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Continuous phase modulation

About: Continuous phase modulation is a research topic. Over the lifetime, 3199 publications have been published within this topic receiving 37245 citations. The topic is also known as: CPM.


Papers
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Proceedings ArticleDOI
28 Oct 2001
TL;DR: The concatenation of a turbo encoder and a CPM modulator which can be decoded and demodulated iteratively and multiple iterations of this turbo-decoder/CPM demodulator operation enhances the performance of the system.
Abstract: Continuous phase modulation (CPM) provides an attractive option for spectrally efficient communications systems. Turbo-coding combined with CPM has the potential to result in a spectrally efficient scheme that is also energy efficient in that it yields low error rates at low signal-to-noise ratios. In this paper we consider the concatenation of a turbo encoder and a CPM modulator which can be decoded and demodulated iteratively. For demodulation of the CPM signal we consider a design based on the Walsh signal space. Multiple iterations of the turbo decoder, feedback of a priori CPM symbol probabilities from the turbo-decoder to the CPM demodulator and multiple iterations of this turbo-decoder/CPM demodulator operation enhances the performance of the system.

36 citations

Patent
20 Dec 1996
TL;DR: In this paper, the optical phase and polarization of an optical signal with a periodic waveform having harmonic content that is more complex than that associated with a simple sinusoidal waveform were modulated.
Abstract: A method and apparatus is provided that yields improved performance by modulating the optical phase and polarization of an optical signal with a periodic waveform having harmonic content that is more complex than that associated with a simple sinusoidal waveform. A phase modulator receives an optical signal onto which data has been modulated at a predetermined frequency. The phase modulator modulates the phase of the optical signal in a continuous manner with the periodic waveform with complex harmonics where the fundamental phase modulation frequency is equal to the same predetermined frequency at which the data is modulated onto the optical signal. In another illustrative embodiment of the invention, a polarization modulator further processes the optical signal by modulating the state-of-polarization of the signal in a continuous fashion with the periodic waveform with complex harmonics where the fundamental polarization modulation frequency is equal to the same predetermined frequency at which the data is modulated onto the optical signal. In addition to being continuously modulated, the polarization modulation is performed so that the average value of the state of polarization over each modulation cycle is substantially equal to zero.

36 citations

Journal ArticleDOI
Xiaojing Huang1, Yunxin Li1
TL;DR: The solution for decomposing continuous-phase modulated (CPM) signals with integer modulation index into pulse-amplitude modulated components is presented and the notion of main complex pulse is introduced.
Abstract: This article presents the solution for decomposing continuous-phase modulated (CPM) signals with integer modulation index into pulse-amplitude modulated components. The notion of main complex pulse is also introduced. A simplified demodulator for CPM signals with integer modulation index is proposed as an application example and simulation results using a quaternary 2 raised cosine (RC) scheme are given.

35 citations

Journal ArticleDOI
TL;DR: A range of space-invariant and space-variant holographic optical interconnections are demonstrated with the aid of a nematic liquid-crystal panel that is capable of nearly continuous phase modulation.
Abstract: A range of space-invariant and space-variant holographic optical interconnections are demonstrated with the aid of a nematic liquid-crystal panel that is capable of nearly continuous phase modulation. Results on fan-out, nearest-neighbor/next-nearest-neighbor interconnects, and 8-bit perfect shuffle are presented. The diffraction efficiencies are close to 15% of incident light in all cases.

35 citations

Proceedings ArticleDOI
23 May 2011
TL;DR: An optimization strategy known as Marginal Fisher's Information (MFI), recently shown to be an efficient and effective strategy for the selection of high-dimensional codes, is here applied within the CPM framework to design continuous waveforms that are physically realizable.
Abstract: The optimization of radar codes for specific use within the continuous phase modulation (CPM) implementation is presented as a means to achieve both power and spectral efficiency for radar emissions. An optimization strategy known as Marginal Fisher's Information (MFI), recently shown to be an efficient and effective strategy for the selection of high-dimensional codes, is here applied within the CPM framework to design continuous waveforms that are physically realizable.

35 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202316
202241
202136
202060
201976
201870