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检索条件"主题词=Modulation coding"

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A gaze prediction technique for open signed video content using a track before detect algorithm

A gaze prediction technique for open signed video content us...

引用

IEEE International Conference on Image Processing

作者： S.J.C. Davies D. Agrafiotis C.N. Canagarajah D.R. Bull Department of Electrical and Electronic Engineering University of Bristol Bristol UK

This paper proposes a gaze prediction model for open signed video content. A face detection algorithm is used to locate faces across each frame in both profile and frontal orientations. A grid-based likelihood ratio track before detect routine is used to predict the orientation of the signer's head, which allows the gaze location to be localised to either the signer or the inset. The face detections are then used to narrow down the gaze prediction further. The gaze predictor is able to predict the results of an eye tracking study with up to 95% accuracy, and an average accuracy of over 80%.

关键词： Handicapped aids Face detection Video coding Multimedia communication Broadcasting Electronic mail Predictive models modulation coding Protection Detectors

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modulation codes for reader-tag communication on inductively coupled channels

Modulation codes for reader-tag communication on inductively...

引用

International Symposium on Information Theory and Its Applications, ISITA

作者： Angela I. Barbero Greg D. Horler Eirik Rosnes Oyvind Ytrehus Department of Applied Mathematics University of Valladolid Valladolid Spain Instrumentel and School of Electronic & Electrical Engineering University of Leeds UK

In this paper we study and compare methods for representing information for transmission on inductively coupled channels. We introduce combined runlength and power constraints on modulation codes for such channels, ca... 详细信息

ISBN: (纸本)9781424420681

关键词： modulation coding Amplitude modulation Costs Error correction codes Signal to noise ratio Additive noise Decoding Frequency synchronization Timing Couplings

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A Cross-Layer Link Adaptation Algorithm for IEEE 802.11 WLAN with Multiple Nodes

A Cross-Layer Link Adaptation Algorithm for IEEE 802.11 WLAN...

引用

IEEE Asia-Pacific Conference on Services Computing (APSCC)

作者： Chiapin Wang Tsungnan Lin Department of Applied Electronic Technology National Taiwan Normal University Taipei Taiwan Department of Electrical Engineering National Taiwan University Taipei Taiwan

IEEE 802.11 wireless local area network (WLAN) physical layer (PHY) offers multiple data rates. In multi-rate WLANs, 802.11 distributed coordination function (DCF) presents the phenomenon so called ldquoperformance anomalyrdquo: when some hosts transmit at lower data rates, throughput of others at high rates will be restricted within the lowest rate, leading to the degradation of overall performance. Therefore, the link adaptation scheme for 802.11 WLAN should consider not only throughput of the observed host but also system throughput in order to optimize the overall performance. In this paper we propose a cross-layer link adaptation algorithm which improves system throughput by regarding the situation of PHY rate degradation more thoughtfully and critically, and meanwhile compensates the throughput of hosts with bad link qualities by applying differentiated channel access parameters. Simulation results demonstrate the effectiveness of the propose algorithm.

关键词： Wireless LAN Throughput Physical layer Degradation Media Access Protocol Access protocols Large-scale systems Aggregates Handheld computers modulation coding

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Multiplexing precoding scheme for STC-CPM with parametric phase discriminator IWM receiver

Multiplexing precoding scheme for STC-CPM with parametric ph...

引用

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

作者： Jan Sykora Robert Schober Czech Technical University Czech Republic University of British Columbia Canada

A constant envelope continuous phase modulation (CPM) class of Multi-Channel (MC) modulations for multi-antenna transmitters is considered. Each receive antenna receives a superposition of CPM waveforms. The useful signal at the receiver spans a curved space - the information waveform manifold (IWM). Particularly it has the form of a cylinder on a cylinder for 2-component CPM signals. At the receiver, we use a nonlinear preprocessor consisting of a nonlinear projector on the IWM, optional processing on the curved space, and a decoding isomorphism. A particular form of the preprocessor, the 2-component IWM phase discriminator, is analyzed. We show that the discriminator can separate individual instantaneous phases of the component CPM modulations and therefore has multiplexing capabilities with respect to the individual transmitted components. Two parallel channels are created without the need for a time domain processing since the procedure fully relies on the curved space properties of the IWM, and thus can be combined with arbitrary outer space-time coding of MC-CPM. An information theoretic analysis of the multiplexing properties based on the mutual information regions is presented. The discriminator solution has a two-fold ambiguity. We show that the discriminator provides good separation of component phases conditioned on a perfect ambiguity resolution. We propose a transmit spatial-differential precoding scheme that allows the ambiguity resolution.

关键词： Signal processing Transmitters Decoding MIMO Continuous phase modulation Receiving antennas Spatial resolution Transmitting antennas modulation coding Phase modulation

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Performance analysis of adaptive low rate differential CSI feedback for MIMO-OFDM systems

Performance analysis of adaptive low rate differential CSI f...

引用

International Symposium on Wireless Pervasive Computing (ISWPC)

作者： Woon Hau Chin Chau Yuen Modulation and Coding Department Institute for Infocomm Research Singapore

In situations where the channels are fast changing, systems that require channel state information at the transmitter would need frequent feedback from the receiver. Low rate feedback will be required in these cases, and there have been many proposals on how to compress channel state information to enable a fast feedback to the transmitter. Of these proposed methods, a simple but yet promising way to achieve low rate feedback would be via the use of differential quantization techniques. In this paper, we investigate the use of adaptive delta modulation with givens rotation to encode the CSI in MIMO-OFDM systems. We look at the design of the feedback system, and investigate methods of improving the performance of such systems.

关键词： Performance analysis State feedback Delta modulation modulation coding Channel state information Transmitters OFDM Fading Speech coding Pulse modulation

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Impact of 4G wireless link configurations on VoIP network performance

Impact of 4G wireless link configurations on VoIP network pe...

引用

International Symposium on Wireless Communication Systems (ISWCS)

作者： Stefan Alfredsson Anna Brunstrom Mikael Sternad Computer Science Karlstad University Karlstad Sweden Signals and Systems University of Uppsala Uppsala Sweden

The performance of applications in wireless networks is partly dependent upon the link configuration. Link characteristics varies with frame retransmission persistency, link frame retransmission delay, adaptive modulation strategies, coding, and more. The link configuration and channel conditions can lead to packet loss, delay and delay variations, which impact different applications in different ways. A bulk transfer application may tolerate delays to a large extent, while packet loss is undesirable. On the other hand, real-time interactive applications are sensitive to delay and delay variations, but may tolerate packet loss to a certain extent. This paper contributes a study of the effect of link frame retransmission persistency and delay on packet loss and latency for real-time interactive applications. The results indicate that a reliable retransmission mechanism with fast link retransmissions in the range of 2-8 ms is sufficient to provide an upper delay bound of 50 ms over the wireless link, which is well within the delay budget of voice over IP applications.

关键词： Delay OFDM Telecommunication traffic Throughput Wireless networks Internet telephony Proposals Computer science Application software modulation coding

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Channel aware scheduling in MIMO based WLANs in the presence of channel uncertainty

Channel aware scheduling in MIMO based WLANs in the presence...

引用

International Symposium on Wireless Communication Systems (ISWCS)

作者： Jelena Mirkovic Bernhard Walke Jordi Gomez Garcia ComNets Faculty 6 RWTH Aachen University Aachen Germany

In this paper system level performance evaluation of channel aware schedulers that apply previously presented multiple input-multiple output (MIMO) link adaptation algorithms is given. The analyzed schedulers operate in single-user (SU) and in multi-user (MU) mode, and adapt either only modulation and coding scheme, or MIMO scheme in addition. The performance evaluation is done by comparative analysis of saturation throughput achievable by different schedulers, investigating the impact of MU diversity and channel uncertainty.

关键词： MIMO Uncertainty modulation coding Physical layer Signal processing algorithms Receiving antennas Scheduling algorithm Throughput Quality of service Space technology

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Golden space-time block coded modulation

Golden space-time block coded modulation

引用

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

作者： Laura Luzzi Ghaya Rekaya-Ben Othman Jean-Claude Belfiore Emanuele Viterbo Télécom ParisTech-École Nationale Supérieure des Télécommunications Paris France DEIS-Università della Calabria Rende Cosenza Italy

We consider a block coded modulation scheme for a 2 times 2 MIMO system over slow fading channels, where the inner code is the Golden Code. The scheme is based on a set partitioning of the Golden Code using two-sided ideals. A lower bound for the minimum determinant is given by the minimum Hamming distance. Performance simulations show that our GCRS schemes achieve a significant gain over the uncoded Golden Code.

关键词： modulation coding Block codes Fading Algebra Hamming distance MIMO Hamming weight Error correction codes Reed-Solomon codes Helium

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Hardware implementation of software radios

Hardware implementation of software radios

引用

Proceedings of the Mosharaka International Conference on Communications, Signals and coding, MIC-CSC

作者： Mohamed Nezami Mamoun Private University for Science & Technology Syria

This presentation will deal with the concept of building software radios (SDR) for multi-standard communication terminals. First the session will cover the subsystem details of software radios. Signal transmission and reception in in both transmitters and receivers will be covered. Various aspects of digital signal processing algorithm implementations will then be covered. Topics such as modulation and demodulation, coding and decoding, linearization, synchronization will be dealt with in details. Finally a wide overview of commercially available SDR implementation platforms for research purposes will be presented.

关键词： Hardware Software radio Radio transmitters Digital signal processing Signal processing algorithms modulation coding Demodulation Decoding Biographies Strontium

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Incorporating retransmission diversity in quality-of-service guaranteed multi-user scheduling

Incorporating retransmission diversity in quality-of-service...

引用

Annual Conference on Information Sciences and Systems (CISS)

作者： Xin Wang Di Wang Irena Li Hanqi Zhuang Salvatore D. Morgera Department of Electrical Engineering Florida Atlantic University Boca Raton FL USA

A cross-layer optimization combining retransmission diversity with multi-user diversity is investigated for wireless communications. To this end, a joint design of adaptive modulation and coding with retransmission-based automatic repeat request protocol is first outlined. This design is then employed to devise multi-user scheduling schemes which can optimally capture the available multiuser and retransmission diversities. In addition, the proposed on-line scheduling algorithms can operate even when the underlying fading channel distribution is unknown a priori, while asymptotically converging to the offline benchmark with guarantees on prescribed fairness and rate requirements. Numerical results are provided to verify the merits of our novel schemes for multi-user transmissions over Nakagami block fading channels.

关键词： Quality of service Diversity reception Automatic repeat request Fading modulation coding Scheduling algorithm Cross layer design Media Access Protocol Physical layer Government

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