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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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用matlab对基带数字系统进行仿真。整个系统描述了信号的发送和调制过程。其中调制采用16QAM,并且采用基带传输,不必调制到载频上。系统总采用了高斯信道,在接受端采用解调并与发送型号进行比较得到误码率。-Using matlab to base-band digital system simulation. Describes the overall system signal to send and modulation process. Which modulation using 16Q
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关于线性调频波的三个小程序,包括线性调频波的生成,FFT变换,线性调频信号通过匹配滤波器-Linear frequency modulation wave on the three small procedures, including the generation of LFM wave, FFT transform, linear frequency modulated signal through the matched filter
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这些可以实现信号调制,比如fsk,bpsk,ask,eqpsk,ook等,并画出相应的时域和频域波形,非常实用的源码。-These can be achieved signal modulation, such as fsk, bpsk, ask, eqpsk, ook, etc., and draw the appropriate time and frequency domain waveforms, a very useful source.
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一个相对完整的OFDM通信系统的仿真设计,包括编码,调制,IFFT,上下变频,高斯信道建模,FFT,PAPR抑制,各种同步,解调和解码等模
块,并统括系统性能的仿真验证了系统设计的可靠性。
-A relatively complete simulation of the OFDM communication system design, including coding, modulation, IFFT, frequency up and down, Gaussian channel
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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,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,计算误比特率。-First, this program uses 16QAM modulation mode, for a string of two binary source is modulated with a raised cosine roll-off function for base-ba
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Descr iption The WCDMA Physical Layer Demo consists of an end-to-end (transmitter-to-receiver) simulation of the Frequency Division Duplex (FDD) Downlink physical layer for several Dedicated Channels (DCH) as specified by the 3GPP standard (Release 9
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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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正交频分复用技术是近年来发展起来的新技术,在高速无线数据传输领域有很大的应用前景。文章在分析和总结相关文献的基础上,介绍了正交频分复用(OFDM)技术的发展历史,讨论了正交频分复用技术的基本原理和实现方法。通过分析表明,在高速无线通信中OFDM对于消除符号间干扰(ISI),降低系统的复杂度等方面具有很大优势。正交频分复用(OFDM)是一种多载波宽带数字调制技术,它能有效地克服传输中的多径干扰和消除码间串扰,适合于高速率的地面信道视频传输。本文就OFDM技术进行了较为详尽的分析,并对OFDM的传输
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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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pi/4-qdpsk调制解调程序,能有效地进行差分解调和鉴频器解调,在一些不易提取载波的场合很有用。因此,利用仿真来研究系统是必要的。-pi/4-qdpsk modulation and demodulation process, can effectively reconcile the difference solution frequency discriminator demodulation, carrier extraction in a number of difficult si
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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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用matlab产生符合要求的余旋信源,并设置载波频率,运用DSB调制画出调制后波形。-Using matlab to generate more than spin source to meet the requirements and set the carrier frequency, modulation using DSB modulated waveform draw.
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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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线性调频连续波的雷达测距测速的两次FFT(Linear frequency modulation continuous wave radar ranging and speed estimation by twice FFT.)
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利用MATLAB集成环境下的M文件,编写程序来实现MSK的调制解调,并绘制出解调前后的时域和频域波形及叠加噪声时解调前后的时频波形,根据运行结果和波形来分析该解调过程的正确性及信道对信号传输的影响。通过这次课程设计进一步加深了我对最小二进制相移键控(MSK)调制解调性能的理解与掌握,同时将课堂上学到的理论知识用于实践。增强了我在模拟仿真方面的能力,为以后系统开发和通信系统仿真打下了良好的基础。(The use of MATLAB in the integrated environment of
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