Multi-mode transmitter and receiver

Details Multi-mode transmitter and receiver Multi-mode transmitter and receiver

1998-11-24

2000-07-11

Bocure, Tesfaldet

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

375140, 375316, 375295, H04L 2728, H04L 2704, H04L 2706, H04K 100

Patent

active

060883995

ABSTRACT:
A transmitter (300) comprises summers (301-307, 3178-319), and mixers (309-315, 333). During multi-carrier transmission, multiple I and Q components enter the transmitter. I.sub.1 is summed with I.sub.3, Q.sub.3 is subtracted from Q.sub.1, Q.sub.1 is added to Q.sub.3, and I.sub.3 is subtracted from I.sub.1. The outputs of a first and a second summer (301, 305) enters a first and a second mixer (309, 313) where they are mixed by a cosine function. Similarly, the outputs of a third and a fourth summer (303, 307) enter a third and a fourth mixer (311, 315) where they are mixed by a sine function. The output from first and the second mixer (309, 311) enter a first summer (317) where they are summed along with the I.sub.2 component. The output from the third and the fourth mixer (313, 315) enters a second summer (319) where they are summed along with the Q.sub.2 component.

REFERENCES:
patent: 4571549 (1986-02-01), Lobs et al.
patent: 5175514 (1992-12-01), Iinuma et al.
patent: 5412351 (1995-05-01), Nystrom et al.
patent: 5638401 (1997-06-01), Jones
patent: 5903611 (1999-05-01), Schnabl et al.

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