16QAM调制和解调，中间经过高频调制，采用均衡接收,信道为加性高斯白噪声-16QAM modulation and demodulation, then modulate the signal to the high frequence before translated onto the channel

这是一个对语音信号(0.3kHz~3.4kHz)进行低通滤波的C语言程序， 低通滤波的截止频率为800Hz，滤波器采用19点的有限冲击响应FIR滤波。 语音信号的采样频率为8kHz，每个语音样值按16位整型数存放在insp.dat文件中。-This c program is a low pass filter for radio signal 0.3kHz-3.4kHz.The stop frequence of this filter is 800hz.This digtal filter c

移动通信中QPSK调制在8,Multipath Rayleigh Fading Channel下的传播特性分析（包括Impulse Response/frequence Response/phase trajectory/multipath components/multipath gain/Doppler spectrum等参数指标）-Mobile communications QPSK modulation in 8, Multipath Rayleigh Fading Channel

该程序为一子程序，主要用来产生北斗（beidou）B1I 频点信号的PRN码，使用时在主程序里面调用，输入卫星编号即可-This is a sub programme,used for generating the PRN codes of BEIDOU B1 frequence.When you use it,you should type in the satellite IDs in the main programme.

一个二进制的伪随机序列扩频，采用的是跳频扩频(hop frequence spread spectrum)