MODULATION AND CODING TECHNIQUES FOR HIGH CAPACITY COAXIAL CABLE AND SCM FIBER DIGITAL TV-HDTV DISTRIBUTION

New emerging digital modulation­ demodulation (modem) and coding techniques suitable for spectrally and power efficient digital TV and IIDTV distribution systems over coaxial cable and subcarrier multiplexed (SCM) fiber optics systems are described. Efficient and robust modulators/demodulators (modems) combined with low redundancy forward error correction (FEC) - integrated circuits attain a spectral efficiency in the 2 b/s/Hz to 7 b/s/Hz range and a bit error rate (BER) in the lQ-7 to lQ-10 range. Recently developed VLSI­ ASIC chips, having a universal QPSK-QAM­ QPRS modem architecture combined with FEC­ chips, operating up to 100 Mb/s, with a 3% to 10% redundancy will enable the transmission of 30 Mb/s rate (or even higher bit rate) digitized TV signals in one conventional analog TV band. Requirements for FDM shared analog and digitized TV distribution systems are highlighted. The performance of a new class of QPRS filtered modems invented by the author is compared to conventional QPRS and QAM-8-PSK cable systems. The performance advantages of our new class of "above Nyquist rate" modems and of an operational SQPRS (staggered) QPRS system developed by Digital Radio Laboratories are highlighted.

[1]  D. C. Bunday.  Digital Communications: Satellite/Earth Station Engineering , 1983 .

[2]  W. I. Way,et al.  Fiber-optic transmissions of microwave 8-phase-PSK and 16-ary quadrature-amplitude-modulated signals at the 1.3- mu m wavelength region , 1988 .

[3]  Kamilo Feher.  1024-QAM and 256-QAM Coded Modems for Microwave and Cable System Applications , 1987, IEEE J. Sel. Areas Commun..

[4]  Iwao Sasase,et al.  QAM and QPRS digital broadband cable systems , 1989 .

[5]  Kuang-Tsan Wu,et al.  Class-IV PRS above the Nyquist rate , 1988 .

[6]  G. A. Reitmeier,et al.  Source coding, channel coding and modulation techniques used in the ADTV system , 1991 .

[7]  Kamilo Feher.  Advanced Digital Communications: Systems and Signal Processing Techniques , 1986 .

[8]  K. Feher,et al.  Effect of HPA non-linearities on crosstalk and performance of digital radio systems , 1988 .

[9]  Kamilo Feher,et al.  Digital Communications: Microwave Applications , 1981 .

[10]  W. I. Way,et al.  Subcarrier multiplexed lightwave system design considerations for subscriber loop applications , 1989 .

[11]  J. A. Krauss.  Source coding, channel coding and modulation techniques used in the DigiCipher system , 1991 .

[12]  Kamilo Feher.  Digital Communications: Satellite/Earth Station Engineering , 1982 .

[13]  P. Fockens,et al.  Source coding, channel coding and modulation techniques used in the digital spectrum-compatible HDTV system , 1991 .

[14]  R.C. Menendez,et al.  Evolutionary architectures and techniques for video distribution on fiber , 1989, IEEE Communications Magazine.