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Performance Evaluation of WiMAX/IEEE 802.16 OFDM Physical Layer - page 102 / 107

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%%% derived OFDM symbol parameter

IEEE80216params.Ofdm.Nfft=256; % smallest power of 2 greater than Nused %sampling frequency IEEE80216params.Ofdm.Fs=floor((IEEE80216params.Ofdm.n*IEEE80216params.Ofdm.BW)/8000)*800 0; %subcarrier spacing IEEE80216params.Ofdm.del_f=IEEE80216params.Ofdm.Fs/IEEE80216params.Ofdm.Nfft; %useful symbol time IEEE80216params.Ofdm.Tb=1/(IEEE80216params.Ofdm.del_f); %CP time IEEE80216params.Ofdm.Tg=IEEE80216params.Ofdm.G*IEEE80216params.Ofdm.Tb; %symbol time IEEE80216params.Ofdm.SymbolTime=IEEE80216params.Ofdm.Tg+IEEE80216params.Ofdm.Tb; %sampling time IEEE80216params.Ofdm.SampleTime=IEEE80216params.Ofdm.Tb/IEEE80216params.Ofdm.Nfft; %number of pilot carrier IEEE80216params.Ofdm.Npilot=8; %number of data carrier IEEE80216params.Ofdm.Ndata=IEEE80216params.Ofdm.Nused­ IEEE80216params.Ofdm.Npilot;

%MAPPING Parameters : full subchannelization IEEE80216params.Map.DataSubCars=[29:40 42:65 67:90 92:115 117:128 130:141 143:166 168:191 193:216 218:229]; IEEE80216params.Map.PilotSubCars=[41 66 91 116 142 167 192 217]; IEEE80216params.Map.GuardSubCars=[1:28 230:256]; IEEE80216params.Map.UsedSubCars=[29:128 130:229];

% Link Parameters IEEE80216params.Link.direction='Dlink'; %always model applies to this IEEE80216params.Link.DIUC=7; IEEE80216params.Link.BSID=1; IEEE80216params.Link.FrameNo=1 % transmission start from frame number 1 IEEE80216params.Link.Frames=250; % number of frames to be sent IEEE80216params.Link.FrameTime=4*10^(­3);

IEEE80216params.Link.Alloc_frac=0.1; IEEE80216params.Link.BurstTime=IEEE80216params.Link.Alloc_frac*IEEE80216params.Link.FrameTi me % RS encoder parameter IEEE80216params.RS.generator=rsgenpoly(255,239,[],0); %RS field and code generator

%CC encoder parameter IEEE80216params.CC.trellis=poly2trellis(7,[171 133]);% CC trellis as per specification IEEE80216params.CC.tblen=32; %the traceback length

%MODULATION params IEEE80216params.Modulation.subchn=16; %full subchannelization %gray coded mappings graymap_16=[ '1101' '1100' '1110' '1111' '1001' '1000'

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