An adaptive modulation scheme for low Earth orbit satellites

Author

Butchart, K. ; Braun, R.M.

fYear

1998

fDate

7-8 Sep 1998

Firstpage

43

Lastpage

46

Abstract

LEO satellites present widely varying signal conditions. Fixed modulation schemes are designed for the worst operating conditions and cannot take advantage of the better signal to noise conditions present at high elevations. An adaptive modulation scheme, which uses different constellation patterns with trellis coded modulation and a Reed Solomon outer code is proposed in this paper. The system is tested under AWGN noise and Rician/Rayleigh fading conditions. The system is found to provide good performance in AWGN and moderate fading conditions

Keywords

AWGN channels; Rayleigh channels; Reed-Solomon codes; Rician channels; adaptive modulation; satellite communication; trellis coded modulation; AWGN conditions; AWGN noise; LEO satellites; Reed Solomon outer code; Rician/Rayleigh fading conditions; adaptive modulation scheme; constellation patterns; low Earth orbit satellites; moderate fading conditions; signal to noise conditions; trellis coded modulation; AWGN; Additive white noise; Gaussian noise; Low earth orbit satellites; Modulation coding; Rayleigh channels; Reed-Solomon codes; Rician channels; Signal design; System testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications and Signal Processing, 1998. COMSIG '98. Proceedings of the 1998 South African Symposium on

Conference_Location

Rondebosch

Print_ISBN

0-7803-5054-5

Type

conf

DOI

10.1109/COMSIG.1998.736919

Filename

736919