GFQldpc

In recent years, the number of portable mobile terminal users is increasing with improvement of the wireless communication environment. In addition, mobile multimedia services also bring the increase of wireless traffic and lack of spectrum resources. As a technique for efficient spectrum use, spectrum sharing receives much attention. It dynamically assigns a spectrum channel from a larger area network such as WiMAX to smaller area networks such as WiFi-based wireless LANs and achieves to increase the total wireless communication capacity of this area. In a case where all providers are cooperative, the spectrum sharing can be realized easily and improve user throughput in average. In another case where providers are not cooperative, some spectrum trading methods based on auction theory had been proposed.

CA 码的产生，以及自相关，互相关函数，画出自相关互相关图（MATLAB语句简单易懂，适合新手）(CA code generation, as well as autocorrelation, cross-correlation function, drawn from the correlation cross correlation diagram (MATLAB statement, easy to understand, suitable for novices))

说明：  仿真相干光通信系统，包含各种损伤和均衡算法(the model of coherent optical fiber channel)

16位CRC校验原理与算法分析，很详尽，学习CRC16的重要资料。(16-bit CRC checksum algorithm theory and analysis, very detailed and important information to learn CRC16.)

说明：  通信天线建模与MATLAB仿真分析书中10-4题目代码(Lossy Extractio Communication Antenna Modeling and MATLAB Simulation Analysis Book 10-4 Topic Code)

LDPC_OFDM系统在多径衰落信道下的性能分析。PDF论文。(LDPC_OFDM system performance anylasis in rayleigh fading channel. PDF paper)

基于宽带OFDM信号的DOA估计，采用经典的CSM算法，聚焦后采用传统MUSIC算法，最后通过谱峰搜素算法得到估计的来波角(Based on broadband OFDM signal DOA estimation, using the classical CSM algorithm, after focusing the traditional MUSIC algorithm, and finally through hormone peak search algorithm to estimate the wave angle)

ofdm信道估计仿真（ls算法，mmse算法，还有一种改进的mmse算法lmmse，可以直接在马特拉并上运行）(OFDM channel estimation simulation (ls algorithm, mmse algorithm, as well as an improved MMSE algorithm lmmse, can be directly in the Matra and run))

说明：  一个简单的verlog HDL教程，内容比较详细，可读性较高。(A simple verlog HDL tutorial, more detailed content, high readability.)

MODBUS RTU using Attiny44 from Atmel