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Broadcasting, IEEE Transactions on

Issue 4 • Date Dec 1992

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Displaying Results 1 - 9 of 9
  • Estimating symbol error rate vs. carrier to noise in IQ modulated systems based on digitization of constellation and statistical models

    Page(s): 229 - 236
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    Methods used to characterize the degradation of symbol error rate (SER) vs. carrier-to-noise ratio (C/N) performance of several different components of systems that broadcast digital video signals are presented. The techniques are based on repetitively sampling and then digitizing the IQ constellation at baseband. Mathematically different levels of noise calculated relative to the carrier are added to the digitized constellation. Examination of the resulting distributions of noise versus error thresholds allows the estimation of SER vs. C/N in the absence of any error correction in the receiver. The effects of IF bandwidth and transmit and receive filters are also taken into account. The estimated SER vs. C/N can be plotted and compared to the theoretical SER vs. C/N for the modulation format, IF bandwidth, and transmit and receive filters in the system under test View full abstract»

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  • Technical considerations of channel 6/FM combining systems

    Page(s): 237 - 242
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    Currently there are approximately 58 commercial channel 6 facilities in the United States. Noncommercial FM stations must protect these facilities from interference by using only antennas. It is argued that this could be avoided by collocating the FM and TV facilities thus broadcasting from the same antenna. TV facilities could generate significant capital by allowing FM broadcasters, commercial and noncommercial, to multiplex onto their current antenna system View full abstract»

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  • Cascaded-loop MW/SW receiving antenna rejects sky-wave interference and enables diversity reception at SW

    Page(s): 243 - 251
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    It is shown that cascaded loop antenna (CLA) technology can be used to improve the quality of reception of HF broadcasts in two ways. The first is interference reduction by means of the stable null response, which is equally effective with either sky wave or ground waves. This requires one receiver and one CLA. Addition of a second CLA and receiver makes possible reception with binaural diversity. Using this method, broadcasts can be made clearer even when receivers of low cost and modest performance are used View full abstract»

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  • A 70 mile long-distance experimental broadcast of digital spectrum compatible high definition television

    Page(s): 202 - 218
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    An experiment in which digital high definition television broadcasts originating at the facilities of UHF television station WMVT, channel 36, in Milwaukee, Wisconsin, were received at the facilities of Zenith Electronics Corporation in Glenview, Illinois, approximately 70 miles distant, is reported. The broadcasts used the Zenith/AT&T Digital Spectrum Compatible High Definition Television System proposed to the Federal Communications Commission Advisory Committee on Advanced Television. The digital signal was received at the 70 miles distance except for very infrequent intervals of fading in early experimentation. A mobile test vehicle 40 to 50 miles distant received the digital signal without error. Cochannel interference from a low-power television station was effectively suppressed View full abstract»

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  • A characterization of the multipath in the HDTV channel

    Page(s): 252 - 255
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    A statistical model for analyzing measured impulse responses of channels that may be used in over-the-air HDTV transmissions is discussed. Measurements made on propagation paths approximating those to be expected in the over-the-air HDTV service show that multipath is nearly always present. Under most conditions, however, the total strength in the extra signals is small and a good digital system might well be blind to them View full abstract»

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  • Ghost canceling: a new standard for NTSC broadcast television

    Page(s): 224 - 228
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    A recent standardization program has now been successfully concluded and resulted in adoption of a single voluntary standard for ghost canceling that has wide support from all facets of the television industry. The standardization process and the technical details of the standard are described View full abstract»

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  • Field testing DigiCipher HDTV in Los Angeles

    Page(s): 219 - 223
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    Test results for DigiCipher, the first all-digital HDTV system developed by the American Television Alliance, showed that the DigiCipher system performed very well in all areas, including the laboratory testing of terrestrial transmissions. Recently, field testing of the DigiCipher HDTV system in the Los Angeles, California, area was undertaken to verify the performance of the system in a real world environment, and to help anticipate how DigiCipher will perform in US FCC field testing. The results indicated that reliable reception can be achieved at distances as far as 42 miles from the transmitter, with only 137 W of average power in the presence of strong adjacent channel and cochannel interference View full abstract»

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  • Simulation of multipath fading/ghosting for analog and digital television transmission in broadcast channels

    Page(s): 256 - 262
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    An approach to the simulation of many of the channel impairments attributed to multipath fading and ghosting of a television signal is discussed. The use of the Hewlett Packard 11759D Dynamic Ghosting Simulator, which is capable of generating fading models ranging from static transmission conditions to dynamic cases of airplane flutter, tower sway, and reception by a mobile receiver in the simulation is described. All of these conditions can be used to subject future receivers, equalizers, and ghost cancellation circuitries to field-testing within the laboratory environment View full abstract»

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  • Measuring peak and average power of digitally modulated advanced television systems

    Page(s): 197 - 201
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    The author reviews why it is that the peak power of the NTSC visual signal is measured, noting that its average power varies inversely with scene brightness. The average power of a digital TV signal is independent of scene content, motion, and other variables and is, therefore, the parameter to be measured and used to compute interference, coverage, and the utility cost to provide that coverage. Transient peak power varies with the data stream, and for this reason it is a statistical quantity. A method to determine the transient peak power is described. Thermocouple power sensors and the limitations of square law power sensors are also discussed 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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Editor-in-Chief
Yiyan Wu
Communications Research Ctr Canada