Filtered decision feedback channel estimation for OFDM-based DTV terrestrial broadcasting system
Orthogonal frequency division multiplexing (OFDM) is one of the transmission techniques used for digital television (DTV) terrestrial broadcasting. A high quality channel estimator with a low training overhead is the key to the successful delivery of DTV services which require high spectrum efficien...
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| Veröffentlicht in: | IEEE transactions on broadcasting Jg. 44; H. 1; S. 2 - 11 |
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| Format: | Journal Article |
| Sprache: | Englisch |
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New York, NY
IEEE
01.03.1998
Institute of Electrical and Electronics Engineers |
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| ISSN: | 0018-9316 |
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| Abstract | Orthogonal frequency division multiplexing (OFDM) is one of the transmission techniques used for digital television (DTV) terrestrial broadcasting. A high quality channel estimator with a low training overhead is the key to the successful delivery of DTV services which require high spectrum efficiency and robustness to strong and dynamic ghosts. Robustness to multipath distortion is especially important in a single frequency emission environment. This paper presents an application of a filtered decision feedback channel estimator for OFDM-based DTV systems using high order QAM modulations. The implementation and the performance of the channel estimator are discussed. Computer simulations were conducted to evaluate the performance of the channel estimator. The channel estimation loss is about 1.2 dB from the ideal case where the channel is assumed to be known by the receiver. For a given multipath spread, the loss can be further reduced by increasing the FFT size. The FFT size is however subject to an upper limit imposed by the Doppler spread. |
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| AbstractList | Orthogonal frequency division multiplexing (OFDM) is one of the transmission techniques used for digital television (DTV) terrestrial broadcasting. A high quality channel estimator with a low training overhead is the key to the successful delivery of DTV services which require high spectrum efficiency and robustness to strong and dynamic ghosts. Robustness to multipath distortion is especially important in a single frequency emission environment. This paper presents an application of a filtered decision feedback channel estimator for OFDM-based DTV systems using high order QAM modulations. The implementation and the performance of the channel estimator are discussed. Computer simulations were conducted to evaluate the performance of the channel estimator. The channel estimation loss is about 1.2 dB from the ideal case where the channel is assumed to be known by the receiver. For a given multipath spread, the loss can be further reduced by increasing the FFT size. The FFT size is however subject to an upper limit imposed by the Doppler spread. Orthogonal frequency division multiplexing (OFDM) is one of the transmission techniques used for digital television (DTV) terrestrial broadcasting. A high quality channel estimator with a low training overhead is the key to the successful delivery of DTV services which require high spectrum efficiency and robustness to strong and dynamic ghosts. Robustness to multipath distortion is especially important in a single frequency emission environment. This paper presents an application of a filtered decision feedback channel estimator for OFDM-based DTV systems using high order QAM modulations. The implementation and the performance of the channel estimator are discussed. Computer simulations were conducted to evaluate the performance of the channel estimator. The channel estimation loss is about 1.2 dB from the ideal case where the channel is assumed to be known by the receiver. For a given multipath spread, the loss can be further reduced by increasing the FFT size. The FFT size is however subject to an upper limit imposed by the Doppler spread |
| Author | Chini, A. Yiyan Wu El-Tanany, M. Mahmoud, S. |
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| Cites_doi | 10.1109/11.286287 10.5594/M001264 10.1016/0923-5965(93)90004-D 10.1109/GLOCOM.1992.276674 10.1109/11.286291 |
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| Keywords | Parameter estimation Function block diagram Feedback Digital television A posteriori estimation Transmission channel Cable television System identification Frequency division multiplexing Digital transmission |
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| References | ref11 gledhill (ref2) 1991 helard (ref1) 1991 chini (ref13) 1994 lodge (ref6) 1992 weiss (ref4) 1992 marti (ref8) 1993 wu (ref14) 1996 monnier (ref3) 1992 wu (ref12) 1994; 40 ref7 gledhill (ref10) 1993 ref5 appelquist (ref9) 1993 |
| References_xml | – volume: 40 start-page: 75 year: 1994 ident: ref12 article-title: Evaluation of Channel Coding, Modulation and Interference of Digital ATV Terrestrial Transmission Systems publication-title: IEEE Trans on Broadcasting doi: 10.1109/11.286287 – year: 1996 ident: ref14 article-title: Results of Laboratory and Field Tests of an OFDM Modem for ATV Transmission in 6 MHz channels publication-title: Proc Int Workshop on HDTV doi: 10.5594/M001264 – start-page: 14 year: 1992 ident: ref4 article-title: design of an hdtv codec for terrestrial transmission at 25 mbit/s publication-title: Broadcasting Convention 1992 IBC International – start-page: 34 year: 1992 ident: ref6 article-title: A rugged and flexible digital modulation scheme for terrestrial high definition television publication-title: EBU Technical Review – start-page: 785 year: 1991 ident: ref1 article-title: Trellis Coded Orthogonal Frequency Division Multiplexing for Digital Video Transmission publication-title: IEEE GLOBECOM 91 – ident: ref7 doi: 10.1016/0923-5965(93)90004-D – start-page: 380 year: 1992 ident: ref3 article-title: Digital Television Broadcasting with High Spectral Efficiency publication-title: Broadcasting Convention 1992 IBC International – ident: ref5 doi: 10.1109/GLOCOM.1992.276674 – start-page: 2/1 year: 1993 ident: ref10 article-title: ofdm for digital terrestrial television publication-title: IEE Colloquium on Digital Terrestrial Television (Digest No 1993/210) – start-page: 20 year: 1993 ident: ref8 article-title: European activities on digital television broadcasting from company to cooperative projects publication-title: EBU Technical Review – start-page: 175 year: 1991 ident: ref2 article-title: The Transmission of Digital Television in the UHF Band using Orthogonal Frequency Division Multiplexing publication-title: IEE Sixth Int Conf on Digital Processing of Signals in Comm – ident: ref11 doi: 10.1109/11.286291 – year: 1994 ident: ref13 publication-title: Multi carrier modulation in frequency selective fading channels – start-page: 16 year: 1993 ident: ref9 article-title: HD-DIVINE, a Scandinavian terrestrial HDTV project publication-title: EBU Technical Review |
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| SubjectTerms | Applied sciences AWGN Broadcasting Broadcasting. Videocommunications. Audiovisual Channel estimation Decoding Digital TV Exact sciences and technology Feedback Low pass filters Multipath channels Nonlinear filters Signal to noise ratio Telecommunications Telecommunications and information theory Television |
| Title | Filtered decision feedback channel estimation for OFDM-based DTV terrestrial broadcasting system |
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