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检索条件"主题词=Modulation coding"

共 7024 条记录，以下是161-170 订阅

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A Tight Curve Warning System Using FSK Visible Light and Road-to-Vehicle Communication

A Tight Curve Warning System Using FSK Visible Light and Roa...

引用

IEEE 3rd Annual International Conference on Consumer Electronics - Berlin (ICCE-Berlin)

作者： Yoneda, Ryoichi Okuda, Kuniyoshi Uemura, Wataru Ryukoku Univ Otsu Shiga 5202194 Japan

ISBN: (纸本)9781479914128;9781479914111

Rolling accidents often happen on the tight curves, so road-to-vehicle communication is required. In this paper we apply visible light communication to road-to-vehicle communication and propose a tight curve warning system. We use the hierarchical coding of FSK because a receiver can receive both low frequency data and high frequency data when it is close to the sender, and it can receive only low frequency data when it is far away from the sender. We made a 1/32 scale prototype model and the experimental results show its ability to distinguish the communication distance from the frequency. The car on our prototype system put on its brakes 2 m from an LED using 16.6 kHz.

关键词： frequency shift keying light emitting diodes mobile radio modulation coding optical communication

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End-to-End Performance Analysis based on Cross-Layer Retransmission Scheme in Wireless Communication System

End-to-End Performance Analysis based on Cross-Layer Retrans...

引用

27th International Conference on Information Networking (ICOIN)

作者： Go, Kwang-Chun Cha, Jae-Ryong Oh, Seong Keun Kim, Jae-Hyun Ajou Univ Sch Elect & Comp Engn Suwon 443749 South Korea

ISBN: (纸本)9781467357425;9781467357401

To improve reliability of packet transmission, wireless communication systems use appropriate retransmission schemes based on characteristics of each protocol layer. In each protocol layer, retransmission schemes operate without cooperation of other layers. However, to improve system performance over wireless channel, a retransmission scheme of each protocol layer can use information on other protocol layers. For this reason, the cross-layer retransmission schemes recently have been proposed. The cross-layer retransmission scheme that is an retransmission scheme combined with adaptive modulation and coding (AMC) scheme can improve average spectral efficiency by considering both wireless channel state and parameters of a retransmission scheme. However, conventional researches concentrate on improving system performance over wireless channel and the end-to-end performance is not considered. It may be difficult to find an appropriate cross-layer retransmission scheme and system parameters for each service class. Thus, the end-to-end performance should be analyzed to decide whether the cross-layer retransmission schemes and parameters are suitable for each service class. In this paper, we analyze the end-to-end performance of wireless communication system using a cross-layer retransmission scheme and evaluate the system performance such as spectral efficiency, packet error rate (PER), and end-to-end throughput on transport layer. From the evaluation results, it can be seen that the end-to-end throughput of the hybrid automatic repeat request (HARQ) scheme combined with AMC is superior to that of automatic repeat request (ARQ) combined with AMC.

关键词： adaptive codes adaptive modulation automatic repeat request modulation coding protocols telecommunication network reliability wireless channels

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A Game Theoretical Approach for Reliable Packet Transmission in Noncooperative BIC-OFDM Systems

A Game Theoretical Approach for Reliable Packet Transmission...

引用

IEEE International Conference on Communications (ICC)

作者： Andreotti, Riccardo Lottici, Vincenzo Giannetti, Filippo Stupia, Ivan Vandendorpe, Luc Univ Pisa Dept Informat Engn I-56122 Pisa Italy Catholic Univ Louvain B-1348 Louvain Belgium

ISBN: (纸本)9781467331227

In this work, we investigate the power allocation (PA) problem aimed at minimizing the users' packet error rate (PER) over a noncooperative link, i.e., a link where the set of users, employing packet-oriented bit-interleaved coded (BIC) orthogonal frequency division multiplexing (OFDM) systems, compete for the same bandwidth. For these kind of systems, the PER is not available in closed-form, but a very efficient solution is offered by the effective SNR mapping (ESM) technique. This method allows each user to evaluate a single scalar value, the effective SNR (ESNR), accounting for all the SNIRs experienced over the active subcarriers, and to univocally map it into a PER value. Thus, in order to derive a decentralized strategy allowing each user to minimize its own PER, the problem is described as a strategic game, called min-PER game, with the set of player, utilities and strategies represented by the competitive users, the ESNRs and the set of feasible power allocations, respectively. We will show both the existence of at least one Nash Equilibrium (NE) for the min-PER game and its equivalence with a Nonlinear Variational Inequality (NVI) problem. Finally, relying on the theory of contraction mappings, we will derive a distributed algorithm to reach the NE of the game.

关键词： OFDM modulation game theory modulation coding radio links telecommunication network reliability

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An Efficient Design of Bit-Interleaved Polar Coded modulation

An Efficient Design of Bit-Interleaved Polar Coded Modulatio...

引用

IEEE 24th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Chen, Kai Niu, Kai Lin, Jia-Ru Beijing Univ Posts & Telecommun Minist Educ Key Lab Universal Wireless Commun Beijing 100876 Peoples R China

ISBN: (纸本)9781467362337

A new bit-interleaved polar coded modulation (BIPCM) scheme is proposed. To reduce the construction complexity, the simplest kernel matrix for channel polarization is adopted. And auxiliary virtual channels with zero-capacities are introduced to adapt different modulation orders. The underlying polar codes are efficiently constructed by calculating the Bhattacharyya parameters of equivalent binary-input erasure channels (BECs) rather than computing-expensive density evolution. Further, to avoid exhaustive searching, an empirically good channel mapping scheme is provided. Compared with the existing BIPCM schemes, the proposed scheme has a lower construction complexity and can achieve a better performance. With cyclic redundancy check (CRC) aided decoding algorithms, the block error rate (BLER) performance of our proposed BIPCM scheme can outperform the turbo coded modulation scheme used in WCDMA (Wideband Code Division Multiple Access) wireless communication system by up to 0.5dB.

关键词： WCDMA modulation coding energy-efficient design block error probability Scheme Polar Turbo coded modulation

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Universal Multiple Access via Spatially Coupling Data Transmission

Universal Multiple Access via Spatially Coupling Data Transm...

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IEEE International Symposium on Information Theory (ISIT)

作者： Truhachev, Dmitri Dalhousie Univ Dept Elect & Comp Engn Halifax NS B3H 3J5 Canada

ISBN: (纸本)9781479904464

We consider a signaling format where information is modulated via a superposition of independent data streams. Each data stream is formed by replication and permutation of encoded information bits. The relations between data bits and modulation symbols transmitted over the channel can be represented in the form of a sparse graph. The modulated streams are transmitted with time offsets enabling spatial coupling of the sparse modulation graphs. We prove that iterative demodulation based on symbol estimation and interference cancellation followed by parallel error correction decoding is a universal multiple access technique which achieves the entire capacity region of the additive white Gaussian noise (AWGN) multiple access channel.

关键词： AWGN channels channel capacity channel coding data communication demodulation error correction codes graph theory interference suppression iterative decoding modulation coding multi-access systems telecommunication signalling

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Nonlinear Transmission of 6PolSK-QPSK Signals using Coded modulation and Digital Back Propagation

Nonlinear Transmission of 6PolSK-QPSK Signals using Coded Mo...

引用

Conference on Optical Fiber Communication (OFC)/National Fiber Optic Engineers Conference (NFOEC)

作者： Tanimura, Takahito Alreesh, Saleem Fischer, Johannes Karl Schmidt-Langhorst, Carsten Frey, Felix Meuer, Christian Elschner, Robert Molle, Lutz Schubert, Colja Heinrich Hertz Inst Nachrichtentech Berlin GmbH Fraunhofer Inst Telecommun Dept Photon Networks & Syst D-10587 Berlin Germany

We experimentally investigate the characteristics of 126-Gb/s coded 6PolSK-QPSK signals in the nonlinear transmission regime and demonstrate that required OSNR improvement is increasing with fiber-launch power due to ... 详细信息

ISBN: (纸本)9781557529626;9781479904570

关键词： Nonlinear Transmission Signals modulation coding signals nonlinearity Digit Digital back propagation transmission

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Layered Schemes for Large-Alphabet Secret Key Distribution

Layered Schemes for Large-Alphabet Secret Key Distribution

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Information Theory and Applications Workshop

作者： Zhou, Hongchao Wang, Ligong Wornell, Gregory MIT Elect Res Lab Cambridge MA 02139 USA

ISBN: (纸本)9781467346481

We discuss the design of practical codes for large-alphabet secret key distribution, motivated by the application of high-dimensional quantum key distribution. We introduce and study a simple scheme called layered scheme, which can be treated as a variant of coded modulation. The idea of layered schemes is to first split the observed large-alphabet symbols into bit layers, and to then encode all the bit layers either independently or jointly using binary codes. The channels that we are interested in are more general than the AWGN channels or Rayleigh fading channels studied in coded modulation. We present and compare different implementations of layered schemes, i.e., based on independent parallel encoding or joint encoding, and we investigate different approaches in how to map large-alphabet symbols into bit layers. Both theoretical analyses and simulation results show that layered schemes have good performances on q-ary channels such as uniform-error channels and limited-magnitude-error channels.

关键词： binary codes modulation coding quantum cryptography

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Forward Link ACM for Satellite Communication Public Test-bed via COMS

Forward Link ACM for Satellite Communication Public Test-bed...

引用

IEEE International Conference on Consumer Electronics (ICCE)

作者： Ryu, Joon-Gyu Hong, Sung-Yong Oh, Deock-Gil Satellite Broadcasting &amp'||' '||' Telecommunication Convergence Team

ISBN: (纸本)9781467313636;9781467313612

This paper present the detailed design and the algorithm for forward link ACM(Adaptive coding & modulation) system to improve the link availability and system throughput in satellite communication services. To implement ACM system, the channel prediction and MODCOD decision methods is simulated. The channel prediction result shows that the 99% of predicted values in LMS(Least Mean Square) algorithm is within 3dB. Also this paper proposes the appropriate system architecture for ACM transmission.

关键词： adaptive codes least mean squares methods modulation coding satellite communication telecommunication network reliability

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A Wireless Address-Event Representation System for ATC-Based Multi-Channel Force Wireless Transmission

A Wireless Address-Event Representation System for ATC-Based...

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5th IEEE International Workshop on Advances in Sensors and Interfaces (IWASI)

作者： Ros, Paolo Motto Paleari, Marco Celadon, Nicolo Sanginario, Alessandro Bonanno, Alberto Crepaldi, Marco Ariano, Paolo Demarchi, Danilo Ist Italiano Tecnol PolitTo I-10129 Turin Italy

ISBN: (纸本)9781479900411;9781479900398

This paper extends Average Threshold Crossing (ATC) wireless transmission to a multi-channel case by using Address-Event Representation (AER) as the way to convey information. This is encoded in the timings of the transmitted packets which in turn carry the identifier of the event source. By integrating a Impulse Radio-Ultra Wide Band (IR-UWB) and choosing the proper protocol and modulation, we can aim to minimize the power consumption and provide error detection. The whole system, fully asynchronous, has been implemented in a full-custom chip;besides having multiple independent inputs, it can be configured both to deploy a multi-chip system (with a single receiver) and to optimize wireless transmission parameters. The paper concludes with additional theoretical simulations on the ATC scheme to justify further analyses for our specific application area which regards movement recognition.

关键词： biomedical communication electromyography modulation coding protocols radio transmitters ultra wideband communication wireless channels

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Coded Bit modulation for UWB Impulse Radio

Coded Bit Modulation for UWB Impulse Radio

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77th IEEE Vehicular Technology Conference (VTC)

作者： Maskooki, Arash Soh, Cheong Boon Gunawan, Erry Low, Kay Soon Nanyang Technol Univ Sch Elect & Elect Engn Singapore Singapore

ISBN: (纸本)9781467363372

In wireless sensor networks, nodes can retransmit their neighbours' packets to provide redundancy and decrease packet error rate. However, this comes at the expense of increased energy consumption in the cooperating nodes. Cooperation between nodes in routing data is a necessity in sensor networks. This work exploits features of UWB-IR modulations to create redundancy in wireless sensor networks. We introduce a physical layer coding framework for UWB-IR and compare it with conventional UWB-IR modulation in terms of energy usage. Simulation results show that the proposed methods can decrease the energy usage of the nodes while enhancing packet error rate performance of the system.

关键词： modulation coding ultra wideband communication wireless sensor networks

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