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Effect of Power Allocation Schemes on MIMO TwoWay MultiHop Network
Jonghyun LEE Gia Khanh TRAN Kei SAKAGUCHI Kiyomichi ARAKI
Publication
IEICE TRANSACTIONS on Communications
Vol.E93B
No.12
pp.33623370 Publication Date: 2010/12/01 Online ISSN: 17451345
DOI: 10.1587/transcom.E93.B.3362 Print ISSN: 09168516 Type of Manuscript: Special Section PAPER (Special Section on Wireless Distributed Networks) Category: Keyword: MIMO twoway multihop network, power allocation, eigenvector based power allocation (EPA), optimal power allocation (OPA), distributed power allocation (DPA),
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Summary:
Recently, wireless multihop network using MIMO twoway relaying technique has been attracted much attention owing to its high network efficiency. It is well known that the MIMO twoway multihop network (MTMN) can provide its maximum throughput in uniform topology of node location. However, in realistic environments with nonuniform topology, network capacity degrades severely due to unequal link quality. Furthermore, the endtoend capacity also degrades at high SNR due to far (overreach) interference existing in multihop relay scenarios. In this paper, we focus on several power allocation schemes to improve the endtoend capacity performance of MTMN with nonuniform topology and far interference. Three conventional power allocation schemes are reformulated and applied under the system model of MTMN. The first two are centralized methods, i.e., Eigenvector based Power Allocation (EPA) which employs linear algebra and Optimal Power Allocation (OPA) using convex optimization. The last one is Distributed Power Allocation (DPA) using game theory. It is found from numerical analyses that the power allocation schemes are effective for MTMN in terms of endtoend capacity improvement, especially in nonuniform node arrangement and at high SNR.


