Open AccessMitigating interference and reducing detection complexity in asynchronous cooperative relay network utilising new distributed space time block coding
Author(s) -
Elazreg Abdulghani M.,
Kharaz Ahmad H.
Publication year - 2020
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/cmu2.12045
Subject(s) - relay , computer science , decoding methods , cooperative diversity , linear network coding , asynchronous communication , full rate , diversity gain , node (physics) , space–time block code , block code , single antenna interference cancellation , coding (social sciences) , computational complexity theory , block (permutation group theory) , algorithm , real time computing , computer network , fading , mathematics , power (physics) , statistics , physics , structural engineering , quantum mechanics , network packet , engineering , geometry
The synchronisation in wireless cooperative relay networks is impossible to achieve in real environment utilising orthogonal space time block coding. There have been several approaches proposed to mitigate the effect of synchronisation among the relay nodes at the receiver. All have managed to reduce the inter‐symbol interference at the expense of low data rate with high detection complexity. Others achieved full data rate and high cooperative diversity using high decoding complexity that requires a feedback link. In this paper, a new approach is presented that reduces inter‐symbol interference, achieves full data rate and full cooperative diversity with low complexity. This uses a new efficient distributed orthogonal space time block coding design with a sub‐optimum detection scheme utilising dual relay nodes. This reduces the number of timing misalignments among the relay nodes and minimises the detection complexity. Furthermore, the new proposed method uses linear decoding process to achieve full data rate and full cooperative diversity without the need for any a feedback link. The analytical analysis and simulation results confirmed that sub‐optimum approach with the new efficient design are very effective at reducing the lack of synchronisation among the relay nodes at the destination node with low encoding and decoding complexities.