Radio with peak power and bandwidth efficient modulation using a

Details Radio with peak power and bandwidth efficient modulation using a Radio with peak power and bandwidth efficient modulation using a

1995-06-26

1997-02-25

Bocure, Tesfaldet

Pulse or digital communications

Transmitters

Quadrature amplitude modulation

375296, H04L 2736

Patent

active

056065787

ABSTRACT:
A communication device (300) includes a digital modulator (301), a digital to analog converter (308), an RF mixer (310) (306), and an amplifier(312). The digital modulator (301) includes an information generator (304) and a signal processor (306). The processor responds (306) to the generator (304) by alternately mapping the digital information onto a first (502) or a second (504) constellation diagram to produce data symbols. The processor (306) processes the data symbols alternately from the first and second constellation diagrams (502, 504) in order to minimize the peak to average power ratio at the amplifier (312). This alternating scheme allows the power amplifier to operate more efficiently and thereby conserve precious battery energy.

REFERENCES:
patent: 4891806 (1990-01-01), Farias et al.
patent: 5377194 (1994-12-01), Calderbank
patent: 5381449 (1995-01-01), Jasper et al.
patent: 5394440 (1995-02-01), Goldstein et al.
patent: 5406588 (1995-04-01), Bircher et al.

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