Data bit to constellation symbol mapper

Details Data bit to constellation symbol mapper Data bit to constellation symbol mapper

1991-04-09

1993-02-09

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

371 43, H04L 512

Patent

active

051857634

ABSTRACT:
The present invention is directed toward a method and apparatus in a communications device for mapping a selected group of data bits into a predetermined number of two-dimensional symbols selected from a minimized alphabet of M two-dimensional symbols forming a symbol constellation, with one of the two-dimensional symbols being transmitter during each symbol (i.e., baud) interval. A plurality of symbol mappers in an adaptive communications device use a superframe of bits per baud. Each superframe includes at least two groups of frames, a low bit frame and a high bit frame. The superframe has A) one of these two types of frames uses whole bits per baud and the other uses fractional bits per baud or B) both of these two types of frames will use fractional bits per baud.

REFERENCES:
patent: 4761784 (1988-08-01), Srinivasagopalan et al.
patent: 4807230 (1989-02-01), Srinivasagopalan et al.
patent: 4891806 (1990-01-01), Farias et al.
patent: 5022053 (1991-06-01), Chung et al.
patent: 5052000 (1991-09-01), Wang et al.
CCITT Standard for V32 "A Family of 2-Wire, Duplex Modems Operating at Data Signaling Rates of up to 9600 bit/s for Use on the General Switched Telephone Network and on Leased" 1984, amended 1988, pp. 234-262.

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