Title :
A digital coherent receiver suitable for land-mobile satellite communications
Author :
Yoshida, Shousei
Author_Institution :
C&C Syst. Res. Labs., NEC Corp., Kawasaki, Japan
fDate :
11/1/1995 12:00:00 AM
Abstract :
Describes an advanced coherent demodulation technique suitable for land-mobile satellite communications. The proposed technique features a combined narrow/wide band dual open loop (DOL) carrier phase estimator, which effectively enables the coherent receiver to track fast phase fluctuations caused by fading, without degradation in phase slip characteristics. Additionally, an open loop phase estimator has inherent quick recovery performance. Its bit error rate (BER) performance is shown to be superior to that for existing detection schemes, achieving a 10-2 BER at 6.3 dB Eb/N0 (0.9 dB greater than the theoretical Eb/N0 condition for perfect carrier phase tracking) for QPSK over a Rician fading channel with the 10 dB Rician factor and the 1/16 baud rate fading pitch. The paper also describes a quick bit timing recovery scheme, with interpolation, featuring an open loop structure. Further, it presents an experimental digital modem developed through the use of digital signal processors
Keywords :
Rician channels; digital radio; error statistics; fading; interpolation; land mobile radio; mobile satellite communication; modems; phase estimation; quadrature phase shift keying; radio receivers; synchronisation; tracking; QPSK; Rician fading channel; advanced coherent demodulation technique; bit error rate performance; combined narrow/wide band dual open loop carrier phase estimator; digital coherent receiver; digital modem; digital signal processors; fading; fast phase fluctuations; interpolation; land-mobile satellite communications; open loop phase estimator; open loop structure; phase slip characteristics; quick bit timing recovery scheme; quick recovery performance; Bit error rate; Degradation; Demodulation; Fading; Fluctuations; Phase estimation; Rician channels; Satellite communication; Tracking loops; Wideband;
Journal_Title :
Vehicular Technology, IEEE Transactions on