实验2-1_DOA

这个源代码是对MIMO系统的仿真，包括对MIMO信道的模拟以及不同的MIMO配置下，容量的特点。(This source code is a MIMO system simulation, including the simulation of the MIMO channel and different MIMO configuration, capacity characteristics.)

信息经格雷码映射，进行QPSK调制并通过AWGN信道发射，在接收端进行QPSK解调，并统计误符号率和误码率。(Information on the Gray code mapping, QPSK modulation and emission through the AWGN channel, QPSK demodulator at the receiving end, and the statistical symbol error rate and bit error rate.)

In this paper, we present and analyze efficient frame synchronization and frequency offset compensation scheme with ternary sequences for an orthogonal frequency division multiplexing (OFDM) system in Rayleigh fading channels. Frame synchronization is an essential procedure for normal operation of the OFDM system because of sensitivity to synchronization errors. And when there are frequency offsets in OFDM frame, the loss of orthogonality occurs and the interference problem among several subcarriers is introduced. These fact leads to the requirement for joint implementation of the frame synchronization and frequency offset compensation.

水声声线仿真，基于射线模型。文章包含仿真条件和说明。文章附件为程序。(Underwater acoustic line simulation, based on the ray model. The article contains simulation conditions and instructions. The article appendix is the procedure.)

仿真了高斯白噪声，并通过巴特沃夫滤波器生成高斯色噪声(The gaussian noise was simulated and the gaussian noise was generated through the butterworth filter)

Z域表示的数字滤波器的响应举例,利用给出的Z域的传递函数，求在给定初始状态和输入信号的情况下的系统的零输入响应，零状态响应，完全响应等。(Z-domain representation of the response of the digital filter for example, using the given Z-domain transfer function, to seek zero input response of the system in the case given the initial state and the input signal, the zero state response, complete response.)

串口通过modbaus协议控制继电器，读取开关输入的PC上位机源程序(Serial control relay through modbaus agreement, read the PC host computer switch input source)

一个可以用语音modem录音放音的Delphi控件源码(A modem with voice recording playback control of Delphi source code)

QAM调制的误码率仿真代码，通俗易懂，简单实用。(The error rate simulation code of QAM modulation is easy to understand, simple and practical.)

optimal coverage problem of wireless sensor network