Baseband encoding method and apparatus for increasing the transm

Details Baseband encoding method and apparatus for increasing the transm Baseband encoding method and apparatus for increasing the transm

1994-12-08

1999-01-05

Chung, Phung

Excavating

371 491, 375363, 375264, 375377, 375286, G06F 1100

Patent

active

058569804

ABSTRACT:
An encoder for encoding binary data bits supplied by a data source into pulse amplitude modulated multilevel symbols. The encoder includes a bit stuffer for receiving the data bits from the data source at a first data bit rate, which at most equals a maximum data bit rate. The bit stuffer then adds descriptive bits to the data bits at a descriptive bit rate, which at most equals a maximum descriptive bit rate. The encoder also includes a multilevel pulse amplitude modulator for receiving the data and descriptive bits from the bit stuffer and for converting the data and descriptive bits into pulse amplitude modulated multilevel symbols. When these multilevel PAM symbols are transmitted, they have a spectral energy characteristic which is below a predetermined low level threshold at a predetermined baseband bandwidth frequency. In addition, these multilevel PAM symbols have a symbol rate (i.e., baud rate) which at most equals a maximum baud rate when the first data bit rate equals the maximum data bit rate and the descriptive bit rate equals the maximum descriptive bit rate. In turn, the magnitude of the maximum baud rate equals the magnitude of the baseband bandwidth frequency.

REFERENCES:
patent: 3652802 (1972-03-01), Schellenberg
patent: 4742544 (1988-05-01), Kupnicki et al.
patent: 5081619 (1992-01-01), Nagata
patent: 5233629 (1993-08-01), Paik et al.
patent: 5408499 (1995-04-01), Sasaki
patent: 5408500 (1995-04-01), Ginzburg et al.
patent: 5438571 (1995-08-01), Albrecht et al.

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