Modulated RF pulse waveform generation method and device

Details Modulated RF pulse waveform generation method and device Modulated RF pulse waveform generation method and device

2001-11-27

2003-09-02

Pascal, Robert (Department: 2817)

Modulators

Pulse or interrupted continuous wave modulator

C332S103000

Reexamination Certificate

active

06614323

ABSTRACT:

FIELD OF THE INVENTION
In general, the present invention relates to the field of communication systems. More specifically, the present invention relates to the generation of a modulated radio frequency (“RF”) pulse waveform.
BACKGROUND OF THE INVENTION
U.S. Pat. No. 5,838,210 is directed toward an efficient generation of wideband pulse modulated signals from quadrature baseband signals. However, U.S. Pat. No. 5,838,210 discloses an analog based apparatus for generating the wideband pulse modulated signals whereby a considerable in-band distortion can occur (i.e., there is a failure to achieve linear modulation). Thus, the current movement is toward digital based apparatuses having minimal any in-band distortion. Click modulation as known in the art is a method for generating wideband pulse modulated waves without distortion based upon an employment of an ideal filter. However, a drawback of prior art click modulation is a failure to implement an ideal filter which necessitates an employment of a complex filter in order to suppress distortion to acceptable levels (i.e., there is a failure to achieve linear modulation).
Thus, there is a need for an efficient and simple transmitter for generating RF pulse signals without the need for a complex filter.
SUMMARY OF THE INVENTION
One form of the present invention is a method comprising a reception of a complex baseband signal; and a generation of a pulse modulated signal in response to a reception of the complex baseband signal where the pulse modulated signal is a linear modulation of the complex baseband signal.
A second form of the present invention is a method comprising a reception of a complex baseband signal in analog form; a generation of a complex modulated signal in response to a reception of the complex baseband signal where the complex modulated signal is a function of the complex baseband signal; a generation of a first bandlimited exponential signal in response to a generation of the complex modulated signal where the first bandlimited exponential is a function of the complex modulated signal as computed with a first truncated series for an exponential; and a generation of a pulse modulated signal in response to a generation of the first bandlimited exponential signal where the pulse modulated signal is a function of the first bandlimited exponential signal.
A third form of the present invention is a method comprising a reception of a complex baseband signal in digital form; a generation of a first complex modulated signal in response to a reception of the complex baseband signal where the first complex modulated signal is a function of the complex baseband signal; a generation of a first coefficient vector in response to a generation of the complex baseband signal where the first coefficient vector is a function of the first complex modulated signal; and a generation of a pulse modulated signal in response to a generation of the first coefficient vector signal where the pulse modulated signal is a function of the first coefficient vector signal.
Additional forms of the present invention include devices for implementing the aforementioned methods.


REFERENCES:
patent: 5473280 (1995-12-01), Ohnishi et al.
patent: 5805640 (1998-09-01), O'Dea et al.
patent: 5838210 (1998-11-01), Midya et al.
“Integral Noise Shaping for Quantization of Pulse Width Modulation”: Pallab Midya & Matt Miller; Motorola Labs, Schaumburg, Illinois and Mark Sandler, Kings College, London. An audio engineering society preprint, presented at the 109thConvention Sep. 22-25, 2000 in Los Angeles, California, USA.
“Prediction Correction Algorith for Natural Pulse Width Modulation”: Pallab Midya, Bill Roeckner, Pat Rakers, & Poojan Wagh; Motorola Labs, Schaumburg, Illinois. An audio engineering society preprint, presented at the 109thConvention Sep. 22-25, 2000 in Los Angeles, California, USA.
“Theory and Implementation of a New Type of Digital Power Amplifiers for Audio Applications”: Martin Streitenberger, Helmut Bresch, & Wolfgang Mathis; Otto Von Guericke University Madgedburg. Presented at IEEE International Symposium on Circuits and Systems, May 28-31, 2000 in Geneva, Switzerland.
“Click Modulation”: B.F. Logan, Jr.; Mar. 1984 AT&T Bell Laboratories.
“Theory of Analytic Modulation Systems”: B.F Logan, Jr.; AT&T. Published in The Bell System Technical Journal on Mar. 1978.

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