Title :
A new carrier recovery circuit for mobile satellite communications
Author :
Matsumoto, Y. ; Morikura, Masahiro ; Kato, S.
Author_Institution :
NTT Radio Commun. Syst. Lab., Kanagawa, Japan
Abstract :
A reverse modulation carrier recovery circuit for coherent detection of QPSK signals in Rician fading channels is proposed. The scheme consists of two reverse modulation type carrier recovery circuits, one of which has a wideband filter and the other a narrowband filter. The forward error correction (FEC) decoded data is used to reverse-modulate the received signals for the carrier recovery circuit, with a wideband filter, to achieve a low carrier skipping rate and a good phase tracking performance. It is clarified by computer simulation that the Pe (bit error probability) performance of QPSK coherent detection using the proposed carrier recovery circuit show an Es/N0 improvement of 4.0 Db without interleaving, and 1.2 dB with interleaving (size 64×64) at Pe=10-4 (C/M=10 dB; fDT=1.67×10-2) compared with conventional coherent detection employing the reverse modulation tank-limiter scheme
Keywords :
demodulators; fading; filters; mobile radio systems; phase shift keying; satellite relay systems; FEC; QPSK signals; Rician fading channels; bit error probability; coherent detection; computer simulation; decoded data; forward error correction; interleaving; low carrier skipping rate; mobile satellite communications; narrowband filter; phase tracking performance; received signals; reverse modulation carrier recovery circuit; wideband filter; Circuits; Filters; Forward error correction; Interleaved codes; Narrowband; Quadrature phase shift keying; Rician channels; Satellite communication; Signal detection; Wideband;
Conference_Titel :
Vehicular Technology Conference, 1992, IEEE 42nd
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-0673-2
DOI :
10.1109/VETEC.1992.245289
