Title :
Performance improvement of M-ary orthogonal modulators
Author :
Kim, Hae Geun ; Kang, Seok Youl
Author_Institution :
Electron. & Telecommun. Res. Inst., Taejon, South Korea
fDate :
29 Sep-2 Oct 1996
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;
Conference_Titel :
Universal Personal Communications, 1996. Record., 1996 5th IEEE International Conference on
Conference_Location :
Cambridge, MA
Print_ISBN :
0-7803-3300-4
DOI :
10.1109/ICUPC.1996.562652
