Efficient Resource Allocation for OFDMA-Based Two-Hop Relay Systems

Author

Jeon, Wha Sook ; Jeong, Sang Soo ; Jeong, Dong Geun

Author_Institution

Sch. of Electr. Eng. & Comput. Sci., Seoul Nat. Univ., Seoul, South Korea

Volume

60

Issue

5

fYear

2011

fDate

6/1/2011 12:00:00 AM

Firstpage

2378

Lastpage

2383

Abstract

We propose an efficient resource allocation scheme for the downlink of orthogonal frequency-division multiple-access (OFDMA)-based two-hop relay systems. The proposed scheme reuses the subchannels within a single cell in the frequency-selective fading environment by allocating a subchannel to multiple links simultaneously. We first formulate a preliminary subchannel allocation problem in consideration of the quality-of-service (QoS) requirements for both real-time traffic and nonreal-time traffic. We also design an efficient postprocessing algorithm that modifies the solution obtained by solving the preliminary problem so that it can be used in practical OFDMA systems. Numerical results show that the proposed scheme can significantly improve system performance.

Keywords

OFDM modulation; fading channels; frequency division multiple access; frequency selective surfaces; quality of service; resource allocation; telecommunication network routing; telecommunication traffic; OFDMA; QoS; frequency-selective fading environment; multiple links; nonreal-time traffic; orthogonal frequency-division multiple-access; quality-of-service; resource allocation; subchannel allocation problem; two-hop relay systems; Interference; OFDM; Quality of service; Receivers; Relays; Resource management; Throughput; Orthogonal frequency-division multiple access (OFDMA); subchannel allocation; two-hop relay system;

fLanguage

English

Journal_Title

Vehicular Technology, IEEE Transactions on

Publisher

ieee

ISSN

0018-9545

Type

jour

DOI

10.1109/TVT.2011.2146286

Filename

5754614