Chunk-Based Resource Allocation in OFDMA Systems - Part II: Joint Chunk, Power and Bit Allocation

Zhu, Huiling and Wang, Jiangzhou (2012) Chunk-Based Resource Allocation in OFDMA Systems - Part II: Joint Chunk, Power and Bit Allocation. IEEE Transactions on Communications, 60 (2). pp. 499-509. ISSN 0090-6778. (The full text of this publication is not available from this repository)

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Official URL
http://dx.doi.org/10.1109/TCOMM.2011.112811.110036

Abstract

By grouping a number of adjacent subcarriers into a chunk, resource allocation can be carried out chunk by chunk in orthogonal frequency division multiple access (OFDMA) systems. Chunk-based resource allocation is an effective approach to reduce the complexity of resource allocation in OFDMA systems. In this paper, a chunk-based resource allocation scheme, i.e. joint chunk, power and bit allocation, is proposed and analyzed by maximizing the throughput under a total transmit power constraint. A scaling factor is introduced to achieve optimal allocation. Considering the digital nature of bits per symbol per subcarrier (bits/symbol/subcarrier), a digitization process is proposed to digitize the theoretically allocated bits/symbol/subcarrier to integer. System parameters, such as the power constraint, number of users, coherence bandwidth, number of subcarriers and number of chunks, are introduced and their impacts on the average throughput are studied. The performance of the dynamic power allocation scheme is compared with the fixed power allocation scheme. The numerical results show that the theoretical throughput of the fixed power allocation scheme is quite close to that of the dynamic power allocation scheme. However, when the digital nature of bits/symbol/subcarrier is considered, the average throughput of the dynamic power allocation outperforms the fixed power allocation scheme.

Item Type: Article
Uncontrolled keywords: Resource allocation, orthogonal frequency division multiple Access (OFDMA), dynamic power allocation, digital nature of bits, multiuser diversity
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101 Telecommunications > TK5103.4 Broadband (inc wireless broadband)
Divisions: Faculties > Science Technology and Medical Studies > School of Engineering and Digital Arts > Broadband & Wireless Communications
Depositing User: J. Harries
Date Deposited: 17 Aug 2012 12:46
Last Modified: 30 Apr 2014 15:49
Resource URI: http://kar.kent.ac.uk/id/eprint/30181 (The current URI for this page, for reference purposes)
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