Adaptive bit and power allocation algorithm in V-BLAST system

Author

Feng, Xingle ; Zhu, Shihua ; Wu, Linjun

Author_Institution

Sch. of Electron. & Inf. Eng., Xi´´an Jiaotong Univ., China

Volume

1

fYear

2004

fDate

5-8 Sept. 2004

Firstpage

489

Abstract

In the existing V-BLAST system with adaptive modulation, spectral efficiency decreases dramatically at lower SNR due to the invalid subchannnel which does not meet the target BER. To resolve this problem, a power reallocation algorithm is proposed in this paper. The post-detection SNR of the valid subchannel can be improved by reallocating the power quotas of the invalid channel to valid ones. Simulation results show that by means of the proposed method the spectral efficiency increases obviously, especially when the SNR is low.

Keywords

MIMO systems; adaptive modulation; bandwidth allocation; mobile radio; Bell Labs Layered Space-Time system; MIMO channels; V-BLAST system; adaptive bit allocation; adaptive modulation; mobile communications; multiple input multiple output systems; post-detection SNR; power allocation; power reallocation algorithm; spectral efficiency; Adaptive systems; Bit error rate; Bit rate; Detection algorithms; MIMO; Maximum likelihood decoding; Maximum likelihood detection; Mobile communication; Power engineering and energy; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Personal, Indoor and Mobile Radio Communications, 2004. PIMRC 2004. 15th IEEE International Symposium on

Print_ISBN

0-7803-8523-3

Type

conf

DOI

10.1109/PIMRC.2004.1370919

Filename

1370919