Title :
Bit synchronization and timing sensitivity in adaptive Viterbi equalizers for narrowband-TDMA digital mobile radio systems
Author :
Baier, A. ; Heinrich, G. ; Wellens, U.
Author_Institution :
Philips Kommunikations Ind. AG, Nuremberg, West Germany
Abstract :
An adaptive Viterbi-MLSE equalizer for narrowband-TDMA (time-division multiple-access) digital mobile radio systems is presented which uses a straightforward channel sounding technique for fast periodic equalizer start-up. The equalizer is specifically tailored for the application with h=0.5 partial-response CPM (continuous-phase modulation) schemes such as GMSK or GTFM. Exploiting the features of the channel-sounding Viterbi equalizer, a simple sample timing and bit synchronization technique is developed which uses a free-running sampling clock. The timing sensitivity of a digital mobile radio receiver based on the presented equalization and synchronization concepts is studied by computer simulations
Keywords :
digital communication systems; digital simulation; equalisers; mobile radio systems; multi-access systems; phase modulation; radio receivers; synchronisation; time division multiplexing; GMSK; GTFM; MLSE equalisers; adaptive Viterbi equalizers; bit synchronization; channel sounding technique; computer simulations; digital mobile radio receiver; digital mobile radio systems; equalization; free-running sampling clock; narrowband-TDMA; partial-response CPM; time-division multiple-access; timing sensitivity; Adaptive equalizers; Clocks; Delay; Maximum likelihood estimation; Sampling methods; Synchronization; Time division multiplexing; Time measurement; Timing; Viterbi algorithm;
Conference_Titel :
Vehicular Technology Conference, 1988, IEEE 38th
Conference_Location :
Philadelphia, PA
DOI :
10.1109/VETEC.1988.195388
