Adaptive data rate using ARQ and nonuniform constellations

Author

Otnes, Roald ; Maseng, Torleiv

Author_Institution

UniK-Center for Technol., Kjeller, Norway

Volume

2

fYear

2001

fDate

2001

Firstpage

1211

Abstract

We introduce an automatic repeat request (ARQ) scheme that uses nonuniform signal constellations in order to adapt the data rate to the received signal-to-noise ratio (SNR) in a fading channel without using channel state feedback or incremental redundancy. We have defined nonuniform phase shift key (PSK) and quadrature amplitude modulation (QAM) constellations with an arbitrary number of classes of bits. These constellations may also be of interest for further research into unequal error protection. We present simulations of the throughput in Rayleigh fading and lognormal shadowing, and discuss the cases where our proposed scheme may improve the throughput compared to standard ARQ using uniform signal constellations

Keywords

AWGN; Rayleigh channels; automatic repeat request; error statistics; feedback; phase shift keying; quadrature amplitude modulation; ARQ; AWGN; BER perforinance; PSK constellations; QAM constellations; SNR; adaptive data rate; additive white Gaussian noise; automatic repeat request; channel state feedback; error probability; fading channel; incremental redundancy; lognormal shadowing; nonuniform PSK; nonuniform QAM; nonuniform signal constellations; phase shift keying; quadrature amplitude modulation; received signal-to-noise ratio; throughput; Automatic repeat request; Constellation diagram; Error correction codes; Fading; Phase shift keying; Quadrature amplitude modulation; Redundancy; Signal to noise ratio; State feedback; Throughput;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd

Conference_Location

Rhodes

ISSN

1090-3038

Print_ISBN

0-7803-6728-6

Type

conf

DOI

10.1109/VETECS.2001.944576

Filename

944576