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扩展频谱通信系统是指待传输信息的频谱用某个特定的扩频函数扩展后成为宽频带信号,送入信道中传输,再利用一定手段将其压缩,从而获取传输信息的通信系统。
在传输同样信息时所需的射频带宽,远比我们已熟知的各种调制方式要求的带宽要宽得多。扩频带宽至少是信息带宽的几十至 几万倍。-spread spectrum communication systems refer to the transmission of information with a particular spectrum of spre
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一个四用户的扩频通信系统,扩频增益为N=16,采用Walsh码进行直接序列扩频,BPSK调制,无线信道为AWGN(加性高斯白噪声信道)信道(AWGN信道:不考虑通信信道信号时,由宽频范围描述的统计随机无线噪声。)。在接收端进行解扩,解调,判决,通过仿真得到其中一个用户的误比特率与信噪比的仿真结果。,A four-user spread spectrum communication system, spreading gain for N = 16, using Walsh code Direct
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802.11b 1Mbps PHY link.
This M code simulates DBPSK modulation and barker code spreading
on a perfectly synchonized 802.11b link. It calculates the BER
rate at each EsNo (EbNo) and plots the result- 802.11b 1Mbps PHY link.
This M code
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文件由两部分组成,直扩GMSK调制的matlab仿真程序和Verilog硬件程序。完成了对信号的扩频编码,GMSK调制,硬件程序中的高斯滤波器调用自matlab仿真产生。包括ds_gold_gmsk.m,mseq31.m,zhikuoGMSK.m以及d_encode.v,code_convert.v,frame.v,DS.v,gauss_filter.v,DS_GMSK_MD.v等编码,组帧,滤波,扩频,调制众多源码-Document consists of two parts, DSSS MS
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n the telecommunications, direct-sequence spread spectrum (DSSS) is a spread spectrum modulation technique. Spread spectrum systems are such that they transmit the message bearing signals using a bandwidth that is in excess of the bandwidth that is a
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