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Broadcasting, IEEE Transactions on

Issue 2 • Date Jun 2000

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Displaying Results 1 - 10 of 10
  • A fuzzy search algorithm for the estimation of motion vectors

    Publication Year: 2000 , Page(s): 121 - 127
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (224 KB)  

    The block motion estimation/compensation techniques are efficient methods to reduce the required bitrate by eliminating temporal redundancy of the image sequence. In this paper, an efficient search algorithm for block motion estimation is presented. By using the inter-block and inter-frame fuzzy prediction, the algorithm can determine the motion vectors of image blocks quickly and correctly. According to the experimental results, our algorithm performs better than other search algorithms, such as TSS, NTSS, FSS, BBGDS, SES, PSA, GPS, and FPS in terms of seven different measures View full abstract»

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  • Measuring the DTV signal

    Publication Year: 2000 , Page(s): 114 - 120
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (280 KB)  

    Since the adoption of the FCC mask for out-of-band emissions in its Sixth Recon Order, broadcasters and equipment manufacturers alike have been struggling to understand the implications not only from a performance standpoint, but also from a compliance measurement standpoint. The quality of the in-band signal is insured by measurements that bear little resemblance to what is presently done for analog television. The physical limitations of standard test equipment and the inaccuracies of broadband samples from high power RF systems make demonstrating out of band compliance very difficult. This paper explains methods of measurement used by Thomcast Communications to verify compliance of a transmission system from “DC to light.” The paper gives an explanation of the technical limitations of existing equipment and methods used by broadcasters in NTSC transmission. It also offers real solutions to the measurement difficulties View full abstract»

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  • Mobile radio propagation path loss studies at VHF/UHF bands in Southern India

    Publication Year: 2000 , Page(s): 158 - 164
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (156 KB)  

    Field strength measurements at 200, 400 and 450 MHz (VHF/UHF band) were conducted with the field strength meter placed on board a vehicle in Southern India. Observed field strength values were converted into path losses and are compared with different path loss prediction methods like Hata (1980), Egli (1957), Blomquist-Ladell (1974), COST 231 Walfisch-Ikegami (Doble 1996), Walfisch-Bertoni (1988) and ITU-R. These path loss studies are carried out in urban, suburban and open areas in this region. The results showed that Hata's method gave better agreement with observed values in urban, suburban and open regions; the COST 231 Walfisch-Ikegami model is also in good agreement with the observed values in urban and suburban regions, the Egli and Blomquist-Ladell methods showed moderate agreement in open regions only. The agreement of the Walfisch-Bertoni and ITU-R methods with observed values is not good View full abstract»

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  • COMETS 21-GHz advanced satellite broadcasting experiments-evaluation of trellis-coded 8-PSK performance

    Publication Year: 2000 , Page(s): 144 - 151
    Cited by:  Papers (3)  |  Patents (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (204 KB)  

    An advanced satellite broadcasting system using 21 GHz has been studied by using the high-power (200 W) and wideband (120 MHz) transponders on the Communication and Broadcasting Engineering Test Satellite (COMETS), which was launched 21 February 1998. A highly effective trellis-coded eight-phase-shift-keying (TC8PSK) modem was developed for the COMETS satellite broadcasting experiments, and this paper describes the degradation in the bit error performance of the TC8PSK modem due to the nonlinear amplification (AM/AM distortion and AM/PM conversion effects), group-delay distortion, and amplitude-frequency characteristics of the satellite transponder. The results of the COMETS experiments and computer simulations indicate that the performance degradation is due primarily to the nonlinear distortion and the amplitude-frequency characteristics of the traveling wave tube amplifiers in the transponder View full abstract»

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  • Study of a frequency diversity system for indoor digital TV

    Publication Year: 2000 , Page(s): 165 - 170
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (200 KB)  

    A wide band measurement campaign has been carried out in the DVB-T frequency band. The coherence bandwidth has been measured and its variation with the antennas separation is studied. Also, the relation between the coherence bandwidth and the RMS delay spread is investigated View full abstract»

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  • An adaptive pre-distorter for the compensation of HPA nonlinearity

    Publication Year: 2000 , Page(s): 152 - 157
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (204 KB)  

    A high power amplifier (HPA) is used for the amplification of transmitting communication signals. However, it produces distortions by creating AM/AM and AM/PM modulations in the transmitting signal, Accordingly, this nonlinearity results in bandwidth expansion and nonlinear distortion in the in-band signal. This paper proposes an algorithm for the operation of a pre-distorter, which is composed of a look-up table (LUT), that can compensate for the distortion produced by an HPA. For the fast initialization of the LUT, an estimation algorithm is also proposed for the HPA characteristics. Furthermore, an adaptive algorithm based on the minimization of the mean square error is proposed to compensate for the time-varying property of an HPA. The performance of the proposed algorithm is analyzed by applying the algorithm to an 8-level vestigial sideband (VSB) modulation to be used in the ATSC terrestrial digital TV system View full abstract»

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  • Channel estimation and equalization for M-QAM transmission with a hidden pilot sequence

    Publication Year: 2000 , Page(s): 170 - 176
    Cited by:  Papers (50)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (244 KB)  

    Blind equalization techniques are useful to counteract multipath effects in radio local loop (RLL) and in general for wireless point to multipoint transmissions. One of the main drawbacks of blind equalization is the slow convergence time of the equalizer. Another major problem of blind equalization is the possible convergence toward wrong solutions. When these two main disadvantages cannot be tolerated it is necessary to adopt trained channel estimation and/or equalization techniques to counteract multipath. The training sequence is usually time division multiplexed with the informative sequence. This solution reduces the bandwidth efficiency and can be unusable when too frequent updating of the communications parameters need to be performed in the receiver. It is shown that bandwidth efficiency can be preserved at the expense of an increase in the transmitted power. The additional transmitted power is used to send a known pilot sequence hidden into the informative sequence. The hidden sequence is superimposed onto the symbols to be transmitted before waveform modulation. Thus each pilot symbol has the same period of the informative symbol so that no bandwidth spreading is necessary. High spectral efficiency M-QAM modulation is considered but the technique can be easily extended to any type of digital modulation format. We analyze the problems of channel estimation and of equalization based on the hidden pilot sequence. To prove the effectiveness of the proposed technique simulation results are provided. It is observed that in the case of equalization a pilot recovery subsystem should be used before using the pilot to train the equalizer View full abstract»

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  • Comparison of terrestrial DTV transmission systems: the ATSC 8-VSB, the DVB-T COFDM, and the ISDB-T BST-OFDM

    Publication Year: 2000 , Page(s): 101 - 113
    Cited by:  Papers (54)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (188 KB)  

    This paper compares the performances of the ATSC 8-VSB, the DVB-T COFDM, and the ISDB-T BST-OFDM digital television terrestrial transmission systems under different impairments and operating conditions. First, a general system level description is presented. It is followed by comparisons based on laboratory test results and theoretical analyzes. The differences in the system threshold definitions are discussed. In addition, a performance and implementation analysis is also presented for the three transmission systems under different network infrastructures, whenever possible, the impact on the broadcasters or consumers is discussed. Possible performance improvements are also identified View full abstract»

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  • On the use of frame-based slice size for the robust transmission of MPEG video over ATM networks

    Publication Year: 2000 , Page(s): 134 - 143
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (872 KB)  

    We study the performance requirements for the transport of MPEG video streams over ATM networks. A control scheme is introduced to limit the propagation of impairments through MPEG-based video sequences as a result of cell losses. The scheme assigns different slice sizes to the video frames based on their type and order of appearance within the group of pictures. The main aim of the proposed scheme is to improve the robustness of the video delivery process at a minimum cost. Our results demonstrate the effectiveness of this scheme in reducing the propagation of impairments due to the loss of information during the transmission of MPEG video streams over ATM networks View full abstract»

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  • An adaptive two-dimensional channel estimator for wireless OFDM with application to mobile DVB-T

    Publication Year: 2000 , Page(s): 128 - 133
    Cited by:  Papers (52)  |  Patents (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (200 KB)  

    An adaptive channel estimator is proposed and investigated to improve the performance of the receiver for pilot aided wireless and mobile OFDM systems. The estimator consists of a two-dimensional Wiener filter which is implemented as a cascade of two one-dimensional filters. We propose an efficient algorithm for adaptation to time varying channels of the second filter. The method is applied to the Terrestrial Digital Video Broadcasting System (DVB-T), which was originally specified for fixed receivers and which is in the process of being extended for mobile reception. The results are shown after inner decoding. Depending on the channel conditions, the signal-to-noise ratio gain can be up to 1.6 dB. The method provides a compatible improvement to DVB-T receivers 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