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In this simulink model , QPSK modulation and demodulation is simulated .A square root raised cosine pulse shaped signal is modulated and given as input to the demodulator.The received signal is demodulated and given to the detector where it is matched filtered and down-sampled .The effects of symbol timing offset can be seen by varying the phase of down-sampling operation.The signal transmitted is recovered at the detector output.-In this simulink model , QPSK modulation and demodulation is simulated .A square root raised cosine pulse shaped signal is modulated and given as input to the demodulator.The received signal is demodulated and given to the detector where it is matched filtered and down-sampled .The effects of symbol timing offset can be seen by varying the phase of down-sampling operation.The signal transmitted is recovered at the detector output.

认知用户的发射功率是无约束的，两个认知用户和主用户在三维空间中的相对位置是随机分布的。

基于FFT的非二进制LDPC译码，非二进制ＬＤＰＣ的迭代译码算法可以通过ＦＦＴ运算来快速实现，具有译码效率高，性能好的特点。

讲解空时编码很好的文章PPT格式，北京邮电大学的教材！-Explain the space-time coding a very good article PPT format, Beijing University of Posts and Telecommunications of teaching materials!

手机串口通信设置程序，通过自定义的AT命令来完成-Phone serial communication setup program, through a custom AT command to complete

算法P&O如图1所示，电路如图2所示。我建议使用带3.3V电源的轨对轨放大器，以获得最佳效果并保护ADC。TI的OPA2350是一个不错的选择。每0.5秒跟踪一次最大功率点。

FSK信号的解调,FSK信号的解调中频fc为15MHz-FSK signal demodulation, FSK demodulation signal fc for the 15MHz IF

关于串口驱动的一个vc的小程序-Serial driver on a small program vc

是基于柴油发动机的多ecu间，通过CAN通讯的详细开发文档 -diesel engine is based on the multi-ecu, CAN communications through the development of detailed documentation

基于 CPU 的精确计时器，时钟频率越高，计时越准 -on CPU precision timer, clock frequency, the higher the more time-