Geographic Cooperative Routing for Minimum Symbol Error Rate in Wireless Multihop Networks

Yu TIAN  Linhua MA  Bo SONG  Hong TANG  Song ZHANG  Xing HU  

IEICE TRANSACTIONS on Communications   Vol.E97-B   No.2   pp.441-449
Publication Date: 2014/02/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E97.B.441
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Network
ad hoc networks,  cooperative communication,  geographic routing,  symbol error rate,  

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Much work in cooperative communication has been done from the perspective of the physical and network layers. However, the exact impact of signal error rate performance on cooperative routing discovery still remains unclear in multihop ad hoc networks. In this paper, we show the symbol error rate (SER) performance improvement obtained from cooperative commutation, and examine how to incorporate the factor of SER into the distributed routing discovery scheme called DGCR (Dynamic Geographic Cooperative Routing). For a single cooperative communication hop, we present two types of metric to specify the degree that one node is suitable for becoming the relay node. One metric is the potential of a node to relay with optimal SER performance. The other metric is the distance of a node to the straight line that passes through the last forwarding node and the destination. Based on location knowledge and contention scheme, we combine the two metrics into a composite metric to choose the relay node. The forwarding node is chosen dynamically according to the positions of the actual relay node and the destination. Simulation results show that our approach outperforms non-cooperative geographic routing significantly in terms of symbol error rate, and that DGCR's SER performance is better than traditional geographic cooperative routing with slight path length increase.