Simple Dynamic Subcarrier Allocation With CQI Feedback Reduction for OFDMA Systems

The focus of this paper is a proposal for a computationally efficient dynamic subcarrier allocation (DSA) algorithm for orthogonal frequency-division multiple access (OFDMA) systems. The proposed DSA algorithm considerably reduces the computational complexity and the amount of channel quality information (CQI) compared to amplitude-craving greedy (ACG) algorithms, which use full CQI. At the same time, the performance of the proposed algorithm closely approaches that achieved by ACG algorithms. Moreover, the authors present a new bandwidth-assignment algorithm produced by modifying bandwidth assignment based on the signal-to-noise ratio (BABS). This modified BABS algorithm enables the proposed DSA algorithm to produce a strong outage performance gain over the conventional scheme.

[1]  Kung Yao,et al.  Channel Estimation and Optimal Power Allocation for a Multiple-Antenna OFDM System , 2002, EURASIP J. Adv. Signal Process..

[2]  A. Czylwik,et al.  Adaptive OFDM for wideband radio channels , 1996, Proceedings of GLOBECOM'96. 1996 IEEE Global Telecommunications Conference.

[3]  Michael Mecking.  Resource allocation for fading multiple-access channels with partial channel state information , 2002, 2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333).

[4]  Didem Kivanc-Tureli,et al.  Computationally efficient bandwidth allocation and power control for OFDMA , 2003, IEEE Trans. Wirel. Commun..

[5]  Daesik Hong,et al.  Adaptive multicarrier system with reduced feedback information in wideband radio channels , 1999, Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324).

[6]  Jeffrey G. Andrews,et al.  Optimal power allocation in multiuser OFDM systems , 2003, GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489).

[7]  Youngsoo Kim,et al.  A joint feedback reduction scheme using delta modulation for dynamic channel allocation in OFDMA systems , 2007, IEEE Transactions on Wireless Communications.

[8]  Khaled Ben Letaief,et al.  Multiuser OFDM with adaptive subcarrier, bit, and power allocation , 1999, IEEE J. Sel. Areas Commun..

[9]  Víctor P. Gil Jiménez,et al.  Subcarrier and Power Allocation for the Downlink of Multiuser OFDM Transmission , 2006, Wirel. Pers. Commun..

[10]  John M. Cioffi,et al.  Increase in capacity of multiuser OFDM system using dynamic subchannel allocation , 2000, VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026).

[11]  V. Roman,et al.  Broadband wireless access solutions based on OFDM access in IEEE 802.16 , 2002 .