An improved ARQ scheme with application to multi-level modulation techniques

Author

Gidlund, Mikael ; Xu, Youzhi

Author_Institution

Radio Commun. Systerms LAB, R. Inst. of Technol., Stockholm, Sweden

Volume

2

fYear

2004

fDate

26-29 Oct. 2004

Firstpage

973

Abstract

We present a simple, but effective, packet combined ARQ scheme for multi-level modulation schemes such as MPAM, MPSK and MQAM. We propose an ARQ scheme that rearranges the symbols between different transmissions and also uses the modulation level, M, as an extra dimension to improve the quality of the signal and reduce the number of retransmissions per packet. The idea is to see the modulation level and number of retransmissions as an augmented signal space and use packet combining to improve the robustness and performance. Our results show that the proposed ARQ scheme obtains a 4 dB gain compared to a packet combined ARQ scheme employing Chase combining.

Keywords

automatic repeat request; packet radio networks; phase shift keying; pulse amplitude modulation; quadrature amplitude modulation; Chase combining; PAM; PSK; QAM; augmented signal space; multi-level modulation techniques; packet combined ARQ scheme; packet combining; retransmissions; wireless multimedia communication; Additive white noise; Automatic repeat request; Constellation diagram; Diversity reception; Gaussian noise; Multiaccess communication; Radio communication; Robustness; Signal design; Working environment noise;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications and Information Technology, 2004. ISCIT 2004. IEEE International Symposium on

Print_ISBN

0-7803-8593-4

Type

conf

DOI

10.1109/ISCIT.2004.1413864

Filename

1413864