Hierarchical TV Transmission by Spread—Spectrum Multiplexing

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Publisher: SMPTE — White Plains, NY
Doc Type: Conference Paper
Content Type: Original Research
Volume: 1994, No. 30, pp. 146–156
Abstract: A potential drawback of digital transmission is that slight corruption of the digital signal due to poor reception can result in serious subjective degradation of the decoded signal. This problem is avoided in hierarchical digital TV transmission which uses broadened power spectra to achieve a dispersive threshold and reduce the effects of digital corruption. We have constructed a prototype adaptive weighted code division multiplexing (AW–CDM) model to investigate some features of the technique. In the prototype AW–CDM model, the hierarchical information is divided into 128 orthogonal spread–spectrum binary subchannels, each of which has a different priority and therefore a different threshold. The model's transmission rate is 9.7 Mbps in the 6MHz band. The hierarchical information used is the video and audio signal, which is hierarchically coded into 3 layers: layer III (5.91 Mbps: detail), layer II (1.38 Mbps: medium) and layer I (0.38 Mbps: core). Indoor transmission tests prove layers III, II and I to be retrievable under conditions of carrier–to–noise ratio (CNR)=13.2 dB, 8.3 dB and 0 dB, respectively. The prototype AW–CDM model can, of course, be applied to HDTV transmission by simply changing the binary subchannels into multiple, e.g., quaternary or octonary, subchannels.
Publication Date: 1994-02-01
DOI: 10.5594/M00862
Link: https://doi.org/10.5594/M00862
Author(s): Yasuhiro ItoNHK Science and Technical Research Laboratories Tokyo, Japan
Hiroyuki HamazumiNHK Science and Technical Research Laboratories Tokyo, Japan
Hiroshi MiyazawaNHK Science and Technical Research Laboratories Tokyo, Japan
Copyright: © 1994 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

[1] Salmasi A. Gilhousen K. S. “On the System Design and Aspects of Code Division Multiple Access (CDMA) Applied to Digital Cellular and Personal Communications Network” , Proc. of the 41st IEEE VT Conf., St. Louis, May 19–22, 1991 . EXTERNAL
[2] Schreiber W. F. “Spread–Spectrum Television Broadcasting” , SMPTE J. , pp. 538 – 549 , Aug. 1992 . EXTERNAL

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Yasuhiro Ito, Hiroyuki Hamazumi, and Hiroshi Miyazawa; Hierarchical TV Transmission by Spread—Spectrum Multiplexing, SMPTE Meetings and Conferences ( February 1994); SMPTE, 1994. Available at https://doi.org/10.5594/M00862

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Yasuhiro Ito, Hiroyuki Hamazumi, and Hiroshi Miyazawa; Hierarchical TV Transmission by Spread—Spectrum Multiplexing, SMPTE Meetings and Conferences ( February 1994); SMPTE, 1994. Available at https://doi.org/10.5594/M00862

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<span class="citation">Yasuhiro Ito, Hiroyuki Hamazumi, and Hiroshi Miyazawa; <cite>Hierarchical TV Transmission by Spread—Spectrum Multiplexing</cite>, SMPTE Meetings and Conferences ( February 1994); SMPTE, 1994. Available at <a href="https://doi.org/10.5594/M00862" target="_blank" rel="noopener">https://doi.org/10.5594/M00862</a></span>

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Yasuhiro Ito, Hiroyuki Hamazumi, and Hiroshi Miyazawa; <cite id="bib-10-5594-m00862">Hierarchical TV Transmission by Spread—Spectrum Multiplexing</cite>, SMPTE Meetings and Conferences ( February 1994); SMPTE, 1994
<span class="doi">10.5594/M00862</span>
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