Method and apparatus for constant envelope quadrature amplitude

Details Method and apparatus for constant envelope quadrature amplitude Method and apparatus for constant envelope quadrature amplitude

1997-09-16

2000-07-18

Chin, Stephen

Pulse or digital communications

Transmitters

Quadrature amplitude modulation

375261, 332103, H04L 2736

Patent

active

060917849

ABSTRACT:
A constant envelope quadrature amplitude modulation system is provided for solving the bandwidth efficiency problem resulting from a lack of frequency resources by implementing the constant envelope characteristic for a non-linear communication system, based on a 16-QAM (Quadrature Amplitude Modulation) system. The system limits the data, which will be modulated and transmitted, to 3-bit data and adds a parity bit to make the data have a constant envelope within the 16-QAM system, which modulates data to be transmitted in the unit of 4-bit. The data value of the parity bit is selected to satisfy the condition of a constant envelope in accordance with the QAM signals.

REFERENCES:
patent: 4495619 (1985-01-01), Acampora
patent: 4730344 (1988-03-01), Saha
patent: 5659578 (1997-08-01), Alamouti et al.

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