AD1939

Abstract—Selection combining cascaded with maximum-ratio combining (SC/MRC), which is particularly useful when site diversity is available, combined with low-density parity-check (LDPC) codes is able to combat the effects of fading. The biterror rate (BER) expressions of uncoded SC/MRC and SC/MRC with LDPC codes over an independent and identically distributed Rayleigh-fading channel are derived based on the Gaussian approximation approach. These expressions are also applicable to the selection combining and maximum-ratio combining as special cases. The derived expressions are in good agreement with simulation results and approach the density evolution (DE) thresholds. These expressions are able to achieve a significant reduction in computational time with a reasonable accuracy for analyzing the BER performance as compared to simulations and DE.

说明：  改程序实现了用microchip公司dspic30f5015实现了PID算法。能够实现对电机的控制。(Reform program with the microchip company to achieve the realization of a PID algorithm dspic30f5015. Of motor control can be achieved.)

通过单片机控制，实现8个led灯流水显示。(Through the control of the single-chip microcomputer, 8 LED lights are displayed.)

数字电压表的源程序，可以实现实现测量电路的电压，精确到小数点后面三位数字。附带数字电压表的流程图(Digital voltage meter source, can be implemented to realize the voltage measurement circuit, down to the decimal point three digits.Attached flowchart of digital voltmeter)

自己画的四轴飞行器，原理图，pcb。。。。。。。。。。。。。。。。。。。。。。。为了20个子，我真的不容易(Own painting Four aircraft, schematics, pcb)

机械故障综合仿真实验平台，里面包含轴承故障实验、齿轮故障实验及加速退化试验平台，为学习故障诊断试验提供一定的依据。(Integrated simulation platform for mechanical failure, which contains the bearing fault test, gear fault test and accelerated degradation test platform, to provide a basis for the study of fault diagnosis test.)

LCD and Keypad ccs files

了解SINAD、ENOB、SNR、THD、THD + N、SFDR，不在噪底中迷失。用于定量表示ADC动态性能的常用指标有六个，分别是：SINAD(信纳比)、ENOB(有效位 数)、SNR(信噪比)、THD(总谐波失真)、THD + N(总谐波失真加噪声)和SFDR(无杂散动态 范围)。(Learn SINAD, ENOB, SNR, THD, THD+ N, SFDR, lost not noise floor. For quantitative expression commonly used indicators of the dynamic performance of the ADC six are: SINAD (SINAD), ENOB (effective number of bits) and SNR (signal-to-noise ratio), THD (total harmonic distortion), THD+ N ( The total harmonic distortion plus noise) and SFDR (spurious-free dynamic range).)

solidworks 做的零件，solidworks初学者可以用作学习的参考。(solidworks do parts, solidworks beginners learning can be used as a reference.)

这虽然是一个非常简单易行的时钟程C序，适合初学者(Although this is a very simple clock Cheng C sequence, suitable for beginners)