Turbo-Estimation for CPM Over Frequency-Selective Fast Fading Channels

The benefits of continuous phase modulation (CPM), namely high power and spectral efficiencies, are often overshadowed by the high complexity that comes along with the nonlinearity of the modulation format. We tackle the problem of detection of a quaternary CPM signal in a frequency-selective fast f...

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Bibliographic Details
Published in:IEEE transactions on communications 2020-04, Vol.68 (4), p.2538-2550
Main Authors: El Chamaa, Makram, Lankl, Berthold
Format: Article
Language:English
Subjects:
Bit error rate
Channels
Computer simulation
Continuous phase modulation
Decoding
Detectors
Equalization
Fading
Fading channels
Frequency modulation
frequency-selective fading channels
optimal symbol-by-symbol detectors
Phase modulation
quaternary modulation schemes
Receivers
Selectivity
turbo channel estimation
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Summary:The benefits of continuous phase modulation (CPM), namely high power and spectral efficiencies, are often overshadowed by the high complexity that comes along with the nonlinearity of the modulation format. We tackle the problem of detection of a quaternary CPM signal in a frequency-selective fast fading channel. In particular, we derive a joint detector-equalizer using the Laurent principal pulse approximation. To handle time-selectivity, we adopt the well-known turbo-estimation approach. However, it turns out that classical turbo-estimation cannot be directly applied, but has to be modified beforehand. With the help of Monte Carlo bit error rate (BER) simulations, we show that using the modified turbo-estimation approach, the receiver is able to track channel variations within a transmit burst under fast fading conditions. This allows for a larger payload-to-overhead ratio. Since joint detection-equalization is practically feasible only for channels with short memory, we also consider a suboptimal approach which decouples detection from equalization.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2019.2906231