16QAM simulation in Rayleigh Channel源码程序 - matlab通信信号

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标题：16QAM simulation in Rayleigh Channel源码程序
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所属分类: 通信信号资源类型：文件大小: 2.06 KB 上传时间: 2016-01-30 12:20:32 下载次数: 9 资源积分：1分提供者: 源码共享 20160130121850535

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16QAM simulation in Rayleigh Channel源码程序，程序员在编程的过程中可以参考学习使用，希望对IT程序员有用，此源码程序简单易懂、方便阅读，有很好的学习价值！

% Clear all the previously used variables and close all figures

clear all;

close all;

format long;

% Frame Length 'Should be multiple of four or else padding is needed'

bit_count = 1*1000;

% Range of SNR over which to simulate

Eb_No = 0: 1: 10;

% Convert Eb/No values to channel SNR

SNR = Eb_No + 10*log10(4);

% Start the main calculation loop

for aa = 1: 1: length(SNR)

% Initiate variables

T_Errors = 0;

T_bits = 0;

% Keep going until you get 100 errors

while T_Errors < 100

% Generate some random bits

uncoded_bits = round(rand(1,bit_count));

% Split the stream into 4 substreams

B = reshape(uncoded_bits,4,length(uncoded_bits)/4);

B1 = B(1,:);

B2 = B(2,:);

B3 = B(3,:);

B4 = B(4,:);

% 16-QAM modulator

% normalizing factor

a = sqrt(1/10);

% bit mapping

tx = a*(-2*(B3-0.5).*(3-2*B4)-j*2*(B1-0.5).*(3-2*B2));

% Variance = 0.5 - Tracks theoritical PDF closely

ray = sqrt((1/2)*((randn(1,length(tx))).^2+(randn(1,length(tx))).^2));

% Include The Fading

rx = tx.*ray;

% Noise variance

N0 = 1/10^(SNR(aa)/10);

% Send over Gaussian Link to the receiver

rx = rx + sqrt(N0/2)*(randn(1,length(tx))+1i*randn(1,length(tx)));

%---------------------------------------------------------------

% Equaliser

rx = rx./ray;

% 16-QAM demodulator at the Receiver

a = 1/sqrt(10);

B5 = imag(rx)<0;

B6 = (imag(rx)<2*a) & (imag(rx)>-2*a);

B7 = real(rx)<0;

B8 = (real(rx)<2*a) & (real(rx)>-2*a);

% Merge into single stream again

temp = [B5;B6;B7;B8];

B_hat = reshape(temp,1,4*length(temp));

% Calculate Bit Errors

diff = uncoded_bits - B_hat ;

T_Errors = T_Errors + sum(abs(diff));

T_bits = T_bits + length(uncoded_bits);

end

% Calculate Bit Error Rate

BER(aa) = T_Errors / T_bits;

disp(sprintf('bit error probability = %f',BER(aa)));

% Plot the received Symbol Constellation

figure;

grid on;

plot(rx,'x');

xlabel('Inphase Component');

ylabel('Quadrature Component');

Title(['Constellation of Transmitted Symbols for SNR =',num2str(SNR(aa))]);

end

%------------------------------------------------------------

% Finally plot the BER Vs. SNR(dB) Curve on logarithmic scale

% BER through Simulation

figure(1);

semilogy(Eb_No,BER,'xr-','Linewidth',2);

hold on;

xlabel('E_b / N_o (dB)');

ylabel('BER');

title('E_b / N_o Vs BER plot for 16-QAM Modualtion in Rayleigh Channel');

% Theoretical BER

figure(1);

theoryBerAWGN = 0.5.*erfc(sqrt((10.^(Eb_No/10))));

semilogy(Eb_No,theoryBerAWGN,'g-+','Linewidth',2);

grid on;

legend('Rayleigh', 'AWGN');

axis([Eb_No(1,1) Eb_No(end) 0.00001 1]);

文件列表（点击上边下载按钮，如果是垃圾文件请在下面评价差评或者投诉）:

16QAM simulation in Rayleigh Channel源码程序/
16QAM simulation in Rayleigh Channel源码程序/16 QAM simulation in Rayleigh Channel/
16QAM simulation in Rayleigh Channel源码程序/16 QAM simulation in Rayleigh Channel/BER_16_QAM_rayleigh.m

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