【摘要】 传统跳频多址信道接收系统接收的调频信号数量少,误码率高。针对这一问题,基于分数阶半正交多小波技术设计了一种新的跳频多址信道接收系统。构建了系统硬件的A/D电路和D/A电路,重点设计了接收单元,由A/D转换器、低通滤波器、相位测量和NCD组成。根据硬件建立软件流程图,分为读取固定门限比较值、判断是否为高、启动计时器、将4个采样值平均后输出给D/A、读取计时器、判断是否达到150 ns以及接收信号7步组成。设计实验与传统接收系统进行对比,结果表明,在多载波跳频系统的总带宽一定时,基于分数阶半正交多小波接收系统接收到的跳频点数要多于传统系统,误码率低于传统系统,接收能力更强,利用价值更高。更多还原

【Abstract】 Since the conventional frequency hopping multi-access channel receiving system can only receive a small number of frequency modulated signals and has a high error rate,a new frequency hopping multi-access channel receiving system is designed on the basis of fractional-order semi-orthogonal multi-wavelet technology. The A/D circuit and D/A circuit of the system hardware are constructed. The receiving unit is designed emphatically,which is composed of A/D converter,low pass filter,phase measurement device and NCD. The software flow chart is established according to the hardware,in which there are seven steps,named fixed threshold comparison value reading,high value judgement,timer starting,averaged sample value outputting to D/A,timer reading,judging whether it reaches 150 ns,and receiving the signal. The experiment verification was carried out.The results show that,in comparison with the traditional receiving system,the fractional-order semi-orthogonal multi-wavelet receiving system can receive more frequency hopping points,its bit error rate is lower,and its receiving capacity is powerful under the condition that the total bandwidth of the multi-carrier frequency hopping system is fixed.更多还原