wlanwaveforrm generator output is scaled by a factor 8.5524 and also the alternate complex values are negated. May i know the reason?

%%%% Program to find Channel Frequency Response (CFR) of the populated subcarriers of LLTF field for (MODEL B) Delay Profile

clc; clear all; close all;

cfgSU = wlanHESUConfig; %wlanHESUConfig creates a single user (SU) high efficiency (HE)format configuration object. This object contains the transmit

%parameters for the HE-SU format of IEEE P802.11ax/D3.1 standard.

cfgSU.ChannelBandwidth='CBW20';

cfgSU.MCS = 0; %BPSK Modulation and coding rate = 1/2. Applicable only for user data. Not to peamble

cfgSU.HELTFType =1;

cfgSU.GuardInterval = 0.8;

cfgSU.APEPLength=0;% Data field carry PSDU's. Specify PSDU length

fs = wlanSampleRate(cfgSU); % Get baseband sample rate% 20MHz=BW

ind=wlanFieldIndices(cfgSU);

chanBW = cfgSU.ChannelBandwidth;%default 20MHz channel

psdu = randi([0 1], getPSDULength(cfgSU)*8, 1); % Create a PSDU, getPSDULength(cfgSU)=100 bytes

txWaveform10 = wlanWaveformGenerator(psdu,cfgSU); % Disable windowing);

txWaveform10=txWaveform10/8.5524; %Do appropriate scaling. But still the alternate values are negated.

ind = wlanFieldIndices(cfgSU);

LLTF_transmitted = txWaveform10((ind.LLTF(1):ind.LLTF(2)), :);

%%%%%%%%%%%%%%%%% PILOT symbols

disp('BPSK modulated LLTF constellation symbol points(known training constellation symbol)')

%LLTF(Legacy Long training field) constellation symbols specified by the IEEE 802.11ax standard, values prior to IIFT at txer

lltfLower = [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;];

lltfUpper = [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]; %has 52 populated subcarriers before performing IFFT

% Add null subcarriers to the populated subcarriers

LLTF_BPSK = [zeros(6,1); lltfLower; 0; lltfUpper; zeros(5,1)];

% first 6 Subcarriers , central subacriier and last 5 subcarriers are Null % subcarriers. In total there are 12 null subcarriers and 52 populated subcarriers

Lk=LLTF_BPSK.';

%%%%%%%%%%%%%%%%% IFFT at the Transmitter

xn=ifft(Lk,64);%

%************** Addition of CP in time domain

txWaveform12=[xn(33:64) xn xn].';% txed waveform with Cyclic prefix(=32 samples) added in time-domain before passing to channel

%@@@@@@@@@@@ comparing LLTF_transmitted and txWaveform12

LLTF_transmitted;% = txWaveform((ind.LLTF(1):ind.LLTF(2)), :); from wlanwaveform generator output

% txWaveform12=LLTF_transmitted;

compare22=[txWaveform12 LLTF_transmitted ] % LLTF_transmitted=8.5524*txWaveform12 and with alternate SYMBOLS negated!!!!!!!!