从这个意义上讲,数字调制和模拟调制并无本质区别。数字调制信号只须表示离散的调制状态,这些离散状态在矢量图上称为符号点 (symbol point),符号点的组合称为星座图(constellation)。 OFDM原理 - 数字调制信号完成对时间离散状态的描述 星座图和符号 星座图展示了 QAM 格式的可用符号。以 16QAM星座图为例,每个符号表示...
clc; clearvars; close all; rolloff = 0.25; % Filter rolloff span = 6; % Filter span sps = 4; % Samples per symbol M = 4; % Size of the signal constellation k = log2(M); % Number of bits per symbol rrcFilter = rcosdesign(rolloff,span,sps); data = randi([0 M-1],10000,...
12、emodulation, sample sentences and string conversion, and a series of system design, the QPSK constellation diagram and the modulation and demodulation of the simulation, and the performance of the system are analyzed, and then proved the superiority of QPSK modulation technology.Keyword: QPSK Mo...
Second, the LabVIEW software is directly used for recovering the QPSK signal constellation without employing complex DSP circuit. Third, this scheme is applicable to multilevel modulation formats such as M-ar...doi:10.1142/S0217984918501038Yuan Zhao...
% 40 taps ,RLS 算法,步 长0.99,自相关矩阵逆矩阵的初值InvCorrInit 对角线上的元素 eq1.SigConst = step(hMod,(0:M-1)); % Set signal constellation. % 标准星座图 [symbolest,~] = equalize(eq1,rxFilt,x_training_msg(1:trainlen)); % Equalize. % 均衡器obj, 需要均衡的信号,训练序列 ...
QPSK调制与解调（Matlab仿真）1. 一般在仿真的时候，大家都喜欢直接做等效基带仿真（类似于星座点的仿真）。但实际要传，还是要传频带的波形信号。2. 为了模拟真实的环境，先把基带信号经过一个自定义的信道，然后再做脉冲成型，上变频，加一点噪声AWGN进去。3. 为了模拟同步，应该用专用的同步算法。但是这里的重点...
signal synthesis, coherent demodulation, sample sentences and string conversion, and a series of system design, the QPSK constellation diagram and the modulation and demodulation of the simulation, and the performance of the system are analyzed, and then proved the superiority of QPSK modulation techno...
Delllodulatetheinputsignalusingthequaternayr phaseshiftkeyinglllethod. 压in IDataTypesI Pareters Phaseoffset(rad): p订4Constellationordering:IIlinary ...三 Outputtype: I Decisiontype: 4 [Harddecision ..l... Ill _」 卜 I OK 11Cancel]I Help 11Appl三] ...
Signal constellation distortion and BER degradation due to hardware impairments in six-port receivers with analog I/Q generation Compact and powerful, the Vyper is fully compliant to the EN302307 standard, meaning it integrates constant coding, variable coding, and adaptive coding and modulation modes...
Constellation ordering(星座图编码方式)当输入信号类型设置为Bit时,QPSK基带调制器输入信号中得每两个二进制位表示一个四进制整数,这两个二进制位既可以是自然二进制编码序列,也可以是Gray码序列,他们产生不同的星座图。当constellation or 21、dering设置为binary时,输入信号是自然二进制编码序列;当constellation ...