Rateless Codes for the Multiway Relay Channel
2014 (English)In: IEEE Wireless Communications Letters, ISSN 2162-2337, E-ISSN 2162-2345, Vol. 3, no 5, 457-460 p.Article in journal, Letter (Refereed) Published
We consider distributed Luby transform (DLT) codes for efficient packet transmission in a multi-way 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.
Place, publisher, year, edition, pages
2014. Vol. 3, no 5, 457-460 p.
degree distribution, erasure rate., LT codes, multi-way relay channels
IdentifiersURN: urn:nbn:se:kth:diva-158128DOI: 10.1109/LWC.2014.2328636ScopusID: 2-s2.0-84908058137OAI: oai:DiVA.org:kth-158128DiVA: diva2:774598
QC 201504162014-12-262014-12-262015-04-16Bibliographically approved