NDLI: Application of post-distortion angular equalizer on continuous phase modulated (CPM) waveform

Content Provider	IEEE Xplore Digital Library
Author	Norris, J.A. Hessel, C.
Copyright Year	2000
Description	Author affiliation: RF Commun. Div., Harris Corp., Rochester, NY, USA (Norris, J.A.)
Abstract	CPM waveforms which are utilized in both MIL-STD-188-181B (181B) and high performance waveform SATCOM operation undergo appreciable distortion due to the effects of the bandlimiting and hard-limiting satellite transponder. In this application, the traditional LMS equalizer can remove some of the intersymbol interference, but at the higher symbol rates, the modem performance is still far off from the same bit error rate achieved in an environment which only contains additive white Gaussian noise. Observation of the SATCOM channel has shown that the CPM waveform is predictable, distorted in phase during symbol transitions. Large phase transitions incur a larger, proportional amount of distortion when compared to smaller phase transitions. A characterization of the phase error as a function of all the possible clockwise and counterclockwise adjacent phase transitions for the CPM phase constellation illuminates this proportion property of the distortion caused by the intersymbol interference. Once this error is characterized for all the symbols, it can be removed via complex multiplication. This method has been shown to outperform the traditional LMS equalizer in this application especially when considering the noise enhancement inherent in the LMS equalizer implementation. This paper documents the simulation comparison of the LMS equalizer and the new non-linear equalizer approach along with actual radio bit error rate curves.
Starting Page	1159
Ending Page	1163
File Size	495998
Page Count	5
File Format	PDF
ISBN	0780365216
DOI	10.1109/MILCOM.2000.904109
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-10-22
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Equalizers Nonlinear distortion Least squares approximation Phase distortion Intersymbol interference Bit error rate Satellite broadcasting Transponders Modems Additive white noise
Content Type	Text
Resource Type	Article

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