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检索条件"主题词=modulation coding"

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An error correcting neural network

An error correcting neural network

引用

IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

作者： J. Yuan V.K. Bhargava Q. Wang Department of Electrical & Computer Engineering University of Victoria Victoria BC Canada

The behavior of a particular class of neural networks and their application to error control coding are discussed. It is proved that the net is able to perform analog error correction without hanging up at some undesired states-an annoying event that occurs occasionally in Hopfield (1982) nets. The corresponding code is a balanced code which has a significantly higher rate than Hopfield's 1-in-N code. Accordingly, the product of balanced code has a higher rate and better error correcting ability than Hopfield's permutation N*N code. The application of the code to combined modulation and channel coding for a 4-ary channel is discussed.< >

关键词： Error correction Neural networks Neurons Error correction codes Pattern recognition Probes Computer errors Application software modulation coding Channel coding

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Interference avoidance for wireless systems

Interference avoidance for wireless systems

引用

IEEE Conference on Vehicular Technology (VTC)

作者： C. Rose S. Ulukus R.D. Yates WINLAB Rutgers University USA AT and T Research Laboratories USA

Motivated by the emergence of programmable radios, we seek to understand a new class of communication system where pairs of transmitters and receivers can adapt their modulation/demodulation method in the presence of interference to achieve better performance. Using the signal to interference ratio as a metric and a general signal space approach, we present a class of iterative distributed algorithms for synchronous systems which results in an ensemble of optimal waveforms for multiple users connected to a common receiver (or co-located independent receivers). That is, the waveform ensemble meets the Welch (1974) bound with equality and therefore achieves minimum average interference over the ensemble of signature waveforms. We describe fixed points for a number of scenarios.

关键词： Interference Radio transmitters Multiaccess communication modulation coding Extraterrestrial measurements Iterative methods Signal design Signal processing Adaptive equalizers Amplitude shift keying

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Variable length space time coded modulation

Variable length space time coded modulation

引用

IEEE Conference on Vehicular Technology (VTC)

作者： S.X. Ng J. Wang L.-L. Yang L. Hanzo School of ECS University of Southampton UK

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BER bounds for turbo coded modulation and their application to adaptive modulation

BER bounds for turbo coded modulation and their application ...

引用

IEEE International Symposium on Information Theory

作者： S. Vishwanath A. Goldsmith Packard Electrical Engineering Stanford CA USA

We present upper bounds for bit error rates of turbo coded modulation (TuCM) on AWGN channels. We then apply these bounds to calculate the spectral efficiency of adaptive TuCM on flat fading channels, which comes with... 详细信息

关键词： modulation coding Bit error rate Turbo codes Transfer functions Upper bound AWGN channels Fading Channel capacity Convolutional codes Error correction codes

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Prompt Rate Adaptation in WiMedia Considering Time Variant UWB Channels

Prompt Rate Adaptation in WiMedia Considering Time Variant U...

引用

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

作者： Karsten Schoo Janne Tervonen Nokia Research Center Bochum Germany Nokia Siemens Networks Helsinki Finland

In this paper the performance of the rate adaptation scheme specified by the WiMedia Alliance is investigated and a new, fast link feedback mechanism is proposed, which can be implemented without major modifications of the existing WiMedia UWB standard. After introducing the considered link adaptation mechanisms, a time variant UWB channel model is derived. Basic properties of UWB channels are summarized and the widely used IEEE 802.15.3a channel models are enhanced with respect to correlated variations in time domain. The delay caused by the link feedback scheme and the channel fluctuations are of paramount importance for the overall performance. Both link feedback mechanisms are modeled using the specified PHY layer and they are compared against each other in short-range scenarios based on real measurements. It was found that rate adaptation in general provides large gains in WiMedia UWB and that the fast link feedback scheme outperforms the standardized mechanism in case of swift channel variations. Consequently, the new scheme is seen as a general enhancement for mobile UWB devices.

关键词： Feedback Physical layer Fluctuations Interleaved codes Throughput Fading modulation coding Frequency conversion Land mobile radio Mobile communication

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The Capacity Of A Channel With Gaussian Noise And Intersymbol Interference

The Capacity Of A Channel With Gaussian Noise And Intersymbo...

引用

IEEE International Symposium on Information Theory

作者： P. Algoet J. Cioffi Information Systems Laboratories Stanford CA USA

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Adaptive signaling schemes with imperfect channel-quality estimates in wireless CDMA communications

Adaptive signaling schemes with imperfect channel-quality es...

引用

MILCOM, Military Communications Conference

作者： J.M. Shea Department of Electrical and Computer Engineering University of Florida Gainesville FL USA

ISBN: (纸本)0780365216

Adaptive signaling techniques can be used to more-efficiently utilize system resources in wireless communication systems. We have previously shown that adaptive signaling with non-uniform M-ary phase-shift-keying can improve the throughput in a CDMA wireless communication system. This additional throughput can be used to include a second multimedia message, called an additional message, along with the standard message that would be transmitted without the use of adaptive signaling. The schemes that we have investigated adapt the spacing of points in the signal constellation and the code rate and signaling rate for the additional message. Techniques that employ only adaptation of the code rates for both messages have also been suggested to achieve this same goal. In this paper we analyze the effects of imperfect channel estimates on the performance of adaptive signaling schemes that use nonuniform signaling and schemes that adapt only the code rate. The results show that, in a variety of situations, the nonuniform signaling schemes provide a higher throughput than the schemes that use uniform constellations. We also analyze the effect of using code-combining automatic repeat request (ARQ) with these adaptive techniques.

关键词： Wireless communication Multiaccess communication Phase shift keying Throughput Interference Constellation diagram Automatic repeat request modulation coding Quality of service Signal analysis

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Developing a low-cost GPS receiver for marine applications

Developing a low-cost GPS receiver for marine applications

引用

IEEE Symposium on Position Location and Navigation (PLANS)

作者： T. Curry F. Cassidy Southeastern Massachusetts University North Dartmouth MA USA Datamarine International Inc. Pocasset MA USA

The authors describe a state sponsored, industry/university partnership aimed at developing a low-cost GPS (Global Positioning System) receiver in the nonmilitary low dynamic environment. Such platforms include those found in recreational and commercial maritime applications, and those that might be used in automobiles and small aircraft. The objectives of the project are detailed as are the requirements analysis and definition, including both performance- and nonperformance-related requirements, to set the stage for the design approach. Conventional approaches in acquiring and tracking the GPS signal are discussed along with other techniques that are potentially less costly. The microwave electronics and the acquisition/tracking functions have been identified as critical subsystems in the context of the project objectives.< >

关键词： Global Positioning System Satellite broadcasting Industrial economics Marine technology Extraterrestrial measurements Position measurement Velocity measurement Time measurement modulation coding Automobiles

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A hierarchical image transmission system in a fading channel

A hierarchical image transmission system in a fading channel

引用

International Conference on Universal Personal Communications

作者： M. Morimoto M. Okada S. Komaki Department of Electrical Engineering Faculty of Engineering Osaka University Suita Osaka Japan

This paper proposes a new mobile image transmission system based on the hierarchical modulation scheme for achieving a high quality and high speed digital image transmission in a band-limited fading channel. The proposed system uses a hierarchical QAM (quadrature amplitude modulation) scheme to give unequal transmission reliability depending on the importance of DCT (discrete cosine transform)-based compressed images. Numerical analysis shows that the proposed system is an effective high-quality and high-speed image transmission technique in a fading channel.

关键词： Image communication Fading Image coding Discrete cosine transforms Quadrature amplitude modulation modulation coding Mobile communication Frequency Bandwidth Source coding

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QoS-guaranteed cross-layer adaptive transmission algorithms for the IEEE 802.16 OFDMA system

QoS-guaranteed cross-layer adaptive transmission algorithms ...

引用

IEEE Conference on Wireless Communications and Networking

作者： S.A. Filin S.N. Moiseev M.S. Kondakov A.V. Garmonov Do Hyon Yim Jaeho Lee S. Chang Yun Sang Park JSC Kodofon Voronezh Russia SAMSUNG Electronics Co. LTD Suwon-city Korea

In this paper, we analyze the IEEE 802.16 OFDMA system with the frequency diversity frame structure. We perform adaptive coding and modulation, allocation of the time-frequency resource and transmit power to the downlink and uplink service flows, which are scheduled for transmission in the current frame. Also, we consider adaptation of the frame boundary between the downlink and uplink subframes. We minimize the sum time-frequency resource, allocated in both downlink and uplink subframes, under the constraints on the maximum transmit power and the time-frequency resource, available in the frame, while satisfying the QoS requirements for all downlink and uplink service flows, scheduled for transmission. We propose the cross-layer optimization algorithms, which take into account the MAC and PHY layers processing during the optimization

关键词： Frequency diversity Physical layer OFDM Resource management Downlink modulation coding Time frequency analysis Adaptive coding Programmable control Adaptive control

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