On the redundancy of Slepian--Wolf coding

  • Authors:
  • Da-Ke He;Luis A. Lastras-Montaño;En-Hui Yang;Ashish Jagmohan;Jun Chen

  • Affiliations:
  • RIM, SlipStream, Waterloo, ON, Canada and IBM Thomas J. Watson Research Center, Yorktown Heights, NY;IBM T. J. Watson Research Center, Yorktown Heights, NY;Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ON, Canada;IBM T. J. Watson Research Center, Yorktown Heights, NY;Department of Electrical and Computer Engineering, McMaster University, Hamilton, ON, Canada and IBM T. J. Watson Research Center, Yorktown Heights, NY

  • Venue:
  • IEEE Transactions on Information Theory
  • Year:
  • 2009

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Abstract

In this paper, the redundancy of both variable and fixed rate Slepian-Wolf coding is considered. Given any jointly memoryless source-side information pair {(Xi, Yi)}i=1∞ with finite alphabet, the redundancy Rn(Ɛn) of variable rate Slepian-Wolf coding of X1n with decoder only side information Y1n depends on both the block length n and the decoding block error probability Ɛn, and is defined as the difference between the minimum average compression rate of order n variable rate Slepian-Wolf codes having the decoding block error probability less than or equal to Ɛn, and the conditional entropy H(X|Y), where H(X|Y) is the conditional entropy rate of the source given the side information. The redundancy of fixed rate Slepian-Wolf coding of X1n with decoder only side information Y1n is defined similarly and denoted by RFn(Ɛn). It is proved that under mild assumptions about Ɛn, Rn(Ɛn) = dv√- log Ɛn/n + o(√- log Ɛn/n) and RFn(Ɛn) = df√- log Ɛn/n + o(√- log Ɛn/n), where df and dv are two constants completely determined by the joint distribution of the source-side information pair. Since dv is generally smaller than df, our results show that variable rate Slepian-Wolf coding is indeed more efficient than fixed rate Slepian-Wolf coding.