Constant envelope quadrature-quadrature amplitude modulation sys

Details Constant envelope quadrature-quadrature amplitude modulation sys Constant envelope quadrature-quadrature amplitude modulation sys

1997-11-14

1999-07-06

Grimm, Siegfried H.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

375298, H04L 2736

Patent

active

059202378

ABSTRACT:
A constant envelope quadrature-quadrature amplitude modulation system limits the data, which will be transmitted, to 4-bit and adds 4-bit parity to make them have a constant envelope in the Q.sup.2 AM system, which modulates 8-bit in units of 2-bit. The system includes: a constant envelope encoder 52 for adding 4-bit parity to 4-bit input information; four mappers 12 to 15 for respectively generating level signals corresponding to data values of 2-bit among 8-bit data generated by the constant envelope encoder 52; four mixers 16 to 19 for respectively mixing the level signals generated by the four mappers 12 to 15 with different predetermined frequency signals; and adder 20 for adding up the signals generated by the four mixers 16 to 19.

REFERENCES:
patent: 5638401 (1997-06-01), Jones
patent: 5784412 (1998-07-01), Ichihara

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