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完整的OFDM链路程序并作了较为具体的解析从基本的bpsk,qpsk,qam到实际的ofdm系统,cdma链路,mac层仿真分析.,Orthogonal frequency division multiplexing (OFDM) is becoming the chosen
modulation technique for wireless communications. OFDM can provide large data
rates with sufficient robustnes
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一、 本程序采用16QAM调制方式,对一串2进制信源进行调制,采用(7,4)循环码对信源做信道编码,用升余弦滚降函数进行基带调制,再调到高频信道;在信道上加入高斯白噪声,运用匹配滤波器解调,画出解调星座图,运用最小欧氏距离译码判决,再对信号进行信道解码,画出采用信道编码技术和不采用信道编码技术的误比特率图。-First, this program uses 16QAM modulation mode, for a string of two binary source is modulated,
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bpsk-binary phse shift keying,fsk-frequency shift keying,hamming code,pcm-pulse coded modulation,dpsk-differential phase shift keying
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脉冲编码调制(PCM)实现
编程实现PCM技术的三个过程:采样、量化与编码。
采样:低通连续信号采样,以 x=sin(200*t) m=x./(200*t) m=m.*m 为例说明低通采样定理,绘出信号时、频图形;带通连续信号采样,以x=sin(20*t) m=x./t 为例说明带通采样定理,绘出信号时、频图形。
量化:均匀量化,以幅度 的正弦信号为例实现为64级电平的均匀量化;非均匀量化,输入A律PCM编码器的正弦信号 ,采样序列为 ,将其进行PCM编码,给出编码器的输出码组序列
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由MATLAB程序产生2Gbi/s的基带OFDM信号先将2^15-1个伪随机序列映射到256个进行4QAM编码调制的子载波上,编码后的OFDM符号再经过IFFT变换将其转换为时域波形,接着添加6.4ns的循环前缀(CP),产生的数据波形再装载到Tektronix任意波形发生器(AWG)中,产生2Gbit/s的基带OFDM信号。基带OFDM信号频谱示意图如图3所示。其中包括256个OFDM子载波256个子载波中200个子信道用来传送数据信号,27个高频和28个低频子信道为了过采样的需要置0,OFD
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2FSK仿真演示系统,可以任意输入码字序列,和载波频率,动态产生调制波形。可以清楚的看到整个调制解调过程的时域及频域的波形。-Simulation demo system 2FSK, can enter the code word sequence, and the carrier frequency, modulation waveform is dynamically generated. Can clearly see the time domain and frequency domai
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AM MODULATION: It is matlab code for AM,DSBSC,SS B with carrier ,ISB, & multitone AM & their spectrum. AM is a technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. AM works by varying the st
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Matlab file for simulating a cyclic-prefix (CP) orthogonal-frequency-division-multiplexing (OFDM) system with binary phase-shift keying (BPSK) modulation on each subcarrier. CP-OFDM system includes a repetition code and interleaving across subcarrie
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orthoganal frequency division multeplexing modulation
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时频调制,抗多径干扰,MATLAB源代码,实测可用。-Time-frequency modulation, anti-multipath interference, MATLAB source code, measured available.
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通过两个例子,将Optisystem和matlab这两个软件结合进行光学仿真,两个例子分别为光波频率右移和光波幅度调制。通过这两个例子,能很好的理解这两个软件的协同仿真。上传的文件包括文献和源码,还有optisystem的osd文件,文件很全。(Two examples are used to combine the two software Optisystem and MATLAB for optical simulation. The two examples are the right
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MATLAB跳频仿真源代码,展示了整个跳频通信过程,包括信号源产生、2FSK调制、跳频扩频、跳频解调、2FSK解调、抽样判决、恢复原始信号过程,适合初学者(MATLAB frequency hopping simulation source code, showing the entire frequency hopping communication process, including signal source generation, 2FSK modulation, frequency
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