gusucode.com > wlan工具箱matlab源码程序 > wlan/wlan/+wlan/+internal/mappingMatrix.m
function P = mappingMatrix(numSTS) %mappingMatrix HT-LTF and VHT-LTF orthogonal mapping matrix % % Note: This is an internal undocumented function and its API and/or % functionality may change in subsequent releases. % % P = mappingMatrix(NUMSTS) returns the orthogonal mapping matrix for a % given number of space-time streams NUMSTS. % Copyright 2016 The MathWorks, Inc. %#codegen % Mapping matrix % IEEE Std 802.11-2012 Eqn 20-27 Phtltf = [1 -1 1 1; 1 1 -1 1; 1 1 1 -1; -1 1 1 1]; if (sum(numSTS) <= 4) % 1-4 P = Phtltf; elseif sum(numSTS) > 4 && sum(numSTS) <= 6 % numSTS = {5,6} w = exp(-2*pi*1i/6); % IEEE Std 802.11ac-2013 Eqn 22-44 P = [1 -1 1 1 1 -1; ... 1 -w w^2 w^3 w^4 -w^5; ... 1 -w^2 w^4 w^6 w^8 -w^10; ... 1 -w^3 w^6 w^9 w^12 -w^15; ... 1 -w^4 w^8 w^12 w^16 -w^20; ... 1 -w^5 w^10 w^15 w^20 -w^25 ]; else % numSTS ={7,8} P = [Phtltf Phtltf; Phtltf -Phtltf]; end end