Capacity-approaching turbo coding and iterative decoding for relay channels

In this paper, we design turbo-based coding schemes for relay systems together with iterative decoding algorithms. In the proposed schemes, the source node sends coded information bits to both the relay and the destination nodes, while the relay simultaneously forwards its estimate for the previous...

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Bibliographic Details
Published in:IEEE transactions on communications 2005-11, Vol.53 (11), p.1895-1905
Main Authors: Zheng Zhang, Duman, T.M.
Format: Article
Language:English
Subjects:
Algorithm design and analysis
Algorithms
Applied sciences
Channel capacity
Codes
Coding, codes
cooperative diversity
Degradation
Detection, estimation, filtering, equalization, prediction
Digital relays
Exact sciences and technology
full duplex
Information rates
Information, signal and communications theory
Iterative algorithms
Iterative decoding
MIMO
multihop
multiple-input multiple-output (MIMO)
relay
Signal and communications theory
Signal, noise
Switching and signalling
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
Turbo codes
turbo coding
Upper bound
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Summary:In this paper, we design turbo-based coding schemes for relay systems together with iterative decoding algorithms. In the proposed schemes, the source node sends coded information bits to both the relay and the destination nodes, while the relay simultaneously forwards its estimate for the previous coded block to the destination after decoding and re-encoding. The destination observes a superposition of the codewords and uses an iterative decoding algorithm to estimate the transmitted messages. Different from the block-by-block decoding techniques used in the literature, this decoding scheme operates over all the transmitted blocks jointly. Various encoding and decoding approaches are proposed for both single-input single-output and multi-input multi-output systems over several different channel models. Capacity bounds and information-rate bounds with binary inputs are also provided, and it is shown that the performance of the proposed practical scheme is typically about 1.0-1.5 dB away from the theoretical limits, and a remarkable advantage can be achieved over the direct and multihop transmission alternatives.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2005.858654