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1 OFDMOrthogoal Frequecy Divisio Multiplexig OFDM LSI DSP OFDM DAB: Digital Audio Broadcastig OFDM LAPAADSL OFDM itami@te.oda.tus.ac.jp Makoto ITAMI, Member Departmet of Applied Electroics, Tokyo Uiversity of Sciece, oda-shi, 78-85, Japa. Fudametals Review Vol. o. pp OFDM OFDM OFDM S B t D e jf t f D f QPSK QAM OFDM T e = /f T e = /f =6= S B (t) 6 = f QPSK T e = /f f Fudametals Review Vol. o. 35
2 OFDM OFDM /f DFT 3 OFDM IDFT DFT f DFT IDFT FFT Fast Fourier Trasform: LSI DFT T e OFDM OFDM OFDM S B (t) S B (t) DFTDiscrete Fourier Trasform: OFDM /(f ) S B,k = (k/(f )) T e = /f OFDM OFDM OFDM OFDM s(t) OFDM jf ct st Re S te B a cos f f t b si f f t c c S B, k S B k f f j k f De D e k j k,, L, D ( =,,, ) IDFT Iverse Fourier Trasform: S B,k (k =,, ) D ( =,, ) IDFT /(f ) OFDM S B (t) 36 Fudametals Review Vol. o.
![OFDM Re[Z] ] Zf c f c+( )f D D = a + j b a, b 3](/docs-images/91/106581916/images/3-0.jpg "OFDM OFDM DFT OFDM OFDM OFDM OFDM 3 f OFDM OFDM 4")
3 OFDM Re[Z] ] Zf c f c+( )f D D = a + j b a, b 3 OFDM OFDM DFT OFDM OFDM OFDM OFDM 3 f OFDM OFDM 4 OFDM OFDM DFT. 5 DFT OFDM OFDM SFSigle Frequecy etwork: LA OFDM (f) ) r(t) Fudametals Review Vol. o. 37
4 r(t) f =f c+f φ(f )=arg(f ) w(t) 4 OFDM r(t) cos(πf ct) r (t) r t f a cos f t f b si f t f w t I r(t) si(πf ct r Q(t) r Q t f a si f t f b cos f t f w t r (t) r Q(t) R(t) R t r t jr t I j f t f f a jb e Wt f Q D e jf t W t 7 OFDM D (f )D R(t) DFT DFT X Q I 8 8 ZFZero Forcig(f ) D X Dˆ f Z D f 9 ZF MMSEMiimum Mea Square ErrorMMSE Dˆ EZ Dˆ f * X f E Z Z MMSE ZF OFDM 6 7 X f D Z, L, 8 Z DFT 8 DFT 38 Fudametals Review Vol. o.
5 OFDM OFDM 45 OFDM FFT T G+/f T G OFDM OFDM f c 3 f OFDM OFDM OFDM OFDM OFDM /f 8 R(t) /f 9 IEEE8.a IEEE8.a OFDM 58 OFDM 9 LA LA Fudametals Review Vol. o. 39
6 DPSK DPSK OFDM DQPSK OFDM 8 OFDM OFDM OFDM OFDM OFDM DFT OFDM MIMOMultiple Iput Multiple Output OFDM MIMO-OFDM IEEE8. OFDM OFDM LA LDPC OFDM OFDM CDMA MC/CDMAMulti Carrier/ Code Divisio Multiple Access OFDM 4 Fudametals Review Vol. o.
7 OFDM PAPR: Peak to Average Power Ratio OFDM OFDM OFDM OFDM PAPR OFDM PAPR OFDM PAPR 3 4 OFDM SF OFDM OFDM OFDM Fudametals Review Vol. o. 4
8 99 OFDM DABDigital Audio Broadcastig DVB-T 9 OFDM ISDB-T: Itegrated Service Digital Televisio TerrestrialISDB-T DVB-T ISDB-T 3 BST-OFDM Bad Segmeted OFDM DVB-T BST-OFDM ISDB-T 3 ISDB-T SF OFDM 6 BST- OFDM DVB-T DVB-M m LA.4Gz DS/SS IEEE8.b F/SS Bluetooth LA ODFM 5Gz IEEE8.a.4Gz IEEE8.g Mz OFDM 54Mbit/s IEEE8.a IEEE8.g IEEE8.g IEEE8.b MIMO IEEE8. 3 4Mbit/s 4Mz 3Mbit/s 6Mbit/s LA WiMAX 4 WiMAX IEEE8.6 OFDM km 75Mbit/s IEEE8.6d,3km 75Mbit/s IEEE8.6e WiMAX OFDMA MIMO flash-ofdm flash-ofdm IEEE8. 5 OFDM.5Mz FDD 3Mbit/s 9Kbit/s flash-ofdm LDPC 3m PA PC IEEE8.5.3a WiMedia 6 WiMedia UWB USB OFDM OFDM 8 58Mz 48Mbit/s 4 Fudametals Review Vol. o.
9 OFDM OFDM Mbit/s omeplug AV 7 poit-to-poit ADSL OFDM ADSL poit-to-poit W-CDMA 3G Mbit/s Super 3G OFDMA Mbit/s4G OFDM R. W. Chag, Sythesis of bad-limited orthogoal sigals for multi-chael data trasmissio, BSTJ, vol.45, o. pp , 966. R. W. Chag ad R. A. Gabby, A theoretical study of performace of a orthogoal multiplexig data trasmissio scheme, IEEE Tras. Commu., vol.6, o. pp.59-54, S. B. Weistei ad P. W. Ebert, Data trasmissio by frequecydivisio multiplexig usig the discrete fourier trasform, IEEE Tras. Commu., vol.9, pp , T. M. Schmidl ad D. C. Cox, Robust frequecy ad timig sychroizatio for OFDM, IEEE Tras. Commu., vol.45, o., pp.63-6, OFDM,, 6 B. irosaki, A aalysis of automatic equalizers for orthogoally multiplexed QAM systems, IEEE Tras. Commu., vol.8, o. pp.73-83, V. Migoe, A. Morello ad M. Visuti, CD-3: A ew chael estimatio ethod to improve the spectrum efficiecy i digital terrestrial televisio system, IEE Cof. Publ., 43, o., pp.-8, M. Alard ad R. Lassalle, Priciples of modulatio ad chael codig for digital broadcastig for mobile receivers, EEU Review- Techical, 4, pp.68-9, ETSI, Digital broadcastig system for televisio, soud ad data services; framig structure, chael codig ad modulatio for digital terrestrial televisio, Draft prets 3 744, 996. ARIB STD-B3,, IEEE Std 8.a-999, Part : Wireless LA medium access cotrolmacad physical layerpyspecificatios: ightspeed physical Layer i the 5 Gz bad, 999. IEEE Std 8.g-3, Part : Wireless LA medium access cotrolmacad physical layerpyspecificatios: Amedmet 4: further higher data rate extesio i the.4 Gz bad, 3. 3IEEE8., 4WiMax, 5flash-OFDM, 6WiMedia Alliace, 7ome Plug Powrlie Alliace, OFDM OFDM OFDM CDMA OFDMITS Fudametals Review Vol. o. 43
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