NDLI: Qualitative analysis of the impact of clock timing error and/or frequency offsets on an OFDM waveform demodulator

Content Provider	IEEE Xplore Digital Library
Author	Roberts, R.D.
Copyright Year	1996
Description	Author affiliation: Harris Semicond., Palm Bay, FL, USA (Roberts, R.D.)
Abstract	Orthogonal frequency division multiplexing (OFDM) is a discrete multitone (DMT) waveform that is used on dispersive channels such as the subscriber twisted pair associated with asymmetric digital subscriber line (ADSL) or with digital television terrestrial broadcasting (DTTB). Implementation is based upon the IFFT for modulation and the FFT for demodulation. Orthogonality is obtained by having the DMT carrier spacing the same as the baud rate, and having the FFT demodulation process accumulate over exactly one baud symbol. However, orthogonality can only occur if the demodulator clock is synchronized to the modulator and no frequency offsets are present. This paper discusses, in a qualitative manner, the impact of attempting to FFT demodulate the OFDM waveform if clock synchronization has not occurred and/or if frequency offsets have accumulated on the channel.
Starting Page	80
Ending Page	85
File Size	283479
Page Count	6
File Format	PDF
ISBN	0780332687
ISSN	10878785
DOI	10.1109/SOUTHC.1996.535047
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-06-25
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Clocks Timing OFDM modulation Demodulation Frequency synchronization Dispersion DSL Digital TV TV broadcasting Frequency modulation
Content Type	Text
Resource Type	Article

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