Sonar_Exp_beamform

ADIBEAM Abstract—the increase in navigation accuracy demanded by EGNOS and Galileo and their future evolution encourages the study and design of advance receiver architectures. In that direction, the ADIBEAM project focuses on the design of high accuracy ground stations, specifically GNSS Reference Stations, in order to improve its robustness in front of multipath and interference errors with the goal of achieving centimeter level tracking accuracy. The adoption of antenna arrays and digital beamforming at the ground reference station receivers is one of the most promising approaches to cope with errors induced by multipath and interference.

实现各种MIMO检测算法，包括MRC，ZF，MMSE和SIC(Implementation of MIMO Detection Algorithms)

说明：  QPSK调制解调源文件 QPSK调制解调源文件(QPSK demodulator source QPSK modulation and demodulation source)

北邮计算机网络实验一，滑动窗口的回退n协议，实测信道利用率很高。(Computer network experiment 1, sliding window backoff n protocol, the measured channel utilization is very high.)

基于BPSK的通信系统程序，上采样，平方根升余弦滤波器(Bpsk - based communication system program)

人工神经网络的工具想函数一览表，可以查询很方便的(artificial neural network tool to the list of functions that can be very convenient inquiry)

单片机发送报文控制手机模块GR47进行gprs连接登陆，发送接收数据(SCM reportedly sent mobile phone text control module for EDGE connectivity GR47 landing, send and receive data)

Very good reference materials on network information theory

说明：  生成2KHz和8KHz的混合信号,使该信号通过上述滤波器,观察滤波前后的波形变化和频谱分布情况, 在改信号中加入高斯白噪声,(The mixed signal of 2KHz and 8KHz is generated so that the signal passes the above filter, the waveform change and spectrum distribution before and after filtering are observed, and Gao Si white noise is added to the modified signal.)

Multiple input multiple output techniques combined with orthogonal frequency division multiplexing (MIMO-OFDM) provide a promising approach for wireless systems. However, a serious drawback of the OFDM system is the high peak-toaverage power ratio (PAPR), which may severely affect the power efficiency of RF power amplifiers. In this paper, we propose a simple method to reduce the PAPR of MIMO-OFDM signals based on the use of unused subcarriers. Instead of processing the signals at each transmitter separately, a peak cancelling signal is generated at one antenna and is then applied to all the others with only simple modifications. Simulation has shown that a minimum 2 dB reduction in PAPR can be achieved for all transmit signals using this approach. As the signal processing is nearly all done at a single transmitter, repetition of the operations at each transmitter is avoided, and therefore the overall cost of the system can be significantly reduced.