Topic
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.
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09 Mar 2014
TL;DR: In this paper, the performance of multi-dimensional permutation modulation formats was analyzed and it was shown that their spectral efficiencies can approach the Shannon limit even when their power efficiencies are kept high.
Abstract: We analyze the performance of multi-dimensional permutation modulation formats. With the increase in the dimension of modulation, their spectral efficiencies can approach the Shannon limit even when their power efficiencies are kept high.
11 citations
01 Apr 1996
TL;DR: It is shown that the dual-mode phase-continuous chirp signals out perform monomode signals by nearly 0.8 dB, when corresponding high-SNR 5-bit optimum minimum-bit-error-probability receivers are employed.
Abstract: In a spread-spectrum system the transmitted signal is spread over
a wide frequency band, often much wider than the minimum bandwidth
needed for the information to be conveyed. The concept of varying the
modulation index of a continuous phase FSK (i.e. CPFSK) waveform is
applied to digital transmission using chirp signals. These multimode
chirp waveforms are described and their ability to perform over the
coherent Gaussian channel is examined. It is shown that the dual-mode
phase-continuous chirp signals out perform monomode signals by nearly
0.8 dB, when corresponding high-SNR 5-bit optimum
minimum-bit-error-probability receivers are employed. A low-complexity
suboptimum average matched filter receiver for multimode chirp signals
is examined and explicit expressions for its performance are given
11 citations
TL;DR: In this paper, a simple and quick method to measure the transmittance of large optical elements with irregular surface profiles by retrieving it from only two diffraction patterns recorded by a CCD camera is presented.
Abstract: Accurate measurements of the transmittance of large optical elements are essential to improve the energy density in inertial confinement fusion (ICF). The required complex transmittance of such optical elements used in ICF is obtained by computing the phase difference between the illuminating and transmitting fields using modulation coherent imaging (MCI). A phase plate designed as a modulator has a known transmission function in this technique. It presents a simple and quick method to measure the transmittance of large optical elements with irregular surface profiles by retrieving it from only two diffraction patterns recorded by a CCD camera. The complex transmittance of a continuous phase plate (CPP) with a large aperture used in ICF is measured experimentally, and the results are found to agree with the designed value.
11 citations
01 Jan 1997
TL;DR: In this article, the authors developed optimum and sub-optimum receivers for jointly detecting two cochannel continuous phase modulated (CPM) signals based upon Laurent's representation of binary CPM as the sum of a finite number of pulse amplitude modulated signals.
Abstract: In this paper, we develop optimum and suboptimum receivers for jointly detecting two cochannel continuous phase modulated (CPM) signals. These receivers are based upon Laurent’s representation of binary CPM as the sum of a finite number of pulse amplitude modulated signals. We also provide a review of the Laurent representation and its application to the design of optimum and suboptimum single-channel receivers.
11 citations
18 Mar 2015
TL;DR: Simple and robust features to distinguish continuous-phase frequency shift keying from quadrature amplitude and phase shift modulations are proposed and performance is compared to the wavelet based feature that uses support vector machines for classification.
Abstract: In this paper we propose simple and robust features to distinguish continuous-phase frequency shift keying from quadrature amplitude and phase shift keying modulations. Robustness is tested in the presence of SNR estimation offset, block and correlated fast fading, lack of symbol and sampling synchronization, and carrier offset. The features are based on sample mean and sample variance of the imaginary part of the product of two consecutive complex signal values. Root raised cosine pulses are used to generate the linearly modulated signals. Root raised cosine as well as rectangular shaped instantaneous frequency pulses are used in designing the continuous-phase frequency shift keying signals. Support vector machines are employed to distinguish the signals. One benefit of using support vector machines is that it requires very few realizations for training. Moreover, no a priori information is required about carrier amplitude, carrier phase, carrier offset, symbol rate, pulse shape and initial symbol phase. Performance of the proposed feature is compared to the wavelet based feature that uses support vector machines for classification.
11 citations