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A novel video communication system utilizing adaptive and integrated system design for mobile wireless ATM

A novel video communication system utilizing adaptive and in...

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： J. Vass X. Zhuang *** Network Inc. West Vancouver BC Canada Department of Computer Engineering & Computer Science Multimedia Communications and Visualization Laboratory Columbia MO USA

An adaptive and integrated video communication system is proposed for wireless ATM. Video received from the wireline source is adapted at the base station to both the hardware capabilities of mobile host and time-varying wireless channel conditions. Following the application level framing principle, source coding, channel coding, and packetization are jointly implemented as part of the application and only simple services are requested from the underlying wireless network infrastructure. Highly efficient and robust source coding, channel coding, and packetization techniques are also proposed. For source coding, we propose to use our three-dimensional significance-linked connected component analysis video codec. For channel coding and packetization, both intracell and interlaced (intercell) forward error correction are applied. Furthermore, the time-varying channel characteristics is exploited by adaptively allocating the total bit budget between source coding and channel coding. Performance evaluation demonstrates the effectiveness of the proposed wireless video communication system.

关键词： Adaptive systems Source coding Channel coding Base stations Hardware Wireless networks Robustness Video codecs Forward error correction Time-varying channels

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Using root distribution of specific functions in signal recovery from nonuniform samples

Using root distribution of specific functions in signal reco...

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Canadian Conference on Electrical and computer engineering (CCECE)

作者： Romero Plotkin Swamy Centre for Signal Processing and Communications Department of Electrical & Computer Engineering Concordia University Montreal QUE Canada

This article presents a new procedure for the recovery of a signal from its nonuniform samples based on the root distribution of a given function; as an example, an orthonormal sampling expansion analogue to the Shannon expansion is shown to be useful in the recovery. We also extend the concept of a "bandlimited signal" to transformed domains other than the Fourier domain.< >

关键词： Signal sampling/reconstruction Functions Bandlimited signals Polynomials Transforms

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Traffic modeling in a multi-media environment

Traffic modeling in a multi-media environment

引用

Canadian Conference on Electrical and computer engineering (CCECE)

作者： S.N. Subramanian Tho Le-Ngoc Center for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

Proposes a new model for characterizing the data traffic in a multi-media environment. The authors model the data traffic by a two-state doubly stochastic Poisson process, with sojourn times in each state having an independent and identical heavy tailed distribution, such as the Pareto distribution. The simulation results from the new data traffic model are presented. The new model is versatile in capturing the self-similar characteristics of traffic found in the traffic measurements. The authors also suggest that the other two types of multi-media traffic namely, voice and video may each be characterized by a 2-state doubly stochastic Poisson process with exponential sojourn times (i.e., a Markov modulated Poisson process or MMPP).

关键词： Traffic control Multimedia communication Stochastic processes Packet switching Telecommunication traffic Communication system traffic control Signal processing Electronic mail B-ISDN Jitter

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Optimal pilot-to-data power ratio for MIMO-OFDM

Optimal pilot-to-data power ratio for MIMO-OFDM

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： Taeyoon Kim J.G. Andrews Wireless Networking and Communications Group Department of Electrical and Computer Engineering University of Texas Austin TX USA

Orthogonal frequency division multiplexing (OFDM) can be used with a multiple-input multiple-output (MIMO) system to improve communication quality and capacity. Pilot-symbol-aided or decision-directed channel estimation must be used to track channel variations in MIMO-OFDM systems. While pilot symbols facilitate channel estimation, they reduce the transmit energy for data symbols under a fixed total transmit power constraint. We analyze the effects of pilot-symbol-aided channel estimation on the lower bound of the capacity and derive the optimal pilot-to-data power ratio (PDPR) in MIMO-OFDM systems with three different types of pilot patterns: independent, scattered, and orthogonal. The result implies that implementing the optimal PDPR in an actual MIMO-OFDM system should prove relatively straightforward, since there is a surprisingly broad range of PDPR values over which near optimal capacity is achieved.

关键词： Channel estimation OFDM Receiving antennas MIMO Pattern analysis Wireless communication Scattering Diversity reception Transmitting antennas Robustness

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Low-Complexity SQR-Based Decoding Algorithm for Quasi-Orthogonal Space-Time Block Codes

Low-Complexity SQR-Based Decoding Algorithm for Quasi-Orthog...

引用

IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference

作者： Luay Azzam Ender Ayanoglu Center for Pervasive Communications and Computing Department of Electrical Engineering and Computer Science University of California Irvine USA

In this paper, we propose a new decoding algorithm for quasiorthogonal space-time block codes (QOSTBCs) which achieves near maximum likelihood (ML) performance while substantially reducing the decoding complexity. We show that for a system with rate r = n s /T, where n s is the number of transmitted symbols per T time slots; the proposed algorithm decomposes the original complex-valued system into a parallel system with n s 2times2 real-valued components, thus allowing for a simple decoding of one real symbol at a time. For a square QAM constellation with L points (L-QAM), this algorithm achieves full diversity by properly incorporating two-dimensional rotation using the optimal rotation angle and the same rotating matrix for any number of transmit antennas (Nges4). We show that the complexity of this algorithm is linear with the number of transmitted symbols n s , and is independent of the constellation size L.

关键词： Block codes Maximum likelihood decoding Constellation diagram Maximum likelihood detection Transmitting antennas Pervasive computing Multidimensional systems Lattices Space time codes MIMO

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An approach to ARMA system identification at a very low signal-to-noise ratio

An approach to ARMA system identification at a very low sign...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： S.A. Fattah W.-P. Zhu M.O. Ahmad Centre for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

A new approach for the identification of minimum-phase autoregressive moving average (ARMA) systems in the presence of heavy noise is presented in this paper. A damped sinusoidal (DS) model for the autocorrelation function of a noise-free ARMA signal is proposed to estimate the AR parameters, which overcomes the failure of conventional correlation based techniques in estimating the AR parameters of an ARMA system at a very low signal-to-noise ratio (SNR). The MA parameters of the ARMA system are then estimated by using Durbin's method along with an optimum order selection criterion. Both white noise and periodic impulse train excitations are considered for the application of the proposed method to system identification as well as to speech processing. computer simulations are carried out based on both synthetic ARMA systems and natural speech signals, showing superior identification results even at an SNR of -5 dB for which most of the existing methods would fail.

关键词： System identification Signal to noise ratio Parameter estimation Autoregressive processes Autocorrelation White noise Application software Speech processing computer simulation Natural languages

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Shared media space coordination: mixed mode synchrony in collaborative multimedia environments

Shared media space coordination: mixed mode synchrony in col...

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IEEE International Conference on Multimedia Computing and Systems (ICMCS)

作者： W. Robbins N.D. Georganas Multimedia Communications Research Laboratory Department of Electrical and Computer Engineering University of Ottawa Ottawa ONT Canada

Multimedia systems are often divided into presentational and conversational domains: those which orchestrate prerecorded scenarios and those which provide audio/video teleconferencing. To be effective across a wide range of activities, however, collaborative multimedia systems must support the integration of presentational, conversational and interactive multimedia within a single shared media space. Such a virtual environment must not only support synthetic and real-time media but also their interactive manipulation as shared objects. Therefore, synchronizing media and the actions upon them in both a timely and causal manner are necessary to maintain a semantically coherent workspace. This paper discusses these issues and introduces a framework based on Virtual Enablers and Virtual Barriers designed to support the diverse range of synchronization requirements within collaborative multimedia systems. Its associated architecture is described and the model's application to the field of telelearning is illustrated.

关键词： Collaboration Multimedia systems Collaborative work Teleconferencing Application software Multimedia computing Distributed computing Multimedia communication Virtual environment computer architecture

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Noisy autoregressive system identification by the ramp cepstrum of one-sided autocorrelation function

Noisy autoregressive system identification by the ramp cepst...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： S.A. Fattah W.-P. Zhu A.O. Ahmad Centre for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

The paper presents a new approach for the identification of minimum-phase autoregressive (AR) systems in the presence of heavy noise. A damped cosine model for the ramp cepstrum of the one-sided autocorrelation function of a noise-free AR signal is proposed to estimate the AR parameters. The AR parameters are obtained directly from the estimated damped cosine model parameters. The proposed method overcomes the failure of conventional cepstrum and correlation based techniques in noisy AR system identification at a very low signal-to-noise ratio (SNR). computer simulations are carried out based on. both synthetic AR systems and natural speech signals, showing superior identification results even at an SNR of -5 dB for which most of the existing methods would fail.

关键词： System identification Cepstrum Autocorrelation Parameter estimation Signal to noise ratio Working environment noise Biomedical signal processing Signal processing Speech processing Equations

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Dual hop MIMO OSTBC communication over Rayleigh-Rician channel

Dual hop MIMO OSTBC communication over Rayleigh-Rician chann...

引用

IEEE Vehicular Technology Conference

作者： Jayasinghe, L.K. Saliya Rajatheva, Nandana Dharmawansa, Prathapasinghe Latva-Aho, M. Centre for Wireless Communications University of Oulu P.O. Box 4500 FIN-90014 Oulu Finland Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong

ISBN: (纸本)9781424483310

This paper investigates orthogonal space-time block coded transmission for a multiple-input multiple-output (MIMO) channel with non-coherent amplify-and-forward relaying in a situation where the source-relay and relay-destination channels undergo Rayleigh and Rician fading respectively. Fading coefficients of the Rician channel are independent but not necessarily identically distributed. We derive exact expressions for the moment generating function, first and second moments of the instantaneous signal-to-noise ratio at the destination to statistically characterize the system behavior. We then analyze the system performance by deriving new analytical expressions for the bit error rate and amount of fading. These performance metrics reveal that strong line of sight components between relay-destination link always limit the performance promised by MIMO scattering environment when both nodes have multiple antennas. © 2011 IEEE.

关键词： Signal to noise ratio

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Joint bit-allocation for MPEG encoding of multiple video sequences with minimum quality-variation

Joint bit-allocation for MPEG encoding of multiple video seq...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： H. Sorial W.E. Lynch A. Vincent Centre for Signal Processing and Communications Department of Electrical & Computer Engineering Concordia University Montreal QUE Canada

This paper addresses the problem of multi-program video transmission over a single communication channel. We present a joint bit-allocation for MPEG encoding of multiple video sequences with a minimum quality-variation. The proposed method uses a picture-complexity measure based on the actual coding distortion in encoded frames, then allocates accordingly the available bits to explicitly reduce the variation in quality between the sequences. We compare the performance of the proposed method to independent encoding of the sequences at constant bit rates and to encoding with a joint bit-allocation scheme that uses a TM5-like picture-complexity measure. Results show that the proposed bit-allocation method is superior in terms of minimizing the quality variation between the video sequences and within the individual sequences. The method also provides better minimum picture quality than the other encoding schemes mentioned above. Applications of the joint bit-allocation method include multi-program transmission such as video on demand (VOD) services and digital TV broadcasting.

关键词： Encoding Video sequences Telecommunication control Communication channels Bit rate Video on demand Layout Bandwidth Streaming media Equations

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