具有 1 个射频链的 OFDM-MIMO 系统的波束训练（Matlab代码实现）

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📋📋📋本文目录如下：🎁🎁🎁

目录

💥1 概述

📚2 运行结果

🌈3 Matlab代码实现

🎉4 参考文献

💥1 概述

本文包括波束训练、MIMO 信道生成、DFT 码本构建。DFT码本是为平面天线阵列构建的。

📚2 运行结果

🌈3 Matlab代码实现

部分代码：

%% Clear workspace

clear;
close all;

rng(0);

%% System parameters

fc = 30e9; % carrier frequency
N = 64; % number of subcarriers
L = 20; % number of clusters
M = 20; % number of non-resolvable paths per cluster
numRF = 1; % 1 data stream

% Antenna arrays - use isotropic antenna elements
% Transmitter
Ntv = 8;
Nth = 8;
Nt = Ntv*Nth;
% Define tapers to reduce sidelobes
dBdown = 30; % dB
taperz = chebwin(Ntv,dBdown);
tapery = chebwin(Nth,dBdown);
tap = taperz*tapery.'; % Multiply vector tapers to get 8-by-8 taper values
arrayTx = phased.URA('Size',[Ntv Nth],'ElementSpacing',[0.5*physconst('LightSpeed')/fc 0.5*physconst('LightSpeed')/fc],'Taper',tap);
posTx = getElementPosition(arrayTx);

% Receiver
Nrv = 4;
Nrh = 4;
Nr = Nrv*Nrh;
% Define tapers to reduce sidelobes
dBdown = 30; % dB
taperz = chebwin(Nrv,dBdown);
tapery = chebwin(Nrh,dBdown);
tap = taperz*tapery.'; % Multiply vector tapers to get 8-by-8 taper values
arrayRx = phased.URA('Size',[Nrv Nrh],'ElementSpacing',[0.5*physconst('LightSpeed')/fc 0.5*physconst('LightSpeed')/fc],'Taper',tap);
posRx = getElementPosition(arrayRx);

%% DFT codebook

eleSpacing = 0.5; % element spacing, normalized by wavelength
[beamTx,beamAngleTx,beamAngleElTx,beamAngleAzTx,beamElTx,beamAzTx] = getDFTCodebook(Ntv,Nth,eleSpacing,eleSpacing);
[beamRx,beamAngleRx,beamAngleElRx,beamAngleAzRx,beamElRx,beamAzRx] = getDFTCodebook(Nrv,Nrh,eleSpacing,eleSpacing);

% % Check a certain beam (index:18) at transmitter
% figure();pattern(arrayTx,fc,[-180:180],[-89:90],'PropagationSpeed',physconst('LightSpeed'),'CoordinateSystem','polar','Type','powerdb','Weights',beamTx(:,18));
%
% % Check beam patterns in azimuth using linear array (transmitter)
% array = phased.ULA('NumElements',Nth,'ElementSpacing',0.5*physconst('LightSpeed')/fc);
% figure();
% for n = 1:Nth
% pattern(array,fc,[-180:180],0,'PropagationSpeed',physconst('LightSpeed'),'CoordinateSystem','polar','Type','powerdb','Weights',beamAzTx(:,n));hold on;
% end

%% Perform beam training

% Generate MIMO channels
[h,arrayResponseTx,arrayResponseRx,pathGain] = MIMOChan(Nt,Nr,L,M,posTx,posRx);
H = 1/sqrt(N)*fft(h,N,3); % frequency-domain channel

% Beam sweeping
rPower = zeros(Nt,Nr,N);