Symbol discriminator for high-density multilevel recording

John M. Gerpheide; Amit K. Jain

doi:10.1117/12.218737

8 September 1995 Symbol discriminator for high-density multilevel recording

John M. Gerpheide, Amit K. Jain

Proceedings Volume 2514, Optical Data Storage '95; (1995) https://doi.org/10.1117/12.218737
Event: Optical Data Storage '95, 1995, San Diego, CA, United States

Abstract

We consider the design and analysis of read-back symbol discriminator for multilevel codes on an electron trapping optical memory recording channel. The linear amplitude response of this new media provides a method of increasing the density of stored data by using multilevel or M-ary runlength limited (RLL) channel codes. In this paper, we consider the problem of symbol detection for a high density M-ary channel that encodes 3 user data bits per minimum sized feature to achieve a maximum channel capacity of 3.4 bits/sec/Hz. A dynamic model of the optical/electronic read channel is constructed to generate the expected amplitude waveform. These signals are discriminated by a maximum likelihood detector that operates on a small number of quantized amplitude values. Another model is constructed to study the effect of signal amplitude quantization on the error performance for M-ary RLL channel codes. Included in the analysis are the effects due to variations in the offset of both sampling phase and amplitude levels. Comparisons of the proposed symbol detection method are presented for two different M-ary RLL channels operating at user data rates from 25 Mbits/sec to 68 Mbits/sec.

Citation Download Citation

John M. Gerpheide and Amit K. Jain "Symbol discriminator for high-density multilevel recording", Proc. SPIE 2514, Optical Data Storage '95, (8 September 1995); https://doi.org/10.1117/12.218737

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available