抖音小说小程序,采用Linux+Nginx+Golang+PHP+React+MySQL+Redis开发。主要实现了小说的阅读,用户分析,数据统计等功能。系统支持两者付费模式(充值书币或者充值会员,两者可以共存),目前项目已经有上线的案例,与市场上其他小说小程序相比,我们只做抖音,小程序接口采用golang开发,并发性能更好,单机2核4G服务器(5M带宽)即可满足企业的初期发展使用
The dithering novel applet is developed using Linux+Nginx+Golang+PHP+React+MySQL+Redis. It mainly realizes novel reading, user analysis, data statistics and other functions. The system supports both payment modes (recharge book currency or recharge member, both can coexist). At present, the project has been launched. Compared with other novel applets on the market, we only do dithering. The applet interface is developed by golang, with better concurrent performance. A single 2-core 4G server (5M bandwidth) can meet the initial development and use of enterprises (2024-01-08, PHP, 0KB, 下载0次)
OFDM仿真，（1）通过对OFDM信号各个子载波赋共轭对称的数据产生一个实OFDM符号；?（2）给OFDM符号加循环前缀与循环后缀；?（3）给OFDM符号加窗。在程序中加入的是升余弦窗，可以通过改变升余弦窗的滚降系数观察加入不同升余弦窗，对OFDM信号频谱的影响；?（4）信道采用加性高斯白噪声信道。可以通过改变信噪比改变信道环境，从而在接收端通过误码率或星座图观察信道对OFDM信号传输的影响；?（5）去除循环前缀与循环后缀，对OFDM信号进行解调
Generate a real OFDM symbol by assigning conjugate symmetric data to each subcarrier of the OFDM signal; (2) add a cyclic prefix and a cyclic suffix to the OFDM symbol; (3) add a window to the OFDM symbol. What is added in the program is a raised cosine window. You can observe the effect of adding different raised cosine windows on the OFDM signal spectrum by changing the roll-off coefficient of the raised cosine window; (4) The channel adopts additive Gaussian white noise channel. The channel environment can be changed by changing the signal-to-noise ratio,thereby observing the influence of the channel on OFDM signal transmission through bit error rate or constellation diagram at the receiving end; (5) Remove the cyclic prefix and suffix, and demodulate the OFDM signal (2020-11-05, matlab, 3KB, 下载2次)
LDPC 译码算法主要研究了基于概率测度的BP 译码算法、基于LLR 的BP 译码算法、归一化最小和译码算法等算法。最终的实现选择了适合 FPGA 硬件实现的归一化最小和译码算法。在实现结构方面，对 TPMP 和 TDMP 两种实现结构进行了仿真对比，最终选择了收敛速度快、迭代次数少的 TDMP 实现结构，即水平分层迭代结构。最终实现的译码器可以信噪比为 2.5d B 时，BER 可以达到10-6。另外，为了实现高速译码器的目标，译码器的实现过程中采用了乒乓操作、流水线结构、四个码字同时译码等结构来提高译码器的吞吐率。
LDPC decoding algorithm mainly studies BP decoding algorithm based on probability measure, BP decoding algorithm based on LLR, normalized minimum sum decoding algorithm and so on. Finally, the normalized minimum sum decoding algorithm suitable for FPGA hardware implementation is selected. In the aspect of implementation structure, tpmp and tdmp are simulated and compared. Finally, tdmp implementation structure with fast convergence speed and less iteration times is selected, that is horizontal layered iterative structure. The final decoder can achieve BER of 10-6 when SNR is 2.5dB. In addition, in order to achieve the goal of high-speed decoder, ping-pong operation, pipeline structure and simultaneous decoding of four codewords are used to improve the throughput of the decoder. (2020-09-12, C/C++, 2724KB, 下载5次)
基于CDMA扩频通信技术的仿真，采用的调制方法是GMSK调制，模拟信道噪声，输出信噪比，说明CDMA扩频通信的抗噪性
58/5000
Jīyú CDMA kuò pín tōngxìn jìshù de fǎngzhēn, cǎiyòng de tiáozhì fāngfǎ shì GMSK tiáozhì, mónǐ xìndào zàoshēng, shūchū xìn zào bǐ, shuōmíng CDMA kuò pín tōngxìn de kàng zào xìng
Based on the CDMA spread spectrum communication technology, the modulation method adopted is GMSK modulation, analog channel noise, output signal to noise ratio, which shows the noise immunity of CDMA spread spectrum communication (2017-04-22, matlab, 1KB, 下载10次)
对Schmidl&Cox算法的分析，提出了一种改进的定时同步方案。该方案
利用前导字的相关性，通过改进同步算法实现接收端的定时同步，在高斯信道和SUI一3信
道环境下进行仿真，结果表明：改进的定时同步方案优于传统方案，能取得良好的定时同步。
Schmidl & Cox analysis of algorithms, an improved timing synchronization scheme. The program draws on the leading word correlation, the receiving end of timing synchronization through improved synchronization algorithm, Gaussian channel and SUI-3 letter Road environment simulation results show that: improved timing synchronization scheme is better than traditional programs, can achieve good timing synchronization. (2013-04-18, matlab, 1KB, 下载33次)
LTE基带收发仿真系统，在该仿真平台中，分为4种运行模式
? 第一种模式为载入小区参数（仅发端）。参数配置从题目给定的’小区参数.dat’文件中读取参数。并将题目给的’业务数据.dat’作为发送的信息比特，对其进行基带的处理。
? 第二种模式为手动配置参数（仅发端）。使用者可通过界面上的提供的选项，为基站的基带处理配置参数。有效参数包括系统公共参数、用户公共参数、用户独立参数以及仿真次数。
? 第三种模式为仿真BLER曲线（包含发端收端）。使用者除了配置第二种模式的选项外，还可以选择第三列的参数。第三列里的参数选项主要包括接收方式配置、仿真信噪比区间、信道的选择等参数。程序运行结束后，会在右下角的绘图区域显示本次仿真的误块率曲线。
? 第四种模式为载入已有BLER曲线。因为得到误块率曲线花费的时间很长，使用者可以载入预先仿真好的部分曲线。
LTE baseband simulation of PDSCH process about physical layer aspect,including single antenna spatial multiplexing and transmit divisity. (2010-08-15, matlab, 132KB, 下载707次)
设定无线接入点能够始终提供最大吞吐量，终端节点的冗余通信模块各自的网络信道信噪比值随机变化，由此计算得冗余网络各自的CHF值。CHF切换机制根据冗余网络各自的采样值大小进行切换判决，考虑门限的CHF切换机制根据设定的上下切换门限值进行切换判决
Configure wireless access points can always provide the maximum throughput, end-node redundant network communication module respective channel signal to noise ratio value of random changes, which calculated the respective redundant network CHF values. CHF redundant network switching mechanism in accordance with their respective values of the size of the sampling switch decision, consider the threshold of CHF switch mechanism according to set upper and lower limit switch door switch decision (2008-07-16, matlab, 1KB, 下载40次)