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检索条件"主题词=Pulse Position Modulation"

共 769 条记录，以下是81-90 订阅

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UWB multiple access performance using Time Hopped pulse position modulation with Biorthogonal signaling

UWB multiple access performance using Time Hopped Pulse Posi...

引用

IEEE Conference on Ultra-Wideband Systems and Technologies

作者： Clabaugh, DJ Temple, MA Raines, RA Canadeo, CM USAF Inst Technol Dept Elect & Comp Engn Wright Patterson AFB OH 45433 USA

ISBN: (纸本)0780381874

This paper extends previous UWB multiple access (MA) performance characterization by combining pseudorandomly coded, Time Hopped pulse position modulation (TH-PPM) with 4-Ary Biorthogonal communication signaling, referred to here as TH-BPPM MA signaling. Communication performance for the hybrid TH-BPPM technique is first validated for a single user operating over an AWGN channel. Single user results are then extended and MA performance characterized for both synchronous and asynchronous networks containing up to 15 users. In both cases, the proposed 4-Ary TH-BPPM technique with Gold coding achieves nearly identical performance as previously demonstrated MA methods employing binary TH-PPM. A key benefit afforded by the 4-Ary TH-BPPM technique, given fixed average power and symbol length constraints, is a doubling of the effective data rate while achieving identical bit error rate performance.

关键词： pulse position modulation

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Impact of Pointing Errors and Fading in a Pre-Amplified pulse position modulation Optical Receiver 12

Impact of Pointing Errors and Fading in a Pre-Amplified Puls...

引用

12th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP)

作者： Yiannopoulos, Konstantinos Sagias, Nikos C. Boucouvalas, Anthony C. Univ Peloponnese Dept Informat & Telecommun Tripoli Greece

ISBN: (数字)9781728167435

ISBN: (纸本)9781728167435

We present analytical results on the average bit error probability (ABEP) of an optically pre-amplified pulse-position-modulation (PPM) receiver that operates under fading and pointing errors. The analytical description enables the efficient calculation of the ABEP in Malaga-M, gamma - gamma and negative-exponential fading for a wide range of modulation orders and noise modes. As expected, a significant power budget gain is initially obtained by increasing the PPM modulation order, however a further improvement requires the optimization of the received beam waist. Finally, the noise modes that enter the receiver negatively affect its operation irrespective of fading and pointing errors.

关键词： optical amplifier pulse position modulation Malaga M fading pointing errors

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Performance analysis of non-orthogonal pulse position modulation for time-hopping UWB transmission

Performance analysis of non-orthogonal pulse position modula...

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5th Annual Conference on Communication Networks and Services Research

作者： Zhang, Hao Li, Wei Gulliver, T. Aaron Department of Electrical Engineering Ocean University of China Dept. of Electrical and Computer Engineering University of Victoria

ISBN: (纸本)9780769528359

In this paper, we study the performance of nonorthogonal pulse position modulation (NPPM) for ultra-wideband (UWB) communication. Error probability and performance bounds are derived for a multi-user environment. It is shown that with proper selection of the pulse waveform and modulation index, NPPM can achieve better performance than orthogonal PPM with the same throughput.

关键词： pulse position modulation

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Design of a Virtual Quadrant Receiver for 4-ary pulse position modulation/Optical Code Division Multiple Access (4-ary PPM/O-CDMA)

Design of a Virtual Quadrant Receiver for 4-ary Pulse Positi...

引用

Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference

作者： Hernandez, V. J. Mendez, A. J. Gagliardi, R. M. Bennett, C. V. Univ Calif Davis Davis CA 95616 USA Mendez R&D Associate El Segundo CA USA Lawrence Livermore Natl Lab Livermore CA USA Univ Southern Calif Los Angeles CA USA

We propose a virtual quadrant receiver for 4-ary PPM/O-CDMA. Numerical simulations determine the impact of multi-access interference and optical beat interference oil correct symbol detection versus the number of conc... 详细信息

ISBN: (纸本)9781424435906

关键词： pulse position modulation

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Design of Optical pulse position modulation (PPM) Translating Receiver

Design of Optical Pulse Position Modulation (PPM) Translatin...

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22nd Annual Meeting of the IEEE-Photonics-Society

作者： Mendez, Antonio J. Hernandez, Vincent J. Gagliardi, Robert M. Bennett, Corey V. Mendez R&D Associates El Segundo CA 90245 USA Lawrence Livermore Natl Lab Livermore CA 94550 USA Univ Southern Calif Los Angeles CA USA

We have described a design for a receiver that directly converts PPM pulse positions into bit sequences for arbitrary M and data rate. The design is enabled by lossless splitters based on EDWA/PLCs. © 2009 IEEE.

ISBN: (纸本)9781424436804

关键词： pulse position modulation

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Novel Multi-code pulse position modulation for Performance Improvement of 2-D OCDMA Systems

Novel Multi-code Pulse Position Modulation for Performance I...

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17th Asia-Pacific Conference on Communications (APCC)

作者： Dang, Ngoc T. Pham, Hien T. T. Pham, Anh T. Posts & Telecommun Inst Technol Fac Telecommun Hanoi Vietnam Univ Aizu Comp Commun Lab Aizu Wakamatsu Fukushima Japan

ISBN: (纸本)9781457703881;9781457703898

In OCDMA systems, pulse position modulation (PPM) and multi-code modulation (MCM) have been proven as efficient methods for respectively mitigating multiple access interference (MAI) and dispersion. In this paper, we propose to combine PPM and MCM to create a novel modulation scheme, multi-code pulse position modulation (MCPPM). We then theoretically analyze the performance of the 2-D OCDMA system using MCPPM over a linear dispersive channel, while taking into account the negative impact of MAI, optical-beating interference (OBI), and receiver noise. It is seen that the use of MCPPM can simultaneously relax the effects of MAI, OBI, and dispersion. As a result, in comparison to the conventional systems using PPM and MCM, the one using MCPPM can support a higher user bit rate and a larger number of users. Also, a lower transmitted power can be achieved.

关键词： 2D OCDMA systems Bit error rate Fiber gratings modulation Optical pulses Optical receivers code division multiple access dispersive channels interference (signal) linear dispersive channel multicode modulation multicode pulse position modulation multiple access interference optical communication optical-beating interference pulse position modulation receiver noise

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Virtual Array Receiver Options for 64-ary pulse position modulation (PPM)

Virtual Array Receiver Options for 64-ary Pulse Position Mod...

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Conference on Free-Space Laser Communication Technologies XXI

作者： Mendez, Antonio J. Hernandez, Vincent J. Gagliardi, Robert M. Bennett, Corey V. Mendez R&D Associates POB 2756 El Segundo CA 90245 USA Lawrence Livermore Natl Lab Livermore CA 94551 USA Univ Southern Calif Dept Elect Engn Los Angeles CA 90089 USA

ISBN: (纸本)9780819474452

NASA is developing technology for 64-ary PPM using relatively large PPM time slots (10 ns) and relatively simple electronic-based receiver logic. In this paper we describe photonics-based receiver options for the case of much higher data rates and inherently shorter decision times. The receivers take the form of virtual (array or quadrant) arrays with associated comparison tests. Previously we explored this concept for 4-ary and 16-ary PPM at data rates of up to 10 Gb/s. The lessons learned are applied to the case of 64-ary PPM at 1.25 Gb/s. Various receiver designs are compared, and the optimum design, based on virtual arrays, is evaluated using numerical simulations.

关键词： pulse position modulation optical communications arrayed receivers

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Demonstration of 50 ps Per-position Differential pulse position modulation Data Transmission 10

Demonstration of 50 ps Per-Position Differential Pulse Posit...

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IEEE 10th Jubilee Workshop on Advances in Information, Electronic and Electrical Engineering (AIEEE)

作者： Selis, Oskars Migla, Sandis Sics, Pauls Eriks Zeltins, Maris Spolitis, Sandis Aboltins, Arturs Riga Tech Univ Inst Microwave Engn & Elect Riga Latvia Riga Tech Univ Inst Telecommun Riga Latvia

ISBN: (纸本)9798350311785

To prolong the lifespan of devices with a limited power budget, efficient modulation schemes, such as pulse position modulation (PPM), can be employed. High-order differential pulse position modulation (DPPM), which can be efficiently demodulated using an event timer, presents advantages over other PPM modulation methods because it can provide higher data rates and does not require synchronization. This research aims to demonstrate data transmission using high-order DPPM signal in a laboratory environment and measure bit error ratio (BER) for position widths 50-200 ps. In the theoretical part, an assessment of data transmission rate dependence from the position count and position width of DPPM signal with guard time is presented. Moreover, a theoretical comparison in terms of power efficiency and maximum data rate with other types of PPM, such as transmitted reference pulse-position modulation (TR-PPM), is made. In the experimental part, the performance measurements of DPPM communication system consisting of arbitrary waveform generator (AWG) as DPPM transmitter and Eventech A033-ET/USB event timer as digital-to-time converter (DTC) of DPPM receiver are presented.

关键词： pulse position modulation ultra-wideband timing energy efficiency communication

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Quantum pulse position modulation with Photon-Added Squeezed States

Quantum Pulse Position Modulation with Photon-Added Squeezed...

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IEEE Global Communications Conference (GLOBECOM) on Advanced Technology for 5G Plus

作者： Guerrini, Stefano Chiani, Marco Win, Moe Z. Conti, Andrea Univ Ferrara CNIT DE Ferrara Italy Univ Bologna CNIT DEI Bologna Italy MIT LIDS 77 Massachusetts Ave Cambridge MA 02139 USA

ISBN: (纸本)9781728173078

This paper introduces the use of photon-added squeezed states (PASSs) for quantum pulse position modulation (QPPM). It is shown that the use of PASSs in QPPM communication systems can reduce the symbol error probability (SEP) with respect to the use of different classes of quantum states with the same energy, including squeezed states and photon-added coherent states. The impact of thermal noise and phase diffusion on the SEP is also evaluated. The findings of this paper show the utility of PASSs in quantum communication systems.

关键词： Quantum communications photon-added squeezed state pulse position modulation quantum noise quantum state discrimination

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An Optical pulse position modulation Based On Double-Circle Iteration 15

An Optical Pulse Position Modulation Based On Double-Circle ...

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15th International Conference on Optical Communications and Networks (ICOCN)

作者： Xia, Wei Liu, Bo Zhang, Lijia Xin, Xiangjun Zhang, Qi Tian, Qinghua Tian, Feng Wang, Yongjun Rao, Lan Luo, Biao Liu, Yingjun Tang, Bao BUPT Sch Elect Engn State Key Lab Informat Photon & Opt Commun Xitucheng Rd 10 Beijing 100876 Peoples R China

ISBN: (纸本)9781509034918

In this paper, we have proposed an optical pulse position modulation based on double-circle iteration, targeting at the next generation of high speed optical metropolitan area networks. The focuse of this paper lies on the performance of spectral efficiency, the bit error rate and chromatic dispersion. The proposed modulation format is also compared to on-off-keying(OOK) and 4-level pulse-amplitude modulation(PAM4). The results show a clear advantage of bit error rate and dispersion tolerance, thus it can achieve longer fiber delivery distance.

关键词： optical metropolitan area networks double-circle iteration pulse position modulation bit error rate chromatic dispersion

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