Hierarchical quadrature frequency multiplex signal format and ap

Details Hierarchical quadrature frequency multiplex signal format and ap Hierarchical quadrature frequency multiplex signal format and ap

1995-03-15

1997-07-08

Ton, Dang

Multiplex communications

Generalized orthogonal or special mathematical techniques

Quadrature carriers

375261, H04J 1500

Patent

active

056469357

ABSTRACT:
A hierarchical quadrature frequency multiplex signal transmission apparatus that produces a plurality of modulated signals in which multiple layers of hierarchical information data are associated with a plurality of hierarchically graded modulation forms. The apparatus also interleaves symbols within a frame of the hierarchical information data in both a time axis and a frequency axis. In addition, the apparatus may differentially encode one of the hierarchically graded modulation forms. Further, the apparatus performs an inverse Fourier transform on the symbols, by associating each of the plurality of hierarchically graded modulation forms with a corresponding predetermined carrier. Also disclosed is an apparatus for receiving the hierarchical quadrature frequency multiplex signal and the format of the hierarchical quadrature frequency multiplex signal.

REFERENCES:
patent: 5428610 (1995-06-01), Davis
Le Floch et al., "Digital Sound Broadcasting to Mobile Receivers", IEEE Transactions on Consumer Electronics, vol. 35, No. 3, pp. 493-503, Aug. 1989.
Monnier et al., "Digital Television Broadcasting With High Spectral Efficiency", IBC Proceedings, No. 358, pp. 380-384, Jul. 1992.
Tsuzuku et al., "A Study of the Modulation and the Transmission Capacity for the Digital Terrestrial TV Broadcasting", ITE Technical Report, vol. 17, No. 54, pp. 7-12.

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