Tran annna vry fr D-A w frqny-an qazan Kaza TAKDA an Fy ADACI Dp. f ra an Cnan ngnrng, Graa f ngnrng, T nvry Cnn Bagrn & Obv Tran annna vry fr D-A w FD a Inr-p nrfrn afr -FD ICI anan Tra wr-bn a B prfran Cnn Bagrn /3 Fr nx gnran wr nan y, g aa-ra rv ar an. T wr ann b vry frqnyv. D-A a bnng 3G B graan rng nr-pa nrfrn IPI -FD [] Br B prfran an ra bnng Lw pxy par w L. [] F. Aa, D. Garg,. Taaa, an K. Taa, A I r Cn. ag., V.,., pp. 8-8, Apr. 5. Cann gan f, B 3 Bagrn /3 a nr-p nrfrn ICI Dr rgnay ang prang fr D-A. Dgra B prfran a nbr f px rr nra. r nrfrn anan nq av bn fr D-A [], [3]. Frqny-an ICI anan [] prv B prfran f D-A/-FD gnfany... 5 5 5 barrr nx [] K. g, K. Oawa,. awaa an F. Aa, xprn n p yb-a rn ag nrfrn anr n D-A rvr IIC Tran. Cn., V.86-B,., pp.9-5, Jan. 3. [3]. Tan an v Bnvn, r pxy b rav DF fr prv wr Pr. I fa, p.. [] K. Taa, K. Iara, an F. Aa, D-A rann w n qazan an ICI Pr. I VTC 6-prng, brn, Araa, 7- ay 6.
Bagrn 3/3 T frr prv B prfran, ran annna vry nq ffv. Cy ay ran vry TD [5] Prp fr C-A Larg frqny vry gan D-A/-FD pa- ran vry [6] Annna vry gan pa- ng I wa wn a appan f D-A/-FD prv a br B prfran an TD [7]. Obv. w a B prfran graan f TD fr any ra ICI. pr ra ICI an TD n frqny-vy an b ppr by annna vry ff.. w a nrn f ICI anan n D- A/-FD an prv a a B prfran fr an TD. T nfr by pr an an by ra anay. [5] A. Daann an. Kar, nfrab annna vry nq fr OFD y an appan DVB-T Pr. I Gb, pp. 335, vbr. [6].. Aa, p ran vry nq fr wr I J.. Ara Cn., V.6,.8, pp.5-58, O. 998. [7]. Kawa, a., " pa- y ay ran vry fr a - D-A gna w frqny-an qazan," IIC Tran. Cn., V.9-B.3, pp. 59-596, ar. 7. 5 6 D-A Tranr ng TD D-A rvr ng -FD Tranr Daa Daa an prang /P nvrr 3 5 6 7 Cpy. + Cy ay Inrn f GI Inrn f GI # # vr va f GI -pn FFT FD -pn IFFT prang Cpy Daa an frqny pnn f rv p b = P/ nvrr vr Daa Tran gna n n : Tran p b : FFT wnw z 6 7 3 5 7 L n n, n xp 8
-FD -FD wg 9 On-ap FD = qvan ann gan afr -FD IFFT p = r a ICI Dr gna ZF-FD wg IFFT p = r ZF nann Tw p b D-A Tranr ng Tranr Daa an Daa nr Inrn f GI Inrn f GI prang n p b K. Taa, T. Iaga, an F. Aa, f pa ran vry ng-arrr rann w frqny-an qazan an rv annna vry n a frqny-v fang I Prng Cnan, v. 5,.6, pp.67-63, D.. xp xp -pn FFT -pn IFFT -pn IFFT T annna n annna vn O T-an nr D-A rvr ng -FD & ng frqny pnn f rv p b vr -pn FFT Jn -FD an ng -pn IFFT Daa an prang vr Daa xp, r r L -FD & ng -FD wg bn w ng -FD & ng r r T qvan ann gan afr -FD an ng
a ICI / qvan ann gan afr -FD T a ICI n frqny an fr TD T T fr 3 a ICI / qvan ann gan B a ICI, 5-5 - -5 - -5-3 5 5 5 Frqn nx...8.6.. a qvan ann gan afr -FD TD 5 5 5 Frqny nx b a ICI TD b / =B L=6 pa nfr pwr ay prf =56 = 5 Avrag B B prfran.-.-.-3.- w/ ICI anan QPK =56, g =3 ==6 L=6, =5 B.-5 5 5 Avrag rv b / B = TD In a wa frqny-v ann, TD an prv B prfran. prfr br an TD. an ppr frqny-vy an rby rng ra ICI. T prfran gap any ra ICI. vr ng ICI anan vr rr -pn FFT wg pan & ICI rpa gnran -pn IFFT -pn FFT prang Iran prang LL pan f rpa gnran Day Daa an vr Daa 6
7 FD & ICI anan TD,,,, FD ICI anan FD & ng ICI anan -FD wg fr ICI anan / 8 TD / an an ra ICI p na. nra an an ra ICI ffny ppr. g b C-FD wg f yb rpa -FD wg fr ICI anan / 9, /, Tra wr-bn f B /3 gna--n pwr ra Prf ICI anan f C-FD wg fr fr TD T, r r, xp xp L n L n n
Tra wr-bn f B /3 T TD Frqny vry gan L n = n, Cnna B fr QPK an p b rf, n, r T Frqny vry gan + Annna vry gan an nn Tranr Cann vr an QPK. f FFT pn =56 GI prang qn prang far Fang Pwr ay prf Day far g =3p Pr f a qn an P qn ==6 B ayg fang L=6-pa xpnna ay pwr ay prf = an 5 B Cann an Ia. f ran = an 3 Cann B T 5T T : Cp ran Day B prfran = B.-.- w/ ICI anan QPK =56, g =3 ==6 L=6, = B.-.- w/ici anan QPK =56, g =3 ==6 L=6, = B 3 B prfran =5 B.-.-.-.- w/ici anan QPK =56, g =3 ==6 L=6, =5 B Avrag B.-3.- TD =.-5 5 5 Avrag rv b / B a w/ ICI anan = Avrag B.-3.-.-5 5 5 Avrag rv b / B b w/ ICI anan =3 TD Lwr bn w/ ICI anan : Annna vry ff by argr an frqny vry ff by TD. w/ ICI anan : ICI anan prv a a B prfran fr TD an. Avrag B.-3.- w/ ICI anan QPK =56, g =3 ==6 L=6, =5 B = TD.-5 5 5 Avrag rv b / B a w/ ICI anan = Avrag B.-3.- = TD Lwr bn.-5 5 5 Avrag rv b / B b w/ ICI anan =3 TD an prv B prfran n a wa frqny-v ann. w/ ICI anan : prfr br an TD. w/ ICI anan : Prfran prvn f =, annna vry + frqny vry gan fr an frqny vry gan fr TD. = =
Cnn / In D-A/-FD, prv a br B prfran an TD. In a, w w a prfran graan f TD fr r fr ra ICI afr -FD. w a nrn f ICI anan gv a a B prfran fr TD an. prf ICI anan, frqny vry gan av by TD b a a frqny vry gan + annna vry gan av by. TD Frqny vry gan = Frqny vry gan + Annna vry gan 5 Cnn / T wa nfr by pr an. Fr a rng frqny-v ann.., = B, ny a g prfran prvn ban by TD an. Fr a wa frqny-v ann.., =5 B, b TD an w ICI anan an prv B prfran gnfany. n =, ICI anan an r rqr b / fr B= by a a 6Bfr an 5.5 B fr TD par ng ran annna a =. 6