sefade.m
上传用户:m_sun_001
上传日期:2014-07-30
资源大小:1115k
文件大小:2k
- % Program 2-6
- % sefade.m
- %
- % This function generates frequency selecting fading
- %
- % Programmed by H.Harada
- %
- function[iout,qout,ramp,rcos,rsin]=sefade(idata,qdata,itau,dlvl,th,n0,itn,n1,nsamp,tstp,fd,flat)
- %****************** variables *************************
- % idata input Ich data
- % qdata input Qch data
- % iout output Ich data
- % qout output Qch data
- % ramp : Amplitude contaminated by fading
- % rcos : Cosine value contaminated by fading
- % rsin : Cosine value contaminated by fading
- % itau : Delay time for each multipath fading
- % dlvl : Attenuation level for each multipath fading
- % th : Initialized phase for each multipath fading
- % n0 : Number of waves in order to generate each multipath fading
- % itn : Fading counter for each multipath fading
- % n1 : Number of summation for direct and delayed waves
- % nsamp : Total number od symbols
- % tstp : Mininum time resolution
- % fd : Maxmum doppler frequency
- % flat flat fading or not
- % (1->flat (only amplitude is fluctuated),0->nomal(phase and amplitude are fluctutated)
- %******************************************************
- iout = zeros(1,nsamp);
- qout = zeros(1,nsamp);
- total_attn = sum(10 .^( -1.0 .* dlvl ./ 10.0));
- for k = 1 : n1
- atts = 10.^( -0.05 .* dlvl(k));
- if dlvl(k) >= 40.0
- atts = 0.0;
- end
- theta = th(k) .* pi ./ 180.0;
- [itmp,qtmp] = delay ( idata , qdata , nsamp , itau(k));
- [itmp3,qtmp3,ramp,rcos,rsin] = fade (itmp,qtmp,nsamp,tstp,fd,n0(k),itn(k),flat);
-
- iout = iout + atts .* itmp3 ./ sqrt(total_attn);
- qout = qout + atts .* qtmp3 ./ sqrt(total_attn);
- end
- % ************************end of file***********************************