Data transmission method and apparatus for use in low BW:R.sub.s

Details Data transmission method and apparatus for use in low BW:R.sub.s Data transmission method and apparatus for use in low BW:R.sub.s

1995-02-03

1996-07-30

Chin, Stephen

Pulse or digital communications

Transmitters

375350, 375296, 36472401, 327557, H04L 2704, H04L 2712, H04L 2720

Patent

active

055419534

ABSTRACT:
A data transmission scheme for use in a low channel bandwidth-to-modulation symbol rate ratio (BW:R.sub.S) application employing a linear modulator for producing in-phase and quadrature (I and Q) components of a data stream inputted at a predetermined symbol rate. This transmission method allows for the recovery of signals having unfavorable delay spread characteristics. That is, a specialized function is used to process the I and Q components, whose time domain transfer characteristic remains within a predetermined range of a data constellation point for a duration that exceeds 25 percent of a symbol period corresponding to the predetermined symbol rate. The processed response is then band-limited to produce a modulation signal that is usable in the low BW:R.sub.S application.

REFERENCES:
patent: 5363410 (1994-11-01), Hayashi

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