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HARQ Aided Systematic LT Coding for Amplify-Forward and Decode-Forward Cooperation

Summary: HARQ Aided Systematic LT Coding for
Amplify-Forward and Decode-Forward Cooperation
Hoang Anh Ngo, Thanh Dang Nguyen and Lajos Hanzo
School of Electronics & Computer Science, University of Southampton
Email: {han08r, tnd03r, lh}@ecs.soton.ac.uk
Abstract--Systematic Luby Transform (SLT) codes constitute rateless
codes, which are capable of adaptively adjusting their code rate depend-
ing on the channel quality without explicit channel state information (CSI)
at the transmitters. SLTs are also suitable for space-time collaboration
aided relay networks. In this paper, an iterative decoding aided SLT
scheme is combined with 16-QAM transmission in a wireless relay aided
network. The Bit Error Ratio (BER) results and Extrinsic Information
Transfer (EXIT) charts are provided to evaluate the performance of the
proposed scheme. The simulation results show that the proposed scheme
using amplify-and-forward (AF) relaying achieves a 2.5dB gain at a BER
of 10-5, while the attainable improvement is nearly 6dB for decode-and-
forward (DF) relaying, compared to the non-cooperative scheme, where
the 16-QAM and the SLT decoder work independently. Moreover, the AF
relaying aided SLT coded 16-QAM scheme is more beneficial, when the
relay station is close to the source. By contrast, the DF relaying performs


Source: Anderson, Jim - School of Mathematics, University of Southampton


Collections: Mathematics