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检索条件"主题词=Modulation coding"

共 7025 条记录，以下是1631-1640 订阅

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Turbo Receiver Design with Carrier-Frequency Offset Estimation for LDPC-Coded MIMO OFDM Systems

Turbo Receiver Design with Carrier-Frequency Offset Estimati...

引用

International Conference on Advanced Communication Technology (ICACT)

作者： S. Salari M. Ardebilipour M. Ahmadian J.P. Cances V. Meghdadi Faculty of Electrical Engineering K.N. Toosi University of Technology Tehran Iran ENSIL-GESTE University of Limoges Limoges France

This paper proposes an iterative maximum a posteriori probability (MAP) receiver for low-density parity-check (LDPC)-coded multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems with the presence of carrier-frequency offset (CFO). The turbo receiver employs the expectation maximization (EM) algorithm so as to improve the performance of the approximated MAP detection, and applies a pilot-aided CFO estimator which can work well with the EM algorithm. Simulation results show the effectiveness of our turbo receiver design in combating CFO over unknown frequency selective fading channels.

关键词： MIMO OFDM Fading Parity check codes Decoding modulation coding AWGN Remuneration Receivers Wireless sensor networks

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Experimental observation of modulational instability in the 1st and 2nd band of a self-defocusing nonlinear waveguide array

Experimental observation of modulational instability in the ...

引用

Quantum Electronics and Laser Science Conference (QELS)

作者： Christian E. Rueter Juergen Wisniewski Detlef Kip Institut of Physics and Physical Technologies Clausthal University of Technology Leibnizstraße 4 D-38678 Zellerfeld Germany Institut of Physics and Physical Technologies Clausthal University of Technology Clausthal-Zellerfeld Germany

We observed experimentally discrete modulational instability within the first two bands in a permanent nonlinear waveguide array fabricated in an iron-doped photorefractive lithium niobate crystal.

ISBN: (纸本)1557528349

We observed experimentally discrete modulational instability within the first two bands in a permanent nonlinear waveguide array fabricated in an iron-doped photorefractive lithium niobate crystal.

关键词： Optical waveguides Optical arrays Pulse modulation Nonlinear optics Optical surface waves modulation coding Photorefractive materials Lithium niobate Optical solitons Optical propagation

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Improved Detection of Differential Space-Time Block Codes

Improved Detection of Differential Space-Time Block Codes

引用

IEEE Conference on Wireless Communications and Networking

作者： Yun Zhu Hamid Jafarkhani Department of Electrical Engineering & Computer Science University of California Irvine Irvine CA USA

In this paper, the authors derive an improved sub-optimal differential detector for space-time block codes based on the maximum-likelihood detection when neither the transmitter nor the receiver has the knowledge of the channel. The proposed detection method is general enough to be applied to orthogonal space-time block codes, quasi-orthogonal space-time block codes and quasi-orthogonal space-time block codes with minimum decoding complexity. Compared with the existing sub-optimal schemes, the improved scheme can provide better error performance with acceptably increased decoding complexity. Simulation results show that the performance of the proposed detector is close to that of the maximum-likelihood detector without the knowledge of the received SNR. In addition, the performance improvement over the existing schemes becomes more significant as the transmission rate increases.

关键词： Block codes Maximum likelihood decoding Detectors Transmitting antennas modulation coding Receiving antennas Maximum likelihood detection Transmitters Maximum likelihood estimation Fading

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GNSS Signals Characteristics

GNSS Signals Characteristics

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International Conference on Radioelektronika

作者： Petr Kacmarik Pavel Kovar Department of Radio Electronics Czech Technical University Praque Czech Republic

ISBN: (纸本)1424408210

The paper deals with second order signals characteristics for satellite navigation systems. The main goal of the paper is to simplify and clarify signals analysis task by introducing a system of signals characteristics and their mutual relations. The conception of the system is based on the fact that the structure of navigation signals is partially given since the signals should ensure reliable pseudorange estimations. The proposed conception is then applied on the tiered code construction employed in Galileo system. Finally it is shown that the results of the tiered code analysis can be used in case of the power spectra estimation of BOC modulated signals.

关键词： Satellite navigation systems Baseband Signal analysis Equations modulation coding Global Positioning System Power system reliability Autocorrelation Digital modulation Random sequences

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A New Transmit Diversity Scheme based on Cyclic Precoding Vectors for Flat Fading Channels

A New Transmit Diversity Scheme based on Cyclic Precoding Ve...

引用

IEEE 65th Vehicular Technology Conference (VTC-Spring 2007), vol.5

作者： Kyoung-Jae Lee Heunchul Lee Seokhwan Park Inkyu Lee School of Electrical Engineering Korea University Seoul South Korea

In this paper, we propose a new transmit diversity technique for multiple-input multiple-output (MIMO) systems to improve the link level performance of open-loop systems over flat fading channels. By cyclically applying a predetermined set of precoding weight vectors, artificially induced fluctuation is created to achieve additional diversity gain in flat fading channels. To design the set of the precoding vectors, we exploit the knowledge on the distribution of near optimum precoding vectors observed in a beamforming scheme based on the rotation transformations. Simulation results demonstrate that the proposed open-loop diversity scheme with an arbitrary number of transmit antennas achieves a full diversity gain with computational complexity comparable to a single-input single-output (SISO) system.

关键词： Fading Diversity methods Transmitting antennas MIMO Array signal processing Decoding Receiving antennas modulation coding Diversity reception Fluctuations

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Channel Estimation for SIR Measurement in HSDPA Systems

Channel Estimation for SIR Measurement in HSDPA Systems

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IEEE Conference on Vehicular Technology (VTC)

作者： Akira Ito Masahiko Shimizu Fujitsu Laboratories Limited Yokosuka Japan

To achieve good throughput performance and small delay, HSDPA are introduced in WCDMA systems. One of the key features of HSDPA is adaptive modulation and coding (AMC), which involves adaptively changing the transport format according to the condition of the receiver. To decide the transport format, the mobile station should measure SIR and send CQI (channel quality indicator) based on the SIR value. This paper proposes a method of SIR measurement for CQI in HSDPA systems. We also show that straightforward implementation of SIR measurement causes performance degradation for the high speed moving environment, and propose a new SIR measurement method. Specifically we propose a new channel estimation method for interference measurement. In this method, only the CPICH symbol within a measurement period is used for channel estimation while the reference signal for interference is still a moving average. We show by simulation that the throughput of the proposed method is 50% better than that of a conventional method under a high speed moving environment.

关键词： Channel estimation Multiaccess communication Interference Power measurement Particle measurements Throughput Equations modulation coding Velocity measurement Fluctuations

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BICM in Hybrid ARQ with Mapping Rearrangement: Capacity and Performance of Practical Schemes

BICM in Hybrid ARQ with Mapping Rearrangement: Capacity and ...

引用

IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference

作者： Leszek Szczecinski Fatout-Kine Diop Mustapha Benjillali Andres Ceron Rodolfo Feick INRS-EMT University of Quebec Montreal Canada UTFSM Valparaiso Chile

Hybrid ARQ with packet combining for high-order modulations (such as 16-QAM) may be significantly enhanced if the bits-to-symbols mappings are appropriately changed throughout the transmissions. In this paper, we analyze the relationship between such mapping rearrangement (or mapping diversity) and channel coding. We calculate the capacity of the popular bit-interleaved coded modulation (BICM) to draw qualitative and approximate quantitative conclusions that are valid for strong codes approaching the capacity limits. We conclude that the choice/design of the appropriate mapping depends on the targeted spectral efficiency and we demonstrate that certain forms of mapping rearrangement may be counterproductive. We also show that iterative demapping may be successfully applied to significantly reduce the gap between the BICM and coded modulations capacities. The analysis presented is illustrated with the results obtained when the mapping rearrangement is combined with practical turbo codes.

关键词： Automatic repeat request Channel coding modulation coding Multiaccess communication Performance analysis Diversity reception Interleaved codes Fading AWGN Quadrature amplitude modulation

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Cascaded modulation Scheme for Optical Multi-Channel Signal Transmission Systems

Cascaded Modulation Scheme for Optical Multi-Channel Signal ...

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Optical Fiber Communication (OFC) Conference

作者： Koji Kikushima Toshihito Fujiwara Satoshi Ikeda Access Network Service Systems Laboratories Chiba Chiba Japan

We report a cascaded modulation scheme that uses multiple concatenated external modulators to modulate continuous wave light. It offers better modulation performance than the conventional single modulation scheme for ... 详细信息

ISBN: (纸本)1557528306

关键词： Optical modulation Optical distortion Frequency conversion Frequency modulation Distortion measurement modulation coding Optical receivers Intensity modulation RF signals Optical frequency conversion

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Angle of arrival extended S-V model for the 60 GHz wireless indoor channel

Angle of arrival extended S-V model for the 60 GHz wireless ...

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Australasian Telecommunication Networks and Applications Conference, ATNAC

作者： C. Liu E. Skafidas R.J. Evans National ICT Australia Department of Electrical and Electronic Engineering University of Melbourne Parkville VIC Australia

In this paper we measure and characterize 55-65 GHz wireless channels for a typical indoor environment. An Angle of Arrival (AoA) Modified Saleh-Valenzuela (S-V) model is used. Key AoA Modified S-V model parameters such as cluster decay factor, ray decay factor, cluster arrival rate, ray arrival rate and aoa ray angular standard deviation are extracted from the measured data.

关键词： Radioactive decay Data mining Indoor environments Measurement standards Wideband Electric variables measurement Europe Australia Wireless communication modulation coding

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Signal Superposition Coded Cooperative Diversity: Analysis and Optimization

Signal Superposition Coded Cooperative Diversity: Analysis a...

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IEEE (first ITW conference of the year) Information Theory Workshop (ITW)

作者： Lei Xiao Thomas E. Fuja Jorg Kliewer Daniel J. Costello Department of Electrical Engineering University of Notre Dame Notre Dame IN USA

The performance of a coded cooperative diversity system employing the Euclidean superposition of two BPSK- modulated signals is analyzed. For an example using a convolutional code on block fading channels, the results show excellent agreement with computer simulations. The analysis makes it possible to optimize the power allocation between the local and relay signals numerically, circumventing the need for time consuming Monte Carlo simulations.

关键词： Signal analysis Relays Power system relaying Performance analysis Signal design Fading Error analysis modulation coding Pulse modulation Lakes

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