Auto-correlation, also called series correlation, is the correlation of a given sequence with itself as a function of time lag. Cross-correlation is a more generic term, which gives the correlation…

# Tag: Auto-Correlation

If you are looking for a way to generate AWGN noise in Matlab, go here. Checkout this ebook : Digital Modulations using Matlab – by Mathuranathan Viswanathan White Noise Process A…

Abstract To study the characteristics of the noise received by Software defined radio (SDR) and the characteristics of signal transimtted from one SDR to the other SDR using Intermediate Frequency…

Abstract To study the characteristics of the noise received by Software defined radio (SDR) and the characteristics of signal transimtted from one SDR to the other SDR using Intermediate Frequency…

The following is a function to generate a Walsh Hadamard Matrix of given codeword size. The codeword size has to be a power of 2.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 |
function [H]=generateHadamardMatrix(codeSize) %[H]=generateHadamardMatrix(codeSize); % Function to generate Walsh-Hadamard Matrix where "codeSize" is the code % length of walsh code. The first matrix gives us two codes; 00, 01. The second % matrix gives: 0000, 0101, 0011, 0110 and so on % Author: Mathuranathan for https://www.gaussianwaves.com % License: Creative Commons: Attribution-NonCommercial-ShareAlike 3.0 % Unported %codeSize=64; %For testing only N=2; H=[0 0 ; 0 1]; if bitand(codeSize,codeSize-1)==0 while(N~=codeSize) N=N*2; H=repmat(H,[2,2]); [m,n]=size(H); %Invert the matrix located at the bottom right hand corner for i=m/2+1:m, for j=n/2+1:n, H(i,j)=~H(i,j); end end end else disp('INVALID CODE SIZE:The code size must be a power of 2'); end |

Example: To Generate Walsh…

In spread spectrum communications, typically in CDMA, the user data is multiplied with a spreading sequence to achieve spreading . When the signal is received, the spreading is removed from…

In communication systems the noise is mostly modeled as white noise. When there exists a noise that is “white” , then there must also exist a noise that is colored…

One Comment