Systems with increased information rates using embedded sample m

Details Systems with increased information rates using embedded sample m Systems with increased information rates using embedded sample m

1993-10-18

1995-09-05

Grimm, Siegfried H.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

329300, 329304, 329311, 329318, 332100, 332107, 332115, 332123, 375229, 375240, 375242, 375257, H03C 300, H03D 300, H04L 2720, H04L 2722

Patent

active

054482062

ABSTRACT:
A system is described which achieves an increased rate of transmission by transmitting multiple symbols in one symbol time. The information in the overlapping symbols can be recovered if the symbol used for transmission is chosen so that a subset of the samples representing the symbol has an inverse. The construction of suitable symbols is illustrated. Effective operation of the system depends on equalizaton which will recover the the baseband signal shape. Methods of equalization are depicted which are suitable for use with this sytem including equalization realized by predistorting the signal at the transmitter so that it arrives at the receiver undistorted. The invention is applied to to baseband and passband systems and the application of predistortion equalization to the fading passband channel is described.

REFERENCES:
patent: 4615038 (1986-09-01), Lim et al.
patent: 5105445 (1992-04-01), Karam et al.

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