Combined modulation and error correction decoder for TDMR using generalized belief propagation

Mehrdad Khatami, Bane Vasić

Research output: Contribution to journalConference articlepeer-review

Abstract

Constrained codes also known as modulation codes are a key component in the digital magnetic recording systems. The constrained codes forbid particular input data patterns which lead to some of the dominant error events or higher media noise. In data recording systems, a concatenated approach toward the constrained code and error-correcting code (ECC) is typically used and the decoding is done independently. In this paper, we show the improvement in combining the decoding of the constrained code and the ECC using generalized belief propagation (GBP) algorithm. We consider the performance of a combined modulation constraints and the ECC on a binary symmetric channel (BSC). We show that combining demodulation and decoding results in a superior performance compared to concatenated schemes. Furthermore, we compute the capacity of the joint ECC and modulation codes for 1-D and 2-D constraints.

Original languageEnglish (US)
JournalProceedings of the International Telemetering Conference
Volume49
StatePublished - Dec 1 2013
EventITC/USA 2013: 49th Annual International Telemetering Conference and Technical Exhibition - Meeting all the Challenges of Telemetry, 2013 - Las Vegas,NV, United States
Duration: Oct 21 2013Oct 24 2013

Keywords

  • Constrained codes
  • Error-control codes (ECCs)
  • Joint decoder/demodulator
  • Reverse concatenation

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Instrumentation
  • Computer Networks and Communications
  • Signal Processing

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