ofdm_psd_spectrum

OFDM（正交频分复用）系统以其抗多径衰落和较高的频带利用率，得到了众多领域的广泛应用。本文就OFDM系统中关键技术之一的信道估计技术进行了介绍。并分别叙述了OFDM系统和信道估计的意义，归纳了信道估计的分类，最后介绍了MMSE、LS及其改进信道估计算法并仿真出结果。(OFDM（orthogonal frequency division multiplexing) has been widely used in many areas for its good resistance to multipath fading and high bandwidth efficiency.In this paper,channel estimation,which is one of the key technologies in OFDM systems,were introduced. Then we discuss the significance of the channel estimation and the classification of channel estimation.Finally,we study the algorithms of channel estimation such as MMSE,LS and LMMSE,and further get the simulation results. )

OQPSK信号的频率估计，用的是相位与时钟联合估计算法，适用于突发的卫星信号等(OQPSK signal frequency estimation, using a phase estimation algorithm combined with the clock for emergency satellite signals)

MUSIC算法 频率估计 可运行 阵列信号处理(MUSIC ADSTISEMENT TRUE)

说明：  matlab ldpc EXIT code

卡尔曼滤波器介绍,个人感觉比较好的资料。(kalman (explain in detail) )

说明：  大规模天线检测，运用近似消息传递算法，仿真实验(Massive MIMO detection by implement AMP)

说明：  单模光纤中相干接收QPSK信号应用了CMA算法的简单DSP示例，自带vpa仿真数据。(A simple DSP example of CMA algorithm is used to receive QPSK signals coherently in single-mode optical fibers, with VPA simulation data.)

Matlab编写BPSK信号通过AWGN信道的仿真过程(Matlab BPSK signal through AWGN channel simulation)

dac8568驱动程序编程，可以控制dac8568进行输出(Dac8568 driver programming)

高斯信道下DFT-S OFDM 理论误码率仿真代码及其仿真结果图(DFT-S OFDM theoretical BER simulation code and simulation results Figure in Gaussian channel )