Limiter-discriminator detection of Continuous Phase Modulation (CPM) Tomlinson filtering
Abstract
Limiter-discriminator detection of Continuous Phase Modulation (CPM) partial response signals is of special importance in system in which phase coherence is very difficult to establish and/or maintain (e.g., mobile communications systems). We propose a Tomlinson-based approach which copes with the intersymbol interference (ISI) introduced by the baseband partial response frequency modulating pulses of the CPM schemes, (e.g., GTFM, GMSK, Raised Cosin (RC)). In this approach, the ISI equalization is divided between the transmitter and the receiver. We investigate, through simulation, the detectability performance and spectral properties of a number of CPM signals and receiver structures with special emphasis on the Tomlinson approach. It is shown that this novel application of the Tomlinson configuration allows the use of relatively simple receivers which exhibit almost the same performance as more complex Viterbi structured receivers.
- Publication:
-
IEEE Transactions on Communications
- Pub Date:
- February 1994
- Bibcode:
- 1994ITCom..42..819T
- Keywords:
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- Continuous Spectra;
- Frequency Discriminators;
- Intersymbolic Interference;
- Limiter Circuits;
- Phase Coherence;
- Phase Modulation;
- Signal Detection;
- Spatial Filtering;
- Computerized Simulation;
- Mobile Communication Systems;
- Performance Prediction;
- Receivers;
- Spectral Signatures;
- Transmitters;
- Electronics and Electrical Engineering