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.
Highlights
One of the fundamental issues in any communication system is achieving the reliable delivery of data between a sender and a receiver over an unreliable channel
Based on the above literature review, we find that the following are the issues that need to be resolved in the existing Conventional Degree Distribution (CDD) functions designed for Luby Transform (LT) codes in order to achieve the optimal performance of the communication system:
The performance of LT codes using CDD and proposed Joint Degree Distribution (JDD) are studied for transmission over Additive White Gaussian Noise (AWGN) channel using Binary Phase Shift Keying (BSPK) as the modulation scheme
Summary
One of the fundamental issues in any communication system is achieving the reliable delivery of data between a sender and a receiver over an unreliable channel. Automatic Repeat Request (ARQ) is an error control technique that allows the receiver to detect the errors in the received message and request the sender for the retransmission of the erroneous message. These message retransmissions causes more delay and may not be found suitable for cellular and real-time multimedia broadcasting applications (Eduardo et al, 2010). It becomes necessary to achieve the maximum throughput over the time-varying channels
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