DVB_S2_Codes

Selective mapping algorithm is proposed to reduce the peak-to-average power ration (PAPR) in MIMO-OFDM system. It is proved that the conjugate symbols on two antennas have the same PAPR property with orthogonal space-time block coded (STBC). By using the characteristic, the computational complexity cost and the side information (SI) is significantly reduced compared with the concurrent SLM algorithm. Simulation results demonstrate that the performance of the proposed algorithm outperforms the conventional concurrent SLM algorithm.

TDOA算法包括泰勒，最小二乘法，chan算法及改进算法等(TDOA algorithm includes Taylor, least square method, Chan algorithm and improved algorithm)

Test for DatagramChannel Source Code for Andriod.

说明：  实现了一个直接扩频系统，使用BPSK作为调制解调方法。并比较白噪声AWGN及瑞利衰落(rayleigh fading)环境下，误码率的影响。(There are two files in the zip folder. bpsk_spread.m and jakesmodel.m Steps for simulation: 1] Run jakesmodel.m first 2] Then run bpsk_spread.m . 3] Note that during the first run bpsk_spread.m has no rayleigh fading.This is because the corresponding code has been commented 4] The resulting performance is stored in BER_awgn. 5] Now uncomment the Rayleigh Fading code in bpsk_spread.m file. 6] Same time comment BER_awgn (line 112) and uncomment BER_ray variable. 7] Run the simulation. To compare the perfromances of the receiver using DSSS plot the BER_awgn and BER_ray >>semilogy([1:8],BER_awgn(1:8), g* ) hold on semilogy([1:8],BER_ray(1:8), -.b* ) hold on grid on )

CONVERT A MATRIX TO LOWER TRIANGULAR MATRIX

电脑之间蓝牙的通信，相当于一个蓝牙工具吧。(Bluetooth communication between computers, the equivalent of a Bluetooth tool bar.)

the matlab file gives LS, MMSE, LMMSE channel estimation for wireless channel, very short and good

optisystem7入门中文讲义（网络版）以及Demo(Introduction to Chinese optisystem7 notes (Online))

介绍常用的AT指令，包括gpsr初始化，发短信等(Commonly used in the AT commands, including the gpsr initialization, send text messages, etc.)

对移动通信中的多径多普勒频移进行详细的仿真，对学习这个的朋友有极大的帮助(Of mobile communication in multi-path Doppler frequency shift to conduct a detailed simulation study of the friends of great help)