Feedback outage correlated with CQI and its impact on multiuser diversity in Rayleigh fading channels

Author

Shin, Eun-Hee ; Kim, Dongwoo

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., Hanyang Univ., Ansan

Volume

10

Issue

12

fYear

2006

fDate

12/1/2006 12:00:00 AM

Firstpage

831

Lastpage

833

Abstract

This letter addresses a feedback outage when the channel condition of the feedback channel is correlated with that of the traffic channel the quality information of which is being carried by the feedback, and its impact on the multiuser diversity in flat Rayleigh fading channels. The correlation is described by the time delay as well as the frequency separation between the traffic and the feedback channel. The average capacity is provided in terms of the time and the frequency factor. With numerical investigations, we show that the capacity degradation due to the feedback outage is generally saturated at the great frequency separation approximately over 45 MHz (e.g., in present IS-95 cellular systems), within which it fluctuates depending on the feedback delay

Keywords

Rayleigh channels; channel capacity; correlation methods; delays; diversity reception; feedback; multiuser channels; CQI; Rayleigh fading channel; channel capacity; channel quality information; correlation; feedback outage; frequency separation; multiuser diversity; time delay; traffic channel; Channel capacity; Degradation; Delay effects; Downlink; Fading; Feedback; Frequency diversity; Rayleigh channels; Traffic control; Wireless networks;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2006.061005

Filename

4027618