cod14751

fpga时钟，是入门的基础；希望对大家有帮助！(fpga clock, is the entry of the base want to help you!)

实现基于STBC的MIMO_OFDM通信系统在不同信噪比情况下接收端的误比特率的仿真。发射端包括基于基带调制、空时编码、导频插入、IFFT、串并合并以及添加循环前缀；接收端包括去除循环前缀、取出导频估计信道、FFT运算以及并串合并，空时解码等。仿真中采用QPSK、空时编码采用4*3的复正交空时编码矩阵。OFDM子载波数为100，每个子载波传输66个符号，每个符号2比特。IFFT长度为512个符号。发射天线为3个接收天线为2个。(The BER simulation of MIMO_OFDM communication system based on STBC under different SNR is realized. The transmitter includes baseband modulation, space-time coding, pilot insertion, IFFT, serial-parallel combination and adding cyclic prefix; the receiver includes removing cyclic prefix, extracting pilot estimation channel, FFT operation, parallel-serial combination, space-time decoding, etc. The complex orthogonal space-time coding matrix is used in QPSK and space time coding in 4*3. The number of OFDM subcarriers is 100, and each subcarrier transfers 66 symbols with 2 bits per symbol. IFFT is 512 symbols in length. The transmitting antenna is 3 receiving antennas, 2.)

线性调频信号和相位编码信号（七位巴克码）及他们的混合调制信号在matlab中的实现(The realization of the chirp signal and the phase-encoded signal (seven Barker code) and their hybrid modulation signal in matlab)

说明：  OFDM信道估计的主要程序，算法研究等。(OFDM channel estimation algorithm for the main program, etc.)

对BPSK进行matlab仿真，包括完整参数，星座图(Matlab simulation of BPSK)

多个信道模型仿真模型MATLAB源码，包括自由空间路径损耗函数、Okumura-Hata模型、COST231-WI视距模型、COST231-WI非视距模型、Rayleigh信道及COST-231 Hata模型等。(Multiple chanel model simulation with MATLAB code, include wireless_free_space_attenuation model, Okumura-Hata model, COST231-WI LOS model, COST231-WI NLOS model, Rayleigh model, etc al.)

绝对原创代码，目前正在产品上应用。基于NXP的LPC2220的串口升级程序，在PC端用VC++ 6.0编写，对于ARM7特别是IAP升级具有很好的参考价值。(Absolute original code, and is currently being applied on products. Based on NXP' s LPC2220 serial upgrade, in the PC side using VC++ 6.0 to prepare for the ARM7 particular IAP upgrades have good reference value.)

MIMO系统的ZF和MMSE预编码算法-4发4收(ZF and MMSE MIMO system pre-coding algorithm-4 of 4 admission)

实现完整的4CPM(h=1/2)调制解调程序，包括消息序列生成，串并转换，升抽样成形滤波，数字上变频，多项式非线性效应，AWGN信道，到接收端数字下变频，降采样，匹配滤波，接收端基带信号星座图。(Message sequence generation, serial-parallel conversion, up sampling shaping filter, digital upconversion, polynomial nonlinear effects, AWGN channel, to the receiver digital down-conversion, down-sampling, the matched filter, the receiving end the baseband signal constellation.)

说明：  本人用石川法求齿轮的啮合刚度，完整版的程序，里面可以运行啮合刚度图(Meshing Stiffness of Gears Calculated by Ishikawa Method)