Title :
Decision feedback equalization and carrier recovery in 140 Mbit QAM digital radio systems
Author :
Olmos, J.J. ; Agusti, R. ; Casadevall, F.
Author_Institution :
E.T.S.I. Telecommun., Barcelona, Spain
Abstract :
The tracking behavior of a decision-feedback equalizer coupled to a carrier recovery loop in the presence of dynamic multipath-fading activity is studied. Minimum-phase/non-minimum-phase-type fading transitions, with notch-depth variation-rates up to 120 dB/s, and fadings sweeping across the signal band at 300 MHz/s, are considered. Free interaction between the two adaptive devices is allowed. Simulated tap gains are compared to those theoretically obtained to justify the observed RMS error increase, which can eventually lead to the system outage. The extra degree of freedom arising in the recovered carrier phase does not seem to disturb the behavior of the coupled system.<>
Keywords :
amplitude modulation; digital radio systems; equalisers; fading; 140 Mbit/s; QAM; RMS error; adaptive devices; carrier recovery; decision-feedback equalizer; digital radio systems; dynamic multipath-fading activity; minimum phase type fading transitions; nonminimum phase type fading transitions; notch-depth variation-rates; recovered carrier phase; tap gains; tracking behavior; Decision feedback equalizers; Delay; Demodulation; Digital communication; Fading; Feedback loop; Microwave propagation; Quadrature amplitude modulation; Telecommunications; Tracking loops;
Conference_Titel :
Communications, 1988. ICC '88. Digital Technology - Spanning the Universe. Conference Record., IEEE International Conference on
Conference_Location :
Philadelphia, PA, USA
DOI :
10.1109/ICC.1988.13768
