Research Article Open Access

Performance Analysis of Joint Degree Distribution (JDD) in Luby Transform Codes

I. Joe Louis Paul1, S. Radha1 and J. Raja1
  • 1 , India
Journal of Computer Science
Volume 11 No. 1, 2015, 166-177

DOI: https://doi.org/10.3844/jcssp.2015.166.177

Submitted On: 2 March 2014 Published On: 13 August 2014

How to Cite: Paul, I. J. L., Radha, S. & Raja, J. (2015). Performance Analysis of Joint Degree Distribution (JDD) in Luby Transform Codes. Journal of Computer Science, 11(1), 166-177. https://doi.org/10.3844/jcssp.2015.166.177

Abstract

Luby Transform (LT) codes, the first realization of rateless codes are widely used in wireless communication mainly for its adaptability to varying channel conditions and its capacity approaching performance. In spite of the above advantages and its simplicity in implementation, LT codes suffer from a bottle neck of premature termination due to the poor design of degree distribution. In this study, a novel degree distribution called Joint Degree Distribution (JDD) is proposed for the successful completion of LT encoder/decoder processes. The efficient utilization of the bandwidth is tried to be achieved by using only 'k' encoded symbols for 'k' source symbols, unlike in traditional systems. JDD is carefully designed to ensure that the encoding/decoding delay does not exceed that which is existent in the traditional systems. The performance of JDD for throughput and bit error rate, experimented over Additive White Gaussian Noise (AWGN) channel compared to conventional degree distribution was observed to be much better.

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Keywords

  • LT Codes
  • Rateless Codes
  • Joint Degree Distribution
  • AWGN Channel