DocumentCode :
36650
Title :
Rateless Codes for the Multiway Relay Channel
Author :
Hussain, Iqbal ; Ming Xiao ; Rasmussen, Lars K.
Author_Institution :
Commun. Theor. Lab., R. Inst. of Technol. (KTH), Stockholm, Sweden
Volume :
3
Issue :
5
fYear :
2014
fDate :
Oct. 2014
Firstpage :
457
Lastpage :
460
Abstract :
We consider distributed Luby transform (DLT) codes for efficient packet transmission in a multiway relay network, where the links are modeled as erasure channels. Density evolution is applied for asymptotic performance analysis and subsequently used in a linear-programming design framework for optimizing the degree distribution at the relay in terms of overhead. Moreover, a buffer is introduced at the relay to enable efficient downlink transmission even if packets are lost during uplink transmission. Performance losses in terms of delay and/or erasure rates caused by link erasures during uplink transmission are thus alleviated. The proposed DLT codes provide significant improvements in overhead and decoded erasure rates. Numerical results for finite-length codes follow closely the asymptotic analysis. Our results demonstrate that the proposed buffer-based DLT codes outperform its counterparts for lossy uplink transmission.
Keywords :
linear programming; radio links; relay networks (telecommunication); wireless channels; DLT codes; asymptotic analysis; degree distribution; density evolution; distributed Luby transform; downlink transmission; erasure channels; finite length codes; linear programming design framework; multiway relay channel; multiway relay network; packet transmission; rateless codes; uplink transmission; Decoding; Delays; Downlink; Encoding; Propagation losses; Relays; Uplink; LT codes; degree distribution; erasure rate; multi-way relay channels;
fLanguage :
English
Journal_Title :
Wireless Communications Letters, IEEE
Publisher :
ieee
ISSN :
2162-2337
Type :
jour
DOI :
10.1109/LWC.2014.2328636
Filename :
6825843
Link To Document :
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