Performance improvement of M-ary orthogonal modulators

Author

Kim, Hae Geun ; Kang, Seok Youl

Author_Institution

Electron. & Telecommun. Res. Inst., Taejon, South Korea

Volume

2

fYear

1996

fDate

29 Sep-2 Oct 1996

Firstpage

642

Abstract

We have improved the performance of communication systems by employing the vectors derived from the optimization technique of signal waveforms (OSW) which maximizes the minimum distance between signal points in an n-dimensional Euclidean sphere. The resulting vectors are used in generating the output amplitude of impulse generator in an M-ary orthogonal modulator where the system error rates are minimized. In this paper, we derive the vectors for 16, 64, and 256 points on the surface of a 4-dimensional sphere. After mapping the signal into M-ary modulator, we have obtained considerable improvement in SNR over 2-D modulation schemes, 1.4 dB over 2×QPSK system, 3.0 dB over 2×8-PSK system, and 4.9 dB over 2×16-PSK system

Keywords

digital communication; error statistics; optimisation; phase shift keying; vectors; 4-dimensional sphere; M-ary orthogonal modulators; SNR; communication systems; impulse generator; n-dimensional Euclidean sphere; optimization technique; output amplitude; performance improvement; signal waveforms; system error rates; vectors; Amplitude modulation; Digital communication; Error analysis; Error probability; Euclidean distance; Frequency; Multidimensional systems; Phase shift keying; Quadrature phase shift keying; Signal mapping;

fLanguage

English

Publisher

ieee

Conference_Titel

Universal Personal Communications, 1996. Record., 1996 5th IEEE International Conference on

Conference_Location

Cambridge, MA

Print_ISBN

0-7803-3300-4

Type

conf

DOI

10.1109/ICUPC.1996.562652

Filename

562652