Title :
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
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;
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
DOI :
10.1109/GLOCOM.2007.76
