gusucode.com > wlan工具箱matlab源码程序 > wlan/wlan/+wlan/+internal/pilotPolaritySequence.m
function seq = pilotPolaritySequence(varargin) %pilotPolaritySequence Pilot polarity sequence % % Note: This is an internal undocumented function and its API and/or % functionality may change in subsequent releases. % % SEQ = pilotPolaritySequence(N) returns the pilot polarity sequence % specified in IEEE Std 802.11-2012 Eqn 18-25 for a given OFDM symbol % index N. % Copyright 2015-2016 The MathWorks, Inc. %#codegen % Pilot polarity sequence, p_n, IEEE Std 802.11-2012, eqn 18-25 pn = [1 1 1 1 -1 -1 -1 1 -1 -1 -1 -1 1 1 -1 1 -1 -1 1 1 -1 1 1 -1 1 1 1 1 ... 1 1 -1 1 1 1 -1 1 1 -1 -1 1 1 1 -1 1 -1 -1 -1 1 -1 1 -1 -1 1 -1 -1 1 ... 1 1 1 1 -1 -1 1 1 -1 -1 1 -1 1 -1 1 1 -1 -1 -1 1 1 -1 -1 -1 -1 1 -1 -1 ... 1 -1 1 1 1 1 -1 1 -1 1 -1 1 -1 -1 -1 -1 -1 1 -1 1 1 -1 1 -1 1 1 1 -1 ... -1 1 -1 -1 -1 1 1 1 -1 -1 -1 -1 -1 -1 -1].'; NumPN = numel(pn); if nargin==1 idx = varargin{1}; % Argument is OFDM symbol index (n) else idx = 0:NumPN-1; % Return whole sequence end % Cyclic extend sequence as required (modulus) seq = pn(mod(idx,NumPN)+1); end