DocumentCode :
2893058
Title :
Multi-Hop Capacity of MIMO-Multiplexing Relaying in WiMAX Mesh Networks
Author :
Sulyman, Ahmed Iyanda ; Takahara, Glen ; Hassanein, Hossam S. ; Kousa, Maan
Author_Institution :
Telecommun. Res. Lab., Queens Univ. Kingston, Kingston, ON, Canada
fYear :
2009
fDate :
14-18 June 2009
Firstpage :
1
Lastpage :
5
Abstract :
One of the main challenges for metro-scale WiMAX mesh network deployments is related to capacity scaling. In a full mesh mode, a WiMAX node acts as a mesh router as well as a client access node. To improve latency and speed performance, typical dual- and multi-radio mesh solutions use different radio channels to create separate links for access and mesh relaying services. The available spectrum is therefore split between mesh and client access services. Network operators operating the WiMAX system over the licensed spectrum are not keen to provide separate radio channels for access and mesh relay services, as this reduces the total number of users serviced per spectrum allocation. MIMO-multiplexing relaying approach however provides separate links for access and mesh relaying services on the same radio channel. In this paper, we discuss the multi-hop capacity of OFDM-based MIMO-multiplexing relaying in WiMAX networks. For an NxN MIMO-multiplexing relaying with amplification factor alpha at relay nodes, R-hops relaying degrade the capacity by at most -Nlog2(alpha2R/(1 +SigmaR r-1 alpha2rNr)) + RN/log2(N) bits/sec/Hz. Therefore, greater capacity loss is experienced in networks employing high-order MIMO- multiplexing relaying. We also show that the capacity loss is independent of the OFDM configurations employed; thus network operators could employ higher OFDM configurations to compensate data rate loss in access services when some of the MIMO-multiplexing links are dedicated to mesh relay. This analysis provides useful guidelines for operators planning MIMO-multiplexing option for mesh support in WiMAX network.
Keywords :
MIMO communication; WiMax; channel capacity; multiplexing; relays; telecommunication services; wireless channels; MIMO; OFDM; WiMAX; access relay service; capacity loss; channels; mesh networks; mesh relay service; mesh router; multihop capacity; multiplexing; Base stations; MIMO; Mesh networks; OFDM; Peer to peer computing; Physical layer; Relays; Space technology; Spread spectrum communication; WiMAX;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communications, 2009. ICC '09. IEEE International Conference on
Conference_Location :
Dresden
ISSN :
1938-1883
Print_ISBN :
978-1-4244-3435-0
Electronic_ISBN :
1938-1883
Type :
conf
DOI :
10.1109/ICC.2009.5199201
Filename :
5199201
Link To Document :
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