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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Vydáno v:IEEE transactions on broadcasting Ročník 44; číslo 1; s. 2 - 11
Hlavní autoři: Chini, A., Yiyan Wu, El-Tanany, M., Mahmoud, S.
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York, NY IEEE 01.03.1998
Institute of Electrical and Electronics Engineers
Témata:
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
Parameter estimation
Function block diagram
Feedback
Digital television
A posteriori estimation
Transmission channel
Cable television
System identification
Frequency division multiplexing
Digital transmission
ISSN:0018-9316
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Popis
Shrnutí: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.
Bibliografie:ObjectType-Article-2
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ISSN:0018-9316
DOI:10.1109/11.713051