DocumentCode :
2211820
Title :
Single antenna interference alignment for finite relay networks
Author :
Zhou, Haichuan ; Wilcox, Dave ; Ratnarajah, Tharm ; Sellathurai, Mathini
Author_Institution :
ECIT, Queen´´s Univ. Belfast, Belfast, UK
fYear :
2012
fDate :
11-13 April 2012
Firstpage :
231
Lastpage :
235
Abstract :
We consider a K-user interference channel where sources communicate with destinations via only one layer of relays (i.e. no direct links) and show that the interference alignment for all user pairs can be achieved using a finite number of relays. Here we assume a quasi-static channel and all nodes are equipped with a single antenna. We employ two strategies: coding at the edge and coding in the middle, in which relays play different roles. In the coding at the edge strategy, relays generate equivalent channels and we use leakage minimization and asymptotic design schemes to construct precoding matrices for all users. We unveil a novel feature of relays: generating channel randomness. In the coding in the middle strategy, relays construct time-extended gain matrices, so we propose a novel and more effective relay coding design based on a rank minimization algorithm. Both strategies successfully implement interference alignment and approach high degrees of freedom per user.
Keywords :
antennas; interference (signal); K-user interference channel; antenna interference alignment; asymptotic design scheme; edge strategy; equivalent channel; finite relay networks; leakage minimization; precoding matrices; quasi-static channel; rank minimization algorithm; relay coding design; time-extended gain matrices; Antennas; Encoding; Interference channels; MIMO; Minimization; Relays;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Systems, Signals and Image Processing (IWSSIP), 2012 19th International Conference on
Conference_Location :
Vienna
ISSN :
2157-8672
Print_ISBN :
978-1-4577-2191-5
Type :
conf
Filename :
6208115
Link To Document :
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