Method and apparatus for efficient bandwidth communication

Details Method and apparatus for efficient bandwidth communication Method and apparatus for efficient bandwidth communication

2003-10-28

2008-10-14

Tran, Khai (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

Reexamination Certificate

active

07436894

ABSTRACT:
A method and apparatus for improving the bandwidth efficiency of a constant envelope continuous phase modulation waveform and transmitting data in a bandwidth efficient manner is disclosed. The method and apparatus utilizes a non-constant envelope continuous phase modulation signal which possesses many of the advantages of a multiple modulation index continuous phase modulation signal. One such advantage is the natural trellis structure of a multiple modulation index continuous phase modulation signal. In comparison to a constant envelope continuous phase modulation waveform, the non-constant envelope continuous phase modulation signal possesses a reduced transmit signal spectra and may also be demodulated by a standard maximum likelihood demodulator without any loss of performance.

REFERENCES:
patent: 6944206 (2005-09-01), Dent
patent: 2002/0168026 (2002-11-01), Khoini-Porfard
patent: 2003/0128656 (2003-07-01), Scarpa
John B. Anderson, Tor Aulin, and Carl-Erik Sunderberg, “Digital Phase Modulation,” Jan. 1986, pp. 50-52.

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