Binary Continuous Phase Modulations Robust to a Modulation Index Mismatch

We consider binary continuous phase modulation (CPM) signals used in some recent low-cost and low-power consumption telecommunications standard. When these signals are generated through a low-cost transmitter, the real modulation index can end up being quite different from the nominal value employed...

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Bibliographic Details
Published in:IEEE transactions on communications 2015-11, Vol.63 (11), p.4267-4275
Main Authors: Messai, Malek, Colavolpe, Giulio, Amis, Karine, Guilloud, Frederic
Format: Article
Language:English
Subjects:
Approximation methods
Bandwidth
Binary systems (materials)
Channels
Continuous phase modulation
Density
Detectors
Encoders
Engineering Sciences
Format
Modulation
modulation index mismatch
Phase modulation
precoding
Receivers
Robustness
Signal and Image processing
Spectra
Transmitters
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Summary:We consider binary continuous phase modulation (CPM) signals used in some recent low-cost and low-power consumption telecommunications standard. When these signals are generated through a low-cost transmitter, the real modulation index can end up being quite different from the nominal value employed at the receiver and a significant performance degradation is observed unless proper techniques for the estimation and compensation are employed. For this reason, we design new binary schemes with a much higher robustness. They are based on the concatenation of a suitable precoder with binary input and a ternary CPM format. The result is a family of CPM formats whose phase state is constrained to follow a specific evolution. Two of these precoders are considered. We will discuss many aspects related to these schemes, such as the power spectral density, the spectral efficiency, simplified detection, the minimum distance, and the uncoded performance. The adopted precoders do not change the recursive nature of CPM schemes. So these schemes are still suited for serial concatenation, through a pseudo-random interleaver, with an outer channel encoder.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2015.2478819