Radio with peak power and bandwidth efficient modulation

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

1995-06-12

1997-04-15

Chin, Stephen

Pulse or digital communications

Transmitters

Quadrature amplitude modulation

375295, 332103, H04L 2736

Patent

active

056217625

ABSTRACT:
A communication device (300) includes a digital modulator (301), a Digital Signal Processor (306), and an amplifier (312). The digital modulator (301) includes an information generator (304) and a peak suppression device (402). The peak suppression device (402) includes a symbol mapper (404) and a symbol scaler (406). The information generated by the generator (401) are mapped on a constellation diagram via the symbol mapper (404). The mapped information is then scaled at the scaler (406) in order to reduce the peak-to-average ratio of the signal at the input to the amplifier (312).

REFERENCES:
patent: 5164963 (1992-11-01), Lawrence et al.
patent: 5282226 (1994-01-01), Critchlow
patent: 5381449 (1995-01-01), Jasper et al.
patent: 5394440 (1995-02-01), Goldstein et al.
patent: 5406588 (1995-04-01), Birchler et al.

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