Multi-level Power Loading Using Limited Feedback

Author

Lee, Jung Hoon ; Choi, Wan

Author_Institution

Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol. (KAIST), Daejeon, South Korea

Volume

16

Issue

12

fYear

2012

fDate

12/1/2012 12:00:00 AM

Firstpage

2024

Lastpage

2027

Abstract

In this letter, we propose multi-level power loading (MPL) as a discrete version of mercury/waterfilling power allocation. In MPL, one among several discrete power levels is allocated to each subchannel. Firstly, we find an MPL solution with perfect channel state information at the transmitter. Lloyd´s algorithm is used for the joint optimization of grouping and power levels. Then, we propose stepwise mercury/waterfilling for practical implementation of the MPL under limited feedback. With a fixed feedback budget, we also show that the optimal power level size should be determined according to delay spread of given channel and operating SNR of a target system.

Keywords

channel allocation; delays; feedback; optimisation; radio transmitters; Lloyd algorithm; channel state information; delay spread; discrete power levels; fixed feedback budget; joint optimization; limited feedback; multilevel power loading; power allocation; stepwise mercury-waterfilling; subchannel allocation; Channel models; Loading; OFDM; Optimization; Resource management; Signal to noise ratio; Transmitters; Limited feedback; multi-level power loading; parallel channels; stepwise mercury/waterfilling;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2012.102612.122017

Filename

6343254