IEEE_80211n_CMSC_20040527

说明：  对当前通信信号中常用的数字调相信号BPSK、QPSK、1／4一QPSK、8PSK的调制识别问题，提出了一种基于信号差分高阶累积量的识剐算法。该算法分两个层次进行调制识别，首先利用信号的四阶累积量特征对BPSK、QPSK和{1／4一QPSK、8PSK}信号进行识别，然后再利用信号差分的四阶和八阶累积量特征对1/4-QPSK、8PSK信号进行识别。从理论上分析了的该算法的有效性，并通过计算机仿真验证了算法具有良好的性能。(A recognition algorithm based on differential high-order cumulant is proposed for the modulation recognition problems of BPSK, QPSK, 1/4-QPSK and 8PSK, which are commonly used in current communication signals. The algorithm is divided into two levels for modulation recognition. Firstly, BPSK, QPSK and {1/4-QPSK, 8PSK} signals are identified by using the fourth-order cumulant characteristics of signals, and then 1/4-QPSK and 8PSK signals are identified by using the fourth-order cumulant and eighth-order cumulant characteristics of signal difference. The validity of the algorithm is analyzed theoretically, and the good performance of the algorithm is verified by computer simulation.)

modbus 协议文本，介绍MODBUS协议的所有内容，(Modbus text of the agreement to introduce all the elements of MODBUS protocol,)

A Comparison Between the Centralized and Distributed Approaches for Spectrum Management

说明：  基于FPGA的16QAM调制解调设计，以及仿真实现(Design of 16QAM Modulation and Demodulation Based on FPGA)

说明：  基于matlab实现OFDM，调制方式为QPSK，可以对信道的状态进行估计(OFDM is realized based on MATLAB, the modulation mode is QPSK, and the channel state can be estimated)

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)

matlab程序，包括QPSK,16QAM,64QAM等多种调制方式的调制解调(modulation and demodulation of QPSK,16QAM and 64QAM etc.)

说明：  数字通信系统的仿真，全matlab代码，实测可用(Digital communication system simulation, full matlab code, measurement available)

说明：  This is the document about MIMO

conversion of a matrix into lower triangular matrix