SCM

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.)

在实际的调谐解调电路中，采用的是非相干载波解调，本振信号与发射端的载波信号存在频率偏差和相位抖动，因而解调出来的模拟I、Q基带信号是带有载波误差的信号。这样的模拟基带信号即使采用定时准确的时钟进行取样判决，得到的数字信号也不是原来发射端的调制信号，误差的积累将导致抽样判决后的误码率增大，因此数字QPSK解调电路要对载波误差进行补偿，减少非相干载波解调带来的影响。(In the actual tuning and demodulating circuit, non-coherent carrier demodulation is adopted, and the frequency deviation and phase jitter of the local oscillator signal and the carrier signal of the transmitting end are present, and thus the demodulated analog I and Q baseband signals are signals with carrier error.)

高斯一阶导数生成的UWB单脉冲信号，脉冲宽度为0.5ns(Gaussian first derivative monopulse generated UWB signal, pulse width of 0.5ns)

OFDM中降低峰均比的方法，将传统的SLM法，改进的SLM法和限幅加改进SLM法进行比较(Compare OFDM PAPR reducing methods in the traditional SLM method, improved SLM method and limiter plus improved SLM method)

it is a very good file for tunable band pass filters

用于labview 串口通讯,非常有用，并且实测有用(useing for labview serial communicaton,it very useful)

说明：  qpsk在高斯信道下的仿真，包括误码率和仿真图(Simulation of QPSK in Gaussian channel)

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.)

织带机监测系统的上位机软件。RS-485总线，类MODBUS协议。(Ribbon Machine Monitoring System for PC software. RS-485 bus, types of MODBUS protocol.)

说明：  4098QAM编码在AWGN信道下误码率性能与Eb/N0（信噪比）的关系(The performance of 4096QAM at AWGN channel: BER~Eb/N0)