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Broadcasting, IEEE Transactions on

Issue 2 • Date Jun 1998

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Displaying Results 1 - 12 of 12
  • Performance evaluation of cell discarding mechanisms for the distribution of VBR MPEG-2 video over ATM networks

    Publication Year: 1998 , Page(s): 206 - 215
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (908 KB)  

    ATM networks promise to provide the means to support a wide range of applications exhibiting different traffic characteristics and performance requirements. Video communications have been recognized as one of the most demanding applications to be supported by ATM networks. This is mainly due to the need of transferring large amounts of data and the strict timing requirements characterizing digital video applications. In this paper, simulation experiments are conducted to study the performance of the different cell discarding control mechanisms, in terms of quality of service, when used in an ATM network supporting hierarchical encoded VBR MPEG-2 video distribution. Our results show the effectiveness of the control schemes in reducing the cell loss rates as compared to the system configuration without a cell discarding scheme in place View full abstract»

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  • Performance of an in-band adjacent-channel DAB system for frequency-selective Rayleigh and Ricean slow fading channels under analog FM interference

    Publication Year: 1998 , Page(s): 243 - 249
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (512 KB)  

    In support of the 1995-1997 DAB (digital audio broadcasting) testing conducted by the NRSC (National Radio Systems Committee), an IBAC (in-band adjacent-channel) scheme was developed by AT&T. Although not for use in the United States, bit error rate (BER) system performance under both fading environments and the existing analog FM broadcasting is important to quantify. This is because there may still exist other countries and environments where an IBAC approach to DAB is feasible and economical. Given this situation, an IBAC simulation model has been developed to allow for a performance analysis study within the mobile reception environment, which is dominated by Rayleigh and Ricean fading statistics. This paper presents the simulation results for coherent quadrature phase-shift-keying (QPSK) with nonlinear equalization for both frequency-selective Rayleigh and Ricean slow fading channel environments, along with co-channel, 1st-adjacent and 2nd-adjacent analog FM interference. The results indicate that for a country where spectrum availability dictates an IBAC solution, this approach may perform well under various fading and interference environments View full abstract»

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  • Adaptive fast data broadcasting scheme for video-on-demand service

    Publication Year: 1998 , Page(s): 182 - 185
    Cited by:  Papers (8)  |  Patents (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (372 KB)  

    As we support video-on-demand (VOD) service with batching schemes, the bandwidth requirement will be very large for a popular movie. For a hot video, fast data broadcasting scheme substantially reduce the bandwidth requirements as compared with batching schemes. However, the fast data broadcasting scheme needs to predict which movie is hot. If the prediction is not accurate, the allocated bandwidth will be wasted. This paper presents a new data broadcasting scheme for VOD service. For a movie, as it is popular, the new scheme will work like the fast data broadcasting scheme to save the communication bandwidth. If there is no request for the movie, the new scheme will not allocate bandwidth for the movie. Therefore, the bandwidth allocation for a movie is always efficient whether or not the movie is popular View full abstract»

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  • The utilization of the redundancy bandwidth of upstream channel in HFC network

    Publication Year: 1998 , Page(s): 216 - 225
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (540 KB)  

    In an HFC network, the upstream bandwidth, which subscribers use to send a variety of traffic, is entirely allocated by the headend. Some of the traffic classes (such as voice) only use a part of their allocated bandwidth, thus there is redundant bandwidth. This paper describes a method that uses the redundant bandwidth to transmit other traffic classes so as to increase the utilization of the upstream bandwidth View full abstract»

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  • Diurnal distribution of rain attenuation in communication and broadcasting satellite systems at 11.6 GHz in Italy

    Publication Year: 1998 , Page(s): 250 - 258
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (620 KB)  

    The paper presents long term probability distributions of rain attenuation exceeded in 0.5-h, 1-h, 2-h, 4-h, 8-h, 12-h and 24-h contiguous periods of the day, at 11.6 GHz, circular polarization, in satellite radio links, at two sites in Italy (Gera Lario and Fucino). These data can be useful to match the system design to the time of the day, which can be affected very differently by rain attenuation. The results can be scaled to higher frequencies and are directly applicable to actual satellite TV and radio broadcasting, and to telecommunication systems in the 12 GHz band. The data have been obtained by applying the synthetic storm technique (after testing its predictions in the 4-h case against experimental long term results) to a large and statistical reliable set of rain rate time series collected in five years (1978-1982) of continuous observation during the satellite SIRIO experiment, in slant paths of elevation angles 32° and 33°. The number of concurrent rain rate (and rain attenuation) time series considered is 587 for Gera Lario and 562 for Fucino, a very large data bank View full abstract»

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  • A method for modeling array elements when using NEC and MININEC

    Publication Year: 1998 , Page(s): 186 - 193
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (852 KB)  

    This paper distinguishes between the active and passive states of an array element and advances the thesis that models defined in the passive state maintain their validity in the active state. The influence of reactance at the base of an array element is demonstrated and analytical expressions are suggested to aid in quantifying the base reactance. A model architecture is proposed together with methods for determining the model parameters. Examples of both analysis and design are included and the results are compared to measured data View full abstract»

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  • Adaptive equalisation of multipath interference for mobile video signal reception

    Publication Year: 1998 , Page(s): 172 - 181
    Cited by:  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (764 KB)  

    By using multiantenna diversity system to combat fading for mobile reception of video signals a nearly omnidirectional antenna pattern diagram can be achieved. However ghosts, especially fluttering ghosts, mainly caused by the fast rotating echo phases and RF signal level fluctuation, still affect the picture quality. It is shown that a single ghost cancelling reference (GCR)-signal is not sufficient for fluttering ghost suppression. A blind TV signal equalisation algorithm, which is based on image processing techniques, is developed to remove the interference of echoes with rapidly changing phases. A simplified version of this algorithm is included to reduce the computational load and allow suitable IC integration View full abstract»

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  • Field trials of an MPEG2 distributed single frequency network

    Publication Year: 1998 , Page(s): 194 - 205
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (624 KB)  

    The digital terrestrial television standard approved by the European Telecommunications Standards Institute (ETSI) is based upon the work of the Digital Video Broadcasting group (DVB). This standard using coded orthogonal frequency division multiplexing (COFDM) facilitates the establishment of single frequency networks (SFN). The first MPEG2 distributed SFN was established by RTE and other partners of the European Commission sponsored project VALIDATE (Verification and Launch of Integrated Digital Advanced Television in Europe) in Ireland. This paper describes the network established and details some of the measurements performed. Two co-channel UHF transmitters were synchronised using the MPEG2 megaframe identification packet (MIP). A 155 Mbit/sec STM-1 microwave link system was used for signal distribution View full abstract»

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  • Joint video coding of MPEG-2 video programs for digital broadcasting services

    Publication Year: 1998 , Page(s): 153 - 164
    Cited by:  Patents (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1124 KB)  

    In digital broadcasting services such as digital satellite TV, cable TV, and digital terrestrial TV, several video programs are compressed by MPEG-2 and then simultaneously transmitted over a conventional CBR (constant bit rate) broadcasting channel. In this environment, the picture quality of the aggregated video programs should be kept as equal as possible to provide fair video services for all the viewers. We propose a joint video coding scheme for ensuring that the picture quality of all the programs are nearly the same. This objective is achieved by simultaneously controlling the video encoders to generate the VBR (variable bit rate) compressed video streams. This paper contributes in two ways. First, we propose a rate-distortion estimation method for MPEG-2 video, which enables us to predict the amount of bits and the distortion generated from an encoded picture at a given quantization step size and vice versa. The most attractive features of the proposed estimation method are its accuracy and a computational complexity low enough to be applied to real-time video coding applications. Second, this paper presents an efficient and accurate joint video coding scheme using the rate-distortion estimation results. The experimental results show that our coding scheme gives a higher and more stable picture quality and a more efficient channel utilization than an independent coding scheme that encodes each program independently View full abstract»

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  • Broadcast analysis and prediction in the HF band

    Publication Year: 1998 , Page(s): 226 - 232
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (580 KB)  

    A comparative study of the commonly used methods for the prediction of the coverage area due to a transmitter operating in the HF band is presented. Those statistical model based tools are: ITU Rec. 533, Ionospheric Communication Analysis and Prediction Program; IONCAP, Voice of America's VOACAP and Ionospheric Communication Enhanced Profile Analysis and Circuit Prediction Program; ICEPAC. The received signal due to a typical transmitter located at Cricklade, England, operating around 7.9-19.1 MHz (HF band I) is computed as a function of frequency, time and the sunspot number. The ray tracing method calculates the virtual height, the calculated results are compared with the experimental data and the discrepancies are examined View full abstract»

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  • MPEG-2 spatial scalable coding and transport stream error concealment for satellite TV broadcasting using Ka-band

    Publication Year: 1998 , Page(s): 233 - 242
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1132 KB)  

    In this paper, an effective MPEG-2 spatial scalable video codec is designed, and an error concealment technique for the associated transport stream is proposed. The spatial scalability can provide robust error resilience for Ka-band rain attenuation, as well as the co-existence of HDTV and SDTV systems. In MPEG-2, the spatial scalable encoder combines both spatial and temporal predictions. This paper proposes a near optimal spatial-temporal weighting analyzer to properly assign weights. Simulation shows that the proposed spatial scalable codec structure outperforms the performance of the other MPEG-2 codecs for TV broadcasting in Ka-band using satellites. We also propose a suitable error protection and concealment method for the MPEG-2 transport stream. With the combination of scalable coding and error protection systems, the proposed system will achieve high link availability View full abstract»

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  • Performance evaluation of COFDM for digital audio broadcasting. II. Effects of HPA nonlinearities

    Publication Year: 1998 , Page(s): 165 - 171
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (716 KB)  

    For pt. I see ibid. vol.43, no.1, p.64-75, 1997. The effects of the high power amplifier (HPA) nonlinearities on the performance of the Eureka 147 DAB system are studied by computer simulation. The performance is determined for three types of HPA: a travelling wave tube amplifier (TWTA), a solid state power amplifier (SSPA) and a perfectly linearized amplifier (PLA). Two related performance criteria are used: (a) the degradation, resulting from HPA nonlinearities, in the Eb /N0 ratio required at the receiver to maintain a bit error rate of 10-4 and (b) the total power degradation. These degradations are measured as a function of the HPA output backoff (OBO). The effect, on the Eb/N0 degradation, of linearizing only the phase or only the amplitude transfer characteristic of the TWTA and the SSPA is also assessed. Correcting the phase distortion alone in both HPAs is found to reduce the Eb/N0 degradation by less than 0.5 dB. Linearization of the amplitude characteristic alone, on the other hand, can reduce the Eb/N0 degradation by several dBs at small OBO values (<2 dB). The optimum output backoff which minimizes the total power degradation is between 2 and 3 dB for both the TWTA and the SSPA in a terrestrial mobile channel and between 1 and 2 dB in an AWGN channel. The optimum output backoff for the PLA is 2 dB in the terrestrial channel and between 1 and 2 dB in the AWGN channel. At the optimal operation point, the power saved by linearizing the amplitude and phase characteristics of the TWTA or the SSPA is about 0.6 dB for the terrestrial mobile channel and 0.4 dB for the AWGN channel View full abstract»

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

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Editor-in-Chief
Yiyan Wu
Communications Research Ctr Canada