A New Power Allocation Method for Parallel AWGN Channels in the Finite Block Length Regime

Author

Park, Jung-Hyun ; Park, Dong-Jo

Author_Institution

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

Volume

16

Issue

9

fYear

2012

fDate

9/1/2012 12:00:00 AM

Firstpage

1392

Lastpage

1395

Abstract

We investigate power allocation methods over AWGN channels in order to maximize the lower bound of the achievable rate, which is a more practical measure than channel capacity in the finite block length regime. Since the objective function of the optimization problem to solve is not concave, a part of the objective function is relaxed into a Taylor series expansion. Using the modified objective function, we propose a modified water-filling scheme to maximize the lower bound of the achievable rate with given power constraints, and verify the convergence of the proposed method. Numerical results show that the proposed scheme outperforms the conventional water-filling method in the finite block length regime.

Keywords

AWGN channels; finite element analysis; optimisation; series (mathematics); Taylor series expansion; finite block length regime; modified water-filling scheme; objective function; optimization problem; parallel AWGN channels; power allocation method; AWGN; AWGN channels; Channel capacity; Optimization; Resource management; Signal to noise ratio; Vectors; Power allocation; achievable rate; channel capacity; finite block length;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2012.071612.120447

Filename

6244778