基于分层思想设计的空时编码很好地 体现了空分复用的思想。随后,Tarokh等人在此基础上,为追求更好的系统性能,结合延迟发射分集技术(Delay Transmit Diversity,DTD)提出了空时网格编码(Space-Time Trellis Code, STTC)的概念。这种空时码字的设计融合了网格编码调制(Trellis Coded Modulation,TCM)和发 射分集两者的优点...
Modulation ofdm.PSpace = 1; % pilot space between two pilots % channel parameters chan.SNR_dB = 15; % signal to noise ratio chan.L = 6; % number of channel taps between each transmit-receive antenna % control parameters ofdm.ifDemodulateData = 1; % (1,0) if 1, the code de...
pn_code_temp=generate(h1); pn_code=2*pn_code_temp-1; pn_code=reshape(pn_code,61,[]); modulate_data_pn=zeros(61,2*modulate_length); fori=1:modulate_length modulate_data_pn(:,(2*i-1))=modulate_data_temp(:,i); modulate_data_pn(:,2*i)=pn_code(:,i); end modulate_data_pn...
where {Xk} are data symbols, andTis the OFDM symbol time. The data symbolsXkare typically complex and can be from any digital modulation alphabet (for example, QPSK, 16-QAM, 64-QAM, etc.). Note The MATLAB®implementation of the discrete Fourier transform normalizes the output of the IFF...
matlab2022a仿真结果如下: 3.MATLAB核心程序 pilot_sym = pilot_generator(128); % Generate the pilot symbols, all in BPSK modulation pilot_syms=pilot_sym'; pilot_syms=pilot_syms(:)'; idx=0; for snr = 0:4:40 idx=idx+1; nframe = 0; ...
Orthogonal Frequency Division Multiplexing (OFDM) is the multicarrier digital modulation technique used by modern wireless communications systems such as 5G and LTE cellular, and WiFi.
LTE OFDM Modulation and Propagation Channel Models Examples OFDM Synchronization 802.11 OFDM Beacon Receiver with USRP Hardware; HDL OFDM Receiver Massive MIMO Hybrid Beamforming NR Cell Search and MIB and SIB1 Recovery 6G Technology: Wideband Signal Analysis in MATLAB(3:42)- Video ...
1.算法仿真效果 matlab2022a仿真结果如下: 2.算法涉及理论知识概要 移动视频图像传输,广泛用于公安指挥车、交通事故勘探车、消防武警现场指挥车和海关、油田、矿山、水利、电力、金融、海事,以及其它的紧急、应急指挥系统,主要作用是将现场的实时图像传输回指挥中心,使
where {Xk} are data symbols, andTis the OFDM symbol time. The data symbolsXkare typically complex and can be from any digital modulation alphabet (for example, QPSK, 16-QAM, 64-QAM, etc.). Note The MATLAB®implementation of the discrete Fourier transform normalizes the output of the IFF...
% signals. The effects on spectrum ang Modulation Error Rate (MER) is of % more concern. % % Written By : Hamid Ramezani % Date : 17-Jun-2007 % Code version : 1 % Matlab Version : 7.4.0.287 (R2007a) %=== % Initialization clear all; close all; clc; %===...