步跳频通信系统的用户干扰性能分析模型。分析和数值结果表明,采用NHZ跳频码的准同步跳频通信系统的多址干扰性能优于采用随机跳频码的异步通信系统。

On the MAI Performance of the No-hit-zone Quasi-synchronous Frequency-hopping Communication Systems

On the basis of the four hit states Markov model which takes into account the marginal effect of the multiple access interferences(MAI) in frequency-hopping communication systems,this paper analyses the multiple access interferences of the zero hit zone(NHZ) quasi-synchronous frequency-hopping systems.When the quasi-synchronous FH system works within the zero hit zone of the NHZ FH sequences,there will be no hit at all,i.e.,in the no-hit state;when working at the edge of the no-hit-zone,the system may be in the no-hit state,or left-hit state,or right-hit state,depending on the specific situations;when working outside the no-hit-zone,however,the system may be in one of the following four states,i.e.,the no-hit state,left-hit state,right-hit state,or state of double-hits on both sides.This paper presents a new model that is appropriate for the NHZ quasi-synchronous frequency-hopping communication systems.Analysis and computation show that the MAI performance of the NHZ quasi-synchronous system using the NHZ sequences outperforms the asynchronous system employing random hopping frequency sequences.