DocumentCode :
1409597
Title :
Coded modulation and precoding for electron-trapping optical memories
Author :
Calderbank, A. Robert ; Laroia, Rajiv ; McLaughlin, Steven W.
Author_Institution :
Inf. Sci. Res. Center, AT&T Labs., Florham Park, NJ, USA
Volume :
46
Issue :
8
fYear :
1998
fDate :
8/1/1998 12:00:00 AM
Firstpage :
1011
Lastpage :
1019
Abstract :
This paper develops coding and signal processing approaches for a novel optical recording channel that arises from electron-trapping phosphor materials. The recording medium allows multiple reads and writes, and one important feature is that the read process serves to erase the disk. This feature would enable vendors of prerecorded video to provide customers with one-time services. For applications where this feature is not desirable, the data can be immediately rewritten. From a communications viewpoint, the most important feature of this new channel is that, subject to a peak constraint, it supports a continuum of recording levels. The combination of read and write processes creates a partial-response channel, and the ability to write a continuum of levels makes it possible to employ precoding techniques, such as the one developed by Tomlinson (1971) and by Miyakawa and Harashima (1969). This is fundamentally different from magnetic data storage, where the read/write process creates a partial-response channel but where it is only possible to write two levels at the input to that channel. This paper shows that the use of precoding and coset codes can significantly improve upon the recording densities (and recording rates) that can be achieved by using M-ary run length constrained codes to eliminate intersymbol interference (ISI) at the output of the read/write process. The approach presented is applicable to any optical recording channel that supports a continuum of recording levels
Keywords :
electron traps; interference suppression; intersymbol interference; modulation coding; optical disc storage; partial response channels; runlength codes; signal processing; trellis codes; ISI elimination; M-ary run length constrained codes; coded modulation; communications; coset codes; disk erasure; electron-trapping optical memories; electron-trapping phosphor materials; intersymbol interference; one-time services; optical recording channel; partial-response channel; peak constraint; precoding; prerecorded video; read process; recording densities; recording levels; recording rates; signal processing; trellis coding; write process; Intersymbol interference; Magnetic recording; Modulation coding; Optical materials; Optical modulation; Optical recording; Optical signal processing; Phosphors; Video recording; Video signal processing;
fLanguage :
English
Journal_Title :
Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
0090-6778
Type :
jour
DOI :
10.1109/26.705399
Filename :
705399
Link To Document :
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