Title :
Reduced Complexity Subcarrier Allocation Schemes for DFT-Precoded OFDMA Uplink Systems
Author :
Pao, Wei-Cheng ; Chen, Yung-Fang
Author_Institution :
Dept. of Commun. Eng., Nat. Central Univ., Jungli, Taiwan
fDate :
9/1/2010 12:00:00 AM
Abstract :
A resource allocation problem of maximizing total achievable rates for multi-user DFT-precoded orthogonal frequency division multiplexing (OFDM) uplink systems is investigated in this paper. A suboptimal subcarrier allocation scheme is proposed, which uses a proposed spectral efficiency enhancement parameter as an index to assign subcarriers to users. The proposed scheme has a lower computational complexity than that of the existing scheme which is shown to be close to the multiuser waterfilling solution. The simulation results show the proposed suboptimal scheme outperforms the existing scheme. Besides, an iterative subcarrier allocation scheme is proposed to improve the performance.
Keywords :
OFDM modulation; discrete Fourier transforms; frequency division multiple access; iterative methods; precoding; resource allocation; DFT-precoded OFDMA uplink systems; computational complexity; iterative subcarrier allocation scheme; multiuser waterfllling solution; orthogonal frequency division multiplexing; reduced complexity subcarrier allocation schemes; resource allocation problem; spectral efficiency enhancement parameter; Computational complexity; Computational modeling; Frequency conversion; Frequency division multiplexing; OFDM; Peak to average power ratio; Polynomials; Radio spectrum management; Resource management; Search methods; Orthogonal frequency division multiplexing (OFDM); orthogonal frequency division multiple access (OFDMA); resource allocation; subcarrier allocation;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2010.070910.090709
