DocumentCode :
2128011
Title :
Adaptive resource allocation in OFDMA with insufficient guard interval under fractional load
Author :
Cui, Jie ; Chang, Yong-yu ; Liu, Shu-hui ; Yang, Da-cheng
Author_Institution :
Wireless Theor. & Technol. Lab. (WT&T), Univ. of Posts & Telecommun., Beijing, China
fYear :
2009
fDate :
13-16 Sept. 2009
Firstpage :
3174
Lastpage :
3178
Abstract :
Orthogonal frequency division multiple access (OFDMA), which is known as one of the most promising physical techniques for advanced wireless communications system, generally has a guard interval (GI) to mitigate the inter-symbol interference (ISI) and inter-carrier interference (ICI) caused by delay paths. However, the intra-cell interference (ISI and ICI) may be severe, when GI becomes insufficient in an execrable radio environment. Under fractional load (FL), resource allocator doesn´t have to occupy entire system bandwidth due to the lack of traffic in the network, that is, the flexibility of allocator is increased for resource management. Instead of the complicated interference reduction algorithms at the receiver, in this paper we proposed a novel adaptive resource allocation (ARA) scheme, which utilizes the flexibility of radio resource management under FL, to efficiently avoid intra-cell interference in insufficient GI scenario. System-level simulations show that, the proposed ARA improves system performance than the conventional resource allocation (CRA) under FL, whereas the performance of proposed ARA approaches the CRA under the full load.
Keywords :
OFDM modulation; frequency division multiple access; intersymbol interference; resource allocation; OFDMA; adaptive resource allocation; advanced wireless communications; delay paths; fractional load; guard interval; intercarrier interference mitigation; intersymbol interference mitigation; intracell interference; orthogonal frequency division multiple access; radio resource management; Bandwidth; Delay; Digital signal processing; Finite impulse response filter; Interference elimination; Intersymbol interference; Physical layer; Receivers; Resource management; Signal processing algorithms; Insufficient GI; OFDMA; Resource allocation;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2009 IEEE 20th International Symposium on
Conference_Location :
Tokyo
Print_ISBN :
978-1-4244-5122-7
Electronic_ISBN :
978-1-4244-5123-4
Type :
conf
DOI :
10.1109/PIMRC.2009.5449886
Filename :
5449886
Link To Document :
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