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Combined pulse shape and pulse position modulation for high data rate transmissions in ultra-wideband communications

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International Journal of Wireless Information Networks 2003年第4期10卷 167-178页

作者： Mitchell, Craig John De Abreu, Giuseppe Thadeu Freitas Kohno, Ryuji Graduate School of Engineering Division of Physics Yokohama National University 79-5 Hodogaya Yokohama 240-850 Japan

In this paper we present a novel method for high data rate transmissions in ultra-wideband (UWB) communications systems. This is achieved through the combination of conventional pulse position modulation and pulse shape modulation schemes. The result is a pulse shape and position modulation that allows transmission of more bits of information in the same amount of time and using the same number of pulses as the conventional schemes. A feature of the proposed system is that the allowable alphabet is limited so as to ensure equal power in transmission of all symbols. Symbol size can also be easily changed without significantly changing the hardware of the system. Theoretical error performance analysis of this system is also provided.

关键词： pulse position modulation

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Reconstruction method for pulse position modulation-ultra wideband communication signal based on compressed sensing

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IET COMMUNICATIONS 2014年第5期8卷 707-713页

作者： Wang Weidong Yang Jun-an Yin Haibo Wang Shehui Inst Elect Engn Hefei Peoples R China Key Lab Elect Restrict Anhui Prov Hefei Peoples R China

pulse position modulation-ultra wideband (PPM-UWB) communication adopts ultra narrow pulse as the transmitted signal. Owing to the low-power spectral density and ultra wide bandwidth, it is difficult to detect and sample PPM-UWB signal directly. There are already some researches on using compressed sensing (CS) theory for UWB communication with lower sampling speed. However, these methods take the sparseness of pulse position or transmission channel into account separately and they are unfit for practical communication. To solve these problems, a dual-sparse reconstruction method is proposed in this paper to process PPM-UWB communication signal based on CS theory. Proposed method designs the target signal which needed to be reconstructed as a dual-sparse vector. This vector combines the sparseness of PPM pulse position and UWB channel multi-paths simultaneously, hence it has dual sparseness. The information code can be demodulated from reconstructed dual-sparse vector directly by using energy detection method. Extensive numerical simulations demonstrate the validity and applicability of proposed method.

关键词： pulse position modulation ultra wideband communication compressed sensing pulse position modulation ultra wideband communication signal ultra narrow pulse transmitted signal low power spectral density ultra wide bandwidth compressed sensing theory transmission channel practical communication dual sparse reconstruction method PPM UWB communication signal PPM pulse position UWB channel reconstructed dual sparse vector energy detection method numerical simulations

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Polarized OFDM-Based pulse position modulation for High-Speed Wireless Optical Underwater Communications

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IEEE TRANSACTIONS ON COMMUNICATIONS 2023年第12期71卷 7163-7173页

作者： Qi, Zhuoran Zhao, Xueyuan Pompili, Dario Rutgers State Univ Dept Elect & Comp Engn ECE New Brunswick NJ 08854 USA

An underwater wireless optical communication link can provide high-speed data transfer for robotics applications in deep waters. However, optical links are limited in terms of coverage range because of the high attenuation of light in water caused by absorption and scattering effects. In this work, a new optical transceiver architecture is proposed to solve this coverage problem via a novel Orthogonal Frequency Division Multiplexing (OFDM)-based Polarized pulse position modulation (in short, P-OFDM-PPM) with time-frequency spreading. The optical polarization diversity and multiplexing are utilized at the optical transmitter to improve the system's robustness and the transmission data rate. This new scheme is able to boost the range coverage by several folds as verified via simulations using realistic models of optical channel propagation. The proposed architecture can be integrated into existing underwater robots to enable next-generation range-extended and high-speed optical links for oceanic explorations.

关键词： pulse position modulation orthogonal frequency division multiplexing time-frequency spreading optical transceiver underwater vehicles and robotics polarization diversity

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A novel low complexity data demodulation algorithm for pulse position modulation

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DIGITAL SIGNAL PROCESSING 2012年第3期22卷 535-543页

作者： Merz, Roman Botteron, Cyril Farine, Pierre-Andre Witschi Elect Ltd CH-3294 Buren An Der Aare Switzerland EPFL Inst Microengn IMT Elect & Signal Proc Lab ESPLAB CH-2000 Neuchatel Switzerland

In this paper, a low complexity data demodulation algorithm is proposed that requires time of arrival information of the received signal exclusively. As an application example, the algorithm is applied to an ultra-wideband impulse radio communication system with pulse position modulation. The algorithm is insensitive to a common time delay for all pulses, that means, it does not require an accurate synchronization between the transmitter and the receiver. For the performance estimation, only a symbol synchronization is assumed, i.e., that there is a priori knowledge which pulse marks the beginning of a received data symbol. The performance of the proposed algorithm is evaluated for straightforward time of arrivals estimators, such as a maximum detector or a threshold detector. It is shown that the proposed algorithm outperforms a least squares algorithm in all considered scenarios. In particular, an increased robustness against additive white Gaussian noise, impulse like noise, and multiuser interference is demonstrated as well as an improved performance for multipath propagation channels. (C) 2012 Elsevier Inc. All rights reserved.

关键词： Ultra-wide bandwidth Impulse radio pulse position modulation Data demodulation algorithm Time of arrival Bit error rate

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Photonic generation of UWB pulses with pulse position modulation

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ELECTRONICS LETTERS 2010年第1期46卷 99-100页

作者： Mu, H. Yao, J. Univ Ottawa Sch Informat Technol & Engn Microwave Photon Res Lab Ottawa ON K1N 6N5 Canada Beijing Univ Aeronaut & Astronaut Inst Optoelect Engn Beijing 100083 Peoples R China

A novel photonic approach to generating ultra-wideband (UWB) signals with pulse position modulation (PPM) is proposed. The proposed system consists of two subsystems, the first subsystem being a two-tap photonic microwave delay-line filter for UWB monocycle pulse generation, the second subsystem being a pulse-position-modulation module to achieve PPM. When a Gaussian pulse train is inputted to the first subsystem, a monocycle pulse train is generated. The PPM is then realised in the second subsystem by modulating the state of polarisation of the monocycle pulse train with a data sequence, which is then sent to a polarisation-dependent device to introduce a time delay difference. An UWB signal with PPM at a bit rate of 625 Mbit/s is experimentally generated.

关键词： Gaussian distribution Gaussian pulse train UWB monocycle pulse generation bit rate 625 Mbit/s data sequence microwave photonics optical pulse generation photonic generation photonic microwave delay-line filter pulse position modulation pulse position modulation module ultra wideband communication ultra-wideband signals

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Performance of multiple pulse position modulation on multipath channels

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IEE PROCEEDINGS-OPTOELECTRONICS 1996年第6期143卷 360-364页

作者： Park, H Barry, JR School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta USA

The effect of multipath dispersion on multiple pulse position modulation (MPPM) and its variants PPM and overlapping PPM are examined. Upper bounds for the error probability of each modulation scheme in the presence of intersymbol interference are presented, considering both an unequalised receiver and the optimal maximum-likelihood sequence detection receiver. Numerical results show that all the PPM-based schemes are approximately equally sensitive to multipath dispersion, and significantly more sensitive to multipath dispersion than on-off keying when maximum-likelihood sequence detection is used.

关键词： optical communications pulse position modulation

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Spectral characterisation of shortened pulse position modulation format

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ELECTRONICS LETTERS 2010年第5期46卷 355-U4878页

作者： Cryan, R. A. Univ Huddersfield Sch Comp & Engn Huddersfield HD1 3DH W Yorkshire England

Shortened pulse position modulation (SPPM) is a new modulation format that has recently been proposed for underwater wireless optical communication. A full spectral characterisation of SPPM is considered and original expressions are presented, which are validated numerically for predicting both the continuous and the discrete spectrum.

关键词： SPPM optical communication pulse position modulation shortened pulse position modulation spectral analysis spectral characterisation underwater wireless optical communication

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ERROR CORRECTION, INTERLEAVING AND DIFFERENTIAL pulse position modulation

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INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS 1988年第2期6卷 173-187页

作者： PEILE, RE Communication Sciences Institute Department of Electrical Engineering — Systems University of Southern California Los Angeles CA 90089—0272 U.S.A. Visiting Associate Professor. Also consultant to Cyclotomics Inc.

AbstractThis paper discusses the interaction of error, correction, interleaving and modulation format in relation to intersatellite communication by optical technologies, concentrating on the performance and design of pulse position modulation and a variant, differential pulse position modulation with Reed—Solomon codes, helical interleaving and various forecast strategie

关键词： Error correction Interleaving pulse position modulation Synchronization Data integrity Throughput Capacity

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Performance enhancement of a time hopping - pulse position modulation ultra-wide-band system using guided local search

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IET COMMUNICATIONS 2011年第15期5卷 2212-2220页

作者： Naanaa, A. Belghith, S. Sys'com Laboratory Ecole Nationale d'Ingenieurs de Tunis (ENIT) Tunisia

In this study, the authors propose a method to minimise the multi-user interference (MUI) caused by multiple access (MA) in a time hopping ultra-wide-band (TH-UWB) system with line-of-sight (LOS) multi-path channel in a residential environment IEEE 802.15.4a channel model. The authors considered both synchronous and asynchronous cases. The problem is formulated as a combinatorial optimisation problem (COP) and solved by means of an efficient optimisation algorithm called guided local search (GLS). The optimisation criterion is the average collision number (ACN). The code optimisation method is validated by simulating the system and computing the binary error rate.

关键词： pulse position modulation time hopping Ultra wideband technologies enhancing performance Optimization algorithms optimal criterion

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The Gaussian free space optical MIMO channel with Q-ary pulse position modulation

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2008年第5期7卷 1744-1753页

作者： Letzepis, Nick Holland, Ian Cowley, William Univ S Australia Inst Telecommun Res Adelaide SA 5001 Australia

The main drawback in communicating via the free space optical (FSO) channel is the detrimental effect the atmosphere has on a propagating laser beam. Atmospheric turbulence causes random fluctuations in the irradiance of the received optical laser beam, commonly referred to as scintillation. This paper investigates the use of multiple lasers and multiple apertures to mitigate the effects of scintillation. In particular, the FSO multiple-input multiple-output (MIMO) channel with Q-ary pulse position modulation (QPPM) and transmit repetition under the assumption of non-ideal photodetection is analyzed in terms of its uncoded bit error rate (BER) and ergodic channel capacity. This analysis is based, in part, on the use of irradiance fluctuation samples that were obtained from a laser range experiment that was conducted in the presence of moderate turbulence conditions. Expressions are derived for the log-likelihood ratio (LLR) of a received bit, uncoded BER and ergodic capacity. Using these results it is shown that large gains are possible with the use of MIMO combined with strong coding techniques.

关键词： optical communication random media MIMO systems pulse position modulation Gaussian channels information theory

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