Quadrature-amplitude-modulation---Wikipedia--the-

说明：  无线衰落信道下的通信仿真，可以更换几种常见的衰落模型，如莱斯衰落，瑞利衰落等(Several common fading models, such as rice fading and Rayleigh fading, can be replaced in the communication simulation of wireless fading channel.)

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这是一个完整的OFDM通信系统仿真代码。包括信源编码信源调制，信道编码，信道估计，峰均抑制比等。实际程序可用直接运行。(This is a complete OFDM communication system simulation code. Including the source modulation source coding, channel coding, channel estimation, peak to average ratio suppression. The actual procedure can be run directly.)

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说明：  3. 瑞利信道中的调制解调、信道估计： (1) 请推导出单径瑞利信道中的BPSK相干解调的理论误码率性能，并画出比特信噪比与误码率的关系曲线。 (2) 在单径瑞利信道中，请设计一种时分的导引辅助的信道估计方法，用Simulink进行仿真，测量BPSK的误码率性能，画出比特信噪比与误码率的关系曲线，并与理论误码率曲线进行对比。(3. Modulation demodulation and channel estimation in Rayleigh channel: (1) deduce the theoretical bit error rate performance of BPSK coherent demodulation in single-path Rayleigh channel, and draw the relationship curve between bit signal-to-noise ratio and bit error rate. (2) in single-path Rayleigh channel, please design a time-division guidance assisted channel estimation method, Simulink simulation, measure the bit error rate performance of BPSK, draw the relationship curve between bit SNR and bit error rate, and compare with the theoretical bit error rate curve.)

这个matlab代码仿真了M-QAM的传输。M的取值不同，调制方式分别为4QAM，16QAM，64QAM等。传输信道为AWGN信道，能出误码率曲线。(The matlab code simulation of the M-QAM transmission. The value of M, the modulation mode of 4QAM, 16QAM, 64QAM. The transmission channel is AWGN, the BER curves.)

说明：  北邮计算机网络实验一，滑动窗口的回退n协议，实测信道利用率很高。(Computer network experiment 1, sliding window backoff n protocol, the measured channel utilization is very high.)

说明：  matlab ldpc EXIT code

The whole reuse mode of LTE is simulated systematically, which is a good learning program.

ofdm系统的simulink仿真 绝对可用(the ofdm system of simulink simulation is absolutely available)