Title :
Rate unity trellis codes with quadrature-quadrature phase shift keying (Q2PSK) signals
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., George Washington Univ., Washington, DC, USA
Abstract :
Trellis coding with a spectrally efficient 4D signal set due to newly developed Q2PSK (quadrature-quadrature phase-shift keying) is addressed. Some simple hand designed trellis codes at rate unity are presented. A sixteen state code provides a coding gain of 6.02 dB. With the same number of states in Ungerboeck´s 8-PSK, trellis (1982), the gain is 4.1 dB. In low intersymbol interference situations, the bandwidth efficiency of this coded Q2PSK is twice that of coded 8-PSK; if both operate at 2 bits/s/Hz and an error event probability of 10-5, the coded Q2PSK provides a savings of about 4 dB over the coded 8-PSK
Keywords :
error correction codes; phase shift keying; Q2PSK; bandwidth efficiency; bit rate; coding gain; error correction codes; error event probability; low intersymbol interference; quadrature-quadrature phase shift keying; rate unity; sixteen state code; spectrally efficient 4D signal; trellis codes; AWGN; Additive noise; Bandwidth; Convolutional codes; Euclidean distance; Gain; Intersymbol interference; Modulation coding; Phase shift keying; Signal design;
Conference_Titel :
TENCON '89. Fourth IEEE Region 10 International Conference
Conference_Location :
Bombay
DOI :
10.1109/TENCON.1989.177032
