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.
Papers published on a yearly basis
Papers
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01 Jan 2017TL;DR: This paper presents the transmission of broadband complex modulated signals with data rates up to 64Gbit/s using an analog front-end based on monolithic microwave integrated circuits (MMICs) at a carrier frequency of 300GHz.
Abstract: This paper presents the transmission of broadband complex modulated signals with data rates up to 64Gbit/s using an analog front-end based on monolithic microwave integrated circuits (MMICs) at a carrier frequency of 300GHz. Besides the typical modulation formats like BPSK, QPSK, and 16QAM a non-common modulation format 8APSK is introduced and measured. The maximal transmitter symbol rate is 32Gbd. The signal quality is evaluated in terms of error vector magnitude, which shows values of −10.8dB for BPSK and −10.10dB for QPSK at a symbol rate of 32Gbd and values of −14.8dB for 16QAM at a symbol rate of 2Gbd.
11 citations
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TL;DR: In this article, the authors proposed a transmissive metasurface with the ability to form a continuous phase profile by using high-index dielectric nanobeams with gradually modulated widths, which is a virtually impedance-matched material with spatial variations of its refractive index.
Abstract: Metasurfaces can manipulate optical wavefronts by locally shifting the phase of incident light with metallic or dielectric optical nanoresonators that are generally arranged on a lattice with subwavelength spacing. However, such conventional metasurfaces inevitably generate a spatially discrete multi-level phase profile due to the spacing of their building blocks. This directly leads to an efficiency reduction and thus limits their capability. Here, we propose and demonstrate highly efficient transmissive metasurfaces with the ability to form a continuous phase profile. The proposed strategy relies on the fact that high-index dielectric nanobeams with gradually modulated widths can be interpreted to be a virtually impedance-matched material with spatial variations of its refractive index. By highly utilizing such features, one-dimensionally continuous, arbitrary phase profiles can be created in a simple manner with the width profile design. Since spatial transmittance variations can be minimized due to the impedance matching feature, this approach provides a nearly ideal phase profile for spatial light modulation with phase-only filtering operations. We demonstrate that this approach has the capability to improve the performance in various metasurface-based optical components, including polarization-dependent, large-angle beam deflectors and versatile multi-beam splitters. Considering that designing optical phases even in deep-subwavelength regimes is critical for free-space optics, the proposed approach will enable new classes of optical components with complex wavefront engineering.
11 citations
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11 citations
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30 Nov 2009TL;DR: A technique for constructing a training sequence of known symbols instead of a CP for CPMFDE and results in a 60 GHz environment show that the proposed technique satisfies all requirements.
Abstract: Frequency domain equalization (FDE) of continuous phase modulations (CPM) has been thoroughly investigated lately. To enable this low-complexity FDE, all known techniques use a cyclic prefix (CP). However, using a training sequence (TS) of known symbols instead of a CP offers some advantages: the additional known symbols can be used to improve synchronization and channel estimation, with the same performance of a CP. Nevertheless, using a TS for CPM-FDE is not trivial because the memory in a CPM waveform has to be taken into account to guarantee cyclicity and phase continuity after insertion of the TS into a block of input symbols. In this paper, we therefore propose a technique for constructing a TS for CPMFDE. Simulation results in a 60 GHz environment show that the proposed technique satisfies all requirements. The 60 GHz case is chosen because CPM with FDE has recently been proposed for communications at 60 GHz and the latest IEEE and ECMA standards for these frequencies mandate the use of a TS rather than a CP.
11 citations
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TL;DR: A low-complexity detector (LCD) for binary CPM with small modulation index is proposed, which can generate appropriate metrics for the soft decision decoding, which is desirable in a coded CPM system.
Abstract: Binary continuous phase modulation (CPM) with modulation index $h = 0.5$ can be approximated by a linear modulation, which leads to a low-complexity serial receiver. By reconstructing CPM signals generated with a small modulation index into equivalent CPM signals with modulation index $h = 0.5$ , a low-complexity detector (LCD) for binary CPM with small modulation index is proposed. The complexity of the resulting detector is significantly reduced with respect to that of optimal coherent receivers with negligible performance loss. In addition, the detector can generate appropriate metrics for the soft decision decoding, which is desirable in a coded CPM system.
11 citations