Low Overhead CQI Feedback in Multi-Carrier Systems

Author

Wu, Xiaoxin ; Zhou, Juejia ; Li, Guangjie ; Wu, May

Author_Institution

Intel China Res. Center Ltd, Beijing

fYear

2007

fDate

26-30 Nov. 2007

Firstpage

371

Lastpage

375

Abstract

Channel quality indication (CQI) feedback is crucial for OFDMA systems that explore multi-channel diversity. As CQI has to be updated frequently, when the number of active users gets large, the CQI feedback load may overwhelm the diversity gain. In this paper a threshold cutting-off CQI feedback scheme is investigated. An iterative learning control method is proposed to reach operating CQI thresholds in real systems. A multi-channel contention-based CQI message delivery scheme is designed and analyzed. Extensive simulation has been conducted to test the proposed scheme. It is observed that while the CQI feedback load is low, the system throughput is maintained at a satisfactory level.

Keywords

OFDM modulation; adaptive control; diversity reception; feedback; iterative methods; learning systems; telecommunication control; wireless channels; OFDMA systems; channel quality indication; contention-based message delivery scheme; iterative learning control method; low overhead CQI feedback; multicarrier systems; multichannel diversity; Automation; Communication standards; Control systems; Diversity methods; Feedback; Frequency diversity; Iterative methods; Testing; Throughput; Wireless communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 2007. GLOBECOM '07. IEEE

Conference_Location

Washington, DC

Print_ISBN

978-1-4244-1042-2

Electronic_ISBN

978-1-4244-1043-9

Type

conf

DOI

10.1109/GLOCOM.2007.76

Filename

4410986