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Broadcasting, IEEE Transactions on

Issue 1 • Date March 2002

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Displaying Results 1 - 11 of 11
  • Comments on spectral efficiency of VMSK

    Publication Year: 2002 , Page(s): 61 - 62
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (170 KB)  

    This article demonstrates that no ultra narrow band modulation (UNBM) method, which includes very minimum shift keying (VMSK) and VPSK, can have substantially greater efficiency than conventional methods, such as quadrature amplitude modulation (QAM), in transmission in the same frequency band. View full abstract»

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  • Residue number system-based multicarrier CDMA system for high-speed broadband wireless access

    Publication Year: 2002 , Page(s): 46 - 52
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (335 KB)  

    This correspondence is concerned with a new method to enhance the bandwidth efficiency of a multicarrier CDMA system by using a residue number based representation for information symbols. The residues are mapped into a set of orthogonal sequences and are transmitted in parallel. A new modulation scheme is proposed to increase the data rate further by combining residue number representation, PSK/QAM modulation, orthogonal spreading and multicarrier modulation. The performance of the proposed system is evaluated in a frequency selective Rayleigh fading channel via extensive simulations. The present correspondence discusses the design issues associated with the system together with the performance results View full abstract»

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  • MAC units for matched filters in DS-CDMA systems

    Publication Year: 2002 , Page(s): 52 - 57
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (310 KB)  

    High data rates in wireless radio environments are becoming common. Current system designs are inadequate to meet the speed requirements that are anticipated in newer services. The computational complexity in the subsystems of wireless radio increases in direct proportion to the data rate. In this correspondence, we propose alternative multiply accumulate (MAC) units for the pulse shaping filters that use a new representation for their coefficients. Consequently, these new structures are fast, efficient and dissipate less power. The filters proposed take into account constraints, such as, intersymbol interference, response characteristics etc. in their design methodology View full abstract»

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  • An analysis of DTV propagation into and within a room in a domestic environment

    Publication Year: 2002 , Page(s): 1 - 9
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (459 KB)  

    A window in a room within a domestic environment in a structure with aluminum siding is analyzed with respect to its radiating properties. The window is modeled as a rectangular aperture, which diffracts the distant horizontally polarized signal from a DTV transmitting antenna into the environment of the room. The diffraction signal, also horizontally-polarized, is combined with the distant signal, which penetrates the aluminum siding at some loss, and thereby a field distribution within the room is created. The window-diffracted signal is almost entirely a near field (Fresnel zone) within the room while the distant field is a far field (Fraunhofer zone) within the room. Various locations within the room are examined with respect to echoes, with and without scattering (human) bodies. A receiving antenna is positioned at the locations examined View full abstract»

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  • Client buffering techniques for scalable video broadcasting over broadband networks with low user delay

    Publication Year: 2002 , Page(s): 19 - 26
    Cited by:  Papers (15)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (342 KB)  

    In traditional near-VOD (NVOD), the number of streams required is high if the user delay goal is low (say, 2 minutes). We study the use of client buffering to reduce such bandwidth requirement. We first study a scheme based on a streaming approach termed "join-and-stream" (JAS), which broadcasts a movie in a staggered manner and uses short unicast streams to recover the time difference between the broadcast point and the arrival time. We show that such a technique is effective for movies with intermediate arrival rate. We then propose a broadcasting scheme for popular movies termed "stream-bundling." The scheme groups (i.e., "bundles") the server streams into channels of incrementally increasing bandwidth. Such high-speed bundled channels are used to deliver the beginning portion of the videos to the clients, so that the clients can merge with an on-going broadcast stream quickly. By comparing with other previously proposed broadcasting schemes (such as pyramid broadcasting, skyscraper broadcasting and harmonic broadcasting), stream-bundling is shown to achieve similar level of performance with much lower complexity (without many channels to manage and to hop). Using our two schemes, the bandwidth requirement of a system can be reduced significantly (by more than 50% in our examples) as compared with the traditional NVOD, with the cost of only a little client buffering (⩽20% of the movie length) View full abstract»

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  • Design of a 3780-point IFFT processor for TDS-OFDM

    Publication Year: 2002 , Page(s): 57 - 61
    Cited by:  Papers (35)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (263 KB)  

    This correspondence presents a design of 3780-point IFFT processor for TDS-OFDM terrestrial DTV transmitter using FPGA. It demonstrates the algorithm design and error analysis of the processor, which can achieve a throughput of 7.56M complex IFFT operations per second. This design meets the signal-to-quantization noise ratio requirement of the TDS-OFDM system. It consists of two FPGA and one dual-port RAM. The data stream pipeline algorithm is implemented View full abstract»

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  • Analysis of ATSC field test results in Taiwan

    Publication Year: 2002 , Page(s): 38 - 43
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (270 KB)  

    Field tests of the transmission performance of the ATSC DTV system have been conducted in Taiwan. The test results as well as comparisons against the NTSC system performance are reported and analyzed. From the measured results the reception characteristics of the DTV can be deduced and can provide guidelines for television stations to design the transmission system, schedule equipment deployment, plan service coverage areas, and improve the reception quality of the digital signal View full abstract»

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  • Efficient traffic prediction scheme for real-time VBR MPEG video transmission over high-speed networks

    Publication Year: 2002 , Page(s): 10 - 18
    Cited by:  Papers (22)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (353 KB)  

    The efficient transportation of real-time variable bit rate (VBR) video traffic in high-speed networks is currently an active area of research. The capability to predict VBR video traffic can significantly improve the effectiveness of numerous management tasks, including dynamic bandwidth allocation and congestion control. This paper proposes an adaptive traffic prediction method for VBR MPEG videos, a major multimedia application. Rapid traffic variations due to scene changes are analyzed, then a prediction scheme using the identification of scene changes related to I and P frames is presented. For predicting multiplexed MPEG traffic, a prediction interval is derived that represents a highly correlated traffic sequence. In addition, to reduce the prediction error, a less fluctuating signal instead of the original multiplexed traffic is used as the input for the predictor. Simulation results show that the proposed method is able to predict the original traffic more accurately than the conventional LMS method View full abstract»

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  • Operational experience of a new HF tropical band broadcasting system

    Publication Year: 2002 , Page(s): 35 - 38
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (185 KB)  

    The replacement of a tropical band broadcast system for the nation of Vanuatu with antennas designed for frequency changes responding to propagation changes has introduced new challenges in managing the service. Operational experience has highlighted some aspects needing regular maintenance, but much of the equipment has been trouble free. Practical limitations in using the system are discussed View full abstract»

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  • New hybrid genetic algorithms for the frequency assignment problem

    Publication Year: 2002 , Page(s): 27 - 34
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (347 KB)  

    This paper presents a new hybrid genetic algorithm used to solve a frequency assignment problem. The hybrid genetic algorithm presented uses two original mutation and two crossover operators. Theses operators use specialized information to enhance the quality of the solutions. The results obtained by our algorithm are better than the best known results obtained by other methods like tabu search and hybrid genetic algorithm. Our results are validated in the field of radio broadcasting and compared to the best existing solutions in this domain View full abstract»

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  • A fast full search motion estimation algorithm using sequential rejection of candidates from hierarchical decision structure

    Publication Year: 2002 , Page(s): 43 - 46
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (226 KB)  

    We propose a new as well as fast full search (FS) motion estimation algorithm for video coding. The computational reduction comes from sequential rejection of impossible candidates with derived formula and subblock norms. Our algorithm reduces more the computations than the FS motion estimation algorithms previously developed View full abstract»

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Aims & Scope

IEEE Transactions on Broadcasting covers the field of broadcast technology, including the production, distribution, transmission, and propagation aspects of broadcasting.

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Meet Our Editors

Editor-in-Chief
Yiyan Wu
Communications Research Ctr Canada