US6201452B1
Expired / Lapsed
US
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Systems and methods for converting a stream of complex numbers into a modulated radio power signal
Assignee: Unwired Planet LLC
•
Filing: 1998-12-10
•
Granted: 2001-03-13
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Expires: 2018-12-10
Abstract
Abstract Modulation systems and methods can modulate a stream of complex numbers representing a desired modulation of a radio signal by representing a real part of each of the complex numbers in a stream of complex numbers representing a desired modulation of a radio signal, as a plurality of first digits of decreasing numerical significance and representing an imaginary part of each of the complex numbers as a plurality of second digits of decreasing numerical significance. A respective one of the first digits and a respective one of the second digits of like numerical significance are grouped to form a plurality of phase control symbols. A respective phase control symbol is then used to control the phase of an output signal at the radio carrier frequency from a respective one of the plurality of power amplifiers. Each of the power amplifiers provides an output power level that is related to the numerical significance of the first and second digits that form the associated phase control symbol. The output power levels of the plurality of power amplifiers are combined to thereby form the modulated radio power signal.
Inventors
- 👤 Paul W. Dent
- 👤 Alan R. Holden
- 👤 William O. Camp, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:46
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/18; H04L27/20; H04L27/2032; H04L27/2053; H04L27/206; H04L27/2067; H04L27/2071; H03; H03F; H03F1/00; H03F1/02; H03F1/0205; H03F1/0294; H03F3/00; H03F3/20; H03F3/24
Claims Analysis
Total Claims: 52
Claim 1
Independent Claim
203 words
A method of generating a modulated radio power signal at a radio carrier frequency, the method comprising the steps of: sampling an information signal at a predetermined sampling rate to produce a series of samples of the information signal; generating a stream of complex numbers representing the series of samples of the information signal; representing a real part of each of the complex numbers as a plurality of first digits of decreasing numerical significance; representing an imaginary part of each of the complex numbers as a plurality of second digits of decreasing numerical significance; grouping a respective one of the first digits and a respective one of the second digits of like numerical significance to form a plurality of phase control symbols; using a respective phase control symbol to control the phase of an output signal at the radio carrier frequency from a respective one of a plurality of power amplifiers, each of the power amplifiers providing an output power level at an amplifier output that is related to the numerical significance of the first and second digits that form the associated phase control symbol; and combining the amplifier outputs of the plurality of power amplifiers to form the modulated radio power signal.
Claim 2
Independent Claim
203 words
A method of generating a modulated radio power signal at a radio carrier frequency, the method comprising the steps of: sampling an information signal at a predetermined sampling rate to produce a series of samples of the information signal; generating a stream of complex numbers representing the series of samples of the information signal; representing a real part of each of the complex numbers as a plurality of first digits of decreasing numerical significance; representing an imaginary part of each of the complex numbers as a plurality of second digits of decreasing numerical significance; grouping a respective one of the first digits and a respective one of the second digits of like numerical significance to form a plurality of phase control symbols; using a respective phase control symbol to control the phase of an output signal at the radio carrier frequency from a respective one of a plurality of power amplifiers, each of the power amplifiers providing an output power level at an amplifier output that is related to the numerical significance of the first and second digits that form the associated phase control symbol; and combining the amplifier outputs of the plurality of power amplifiers to form the modulated radio power signal.
Claim 3
Dependent Claim
50 words
A method according to claim 1 wherein the combining step comprises the step of applying a respective one of the amplifier outputs to a primary winding of a respective one of a plurality of transformers, the secondary windings of which are serially coupled to produce the modulated radio power signal.
Claim 4
Dependent Claim
43 words
A method according to claim 1 wherein the combining step comprises the steps of: applying a respective amplifier output to a respective quarter wave transmission line; and coupling the quarter wave transmission lines to one another to produce the modulated radio power signal.
Claim 5
Dependent Claim
66 words
A method according to claim 1 further comprising the steps of: coupling at least two of the phase control symbols of the least numerical significance to at least one linear amplifier to produce a linear output; and wherein the combining step comprises the step of combining the linear output and the amplifier outputs of the plurality of power amplifiers to form the modulated radio power signal.
Claim 6
Dependent Claim
25 words
A method according to claim 1 wherein the digits are binary digits such that each of the phase control symbols is one of four values.
Claim 7
Dependent Claim
27 words
A method according to claim 1 wherein the plurality of power amplifiers are a plurality of saturated power amplifiers that produce a constant radio frequency voltage output.
Claim 8
Dependent Claim
31 words
A method according to claim 1 wherein the plurality of power amplifiers are a plurality of bilateral power amplifiers that allow current to flow from and to an amplifier power supply.
Claim 9
Independent Claim
211 words
A system for generating a modulated radio power signal at a radio carrier frequency, the system comprising: a sampler that samples an information signal at a predetermined sampling rate to produce a series of samples of the information signal; a device that generates a stream of complex numbers representing the series of samples of the information signal; a processor that represents a real part of each of the complex numbers as a plurality of first digits of decreasing numerical significance, and that represents an imaginary part of each of the complex numbers as a plurality of second digits of decreasing numerical significance to form a plurality of phase control symbols from a respective one of the first digits and a respective one of the second digits of like numerical significance; a plurality of power amplifiers, a respective one of which amplifies a respective one of the phase control symbols modulated on the radio carrier frequency, each of the power amplifiers providing an output power level at an amplifier output that is related to the numerical significance of the first and second digits that form the associated phase control symbol; and a combining circuit that combines the amplifier outputs of the plurality of power amplifiers to form the modulated radio power signal.
Claim 10
Independent Claim
211 words
A system for generating a modulated radio power signal at a radio carrier frequency, the system comprising: a sampler that samples an information signal at a predetermined sampling rate to produce a series of samples of the information signal; a device that generates a stream of complex numbers representing the series of samples of the information signal; a processor that represents a real part of each of the complex numbers as a plurality of first digits of decreasing numerical significance, and that represents an imaginary part of each of the complex numbers as a plurality of second digits of decreasing numerical significance to form a plurality of phase control symbols from a respective one of the first digits and a respective one of the second digits of like numerical significance; a plurality of power amplifiers, a respective one of which amplifies a respective one of the phase control symbols modulated on the radio carrier frequency, each of the power amplifiers providing an output power level at an amplifier output that is related to the numerical significance of the first and second digits that form the associated phase control symbol; and a combining circuit that combines the amplifier outputs of the plurality of power amplifiers to form the modulated radio power signal.
Claim 11
Dependent Claim
50 words
A system according to claim 8 wherein the combining circuit comprises a plurality of transformers each having a primary winding and a secondary winding, a respective primary winding being coupled to a respective power amplifier, the plurality of secondary windings being serially coupled to produce the modulated radio power signal.
Claim 12
Dependent Claim
45 words
A system according to claim 8 wherein the combining circuit comprises a plurality of quarter wavelength transmission lines, a respective one of which is coupled between a respective power amplifier and an output node to produce the modulated radio power signal at the output node.
Claim 13
Dependent Claim
25 words
A system according to claim 8 wherein the digits are binary digits such that each of the phase control symbols has one of four values.
Claim 14
Dependent Claim
26 words
A system according to claim 8 wherein the power amplifiers are saturated power amplifiers that produce a constant radio frequency voltage output at the amplifier output.
Claim 15
Dependent Claim
25 words
A system according to claim 8 wherein the power amplifiers are bilateral power amplifiers that allow current flow from and to an amplifier power supply.
Claim 16
Dependent Claim
83 words
A system according to claim 8 further comprising at least one linear amplifier that is associated with at least two of the phase control symbols of least numerical significance, to generate a linear output voltage at an output thereof that is proportional to the combined values of the at least two of the first and second digits of least numerical significance, wherein the combining circuit combines the output of the at least one linear amplifier and the amplifier outputs of the power amplifiers.
Claim 17
Independent Claim
188 words
A system for generating a modulated radio power signal at a radio carrier frequency, the system comprising: means for sampling an information signal at a predetermined sampling rate to produce a series of samples of the information signal; means for generating a stream of complex numbers representing the series of samples of the information signal; means for representing a real part of each of the complex numbers as a plurality of first digits of decreasing numerical significance and for representing an imaginary part of each of the complex numbers as a plurality of second digits of decreasing numerical significance to form a plurality of phase control symbols from a respective one of the first digits and a respective one of the second digits of like numerical significance; means for power amplifying a respective one of the phase control symbols modulated on the radio carrier frequency to provide a plurality of output power levels that are related to the numerical significance of the first and second digits that form the associated phase control symbol; and means for combining the output power levels to form the modulated radio power signal.
Claim 18
Independent Claim
188 words
A system for generating a modulated radio power signal at a radio carrier frequency, the system comprising: means for sampling an information signal at a predetermined sampling rate to produce a series of samples of the information signal; means for generating a stream of complex numbers representing the series of samples of the information signal; means for representing a real part of each of the complex numbers as a plurality of first digits of decreasing numerical significance and for representing an imaginary part of each of the complex numbers as a plurality of second digits of decreasing numerical significance to form a plurality of phase control symbols from a respective one of the first digits and a respective one of the second digits of like numerical significance; means for power amplifying a respective one of the phase control symbols modulated on the radio carrier frequency to provide a plurality of output power levels that are related to the numerical significance of the first and second digits that form the associated phase control symbol; and means for combining the output power levels to form the modulated radio power signal.
Claim 19
Dependent Claim
28 words
A system according to claim 15 wherein the combining means comprises: means for serially combining the plurality of output power levels to produce the modulated radio power signal.
Claim 20
Dependent Claim
42 words
A system according to claim 15 wherein the combining means comprises: means for converting the plurality of output power levels to a plurality Of output currents; and means for combining the plurality of output currents to produce the modulated radio power signal.
Claim 21
Dependent Claim
25 words
A system according to claim 15 wherein the digits are binary digits such that each of the phase control symbols has one of four values.
Claim 22
Dependent Claim
60 words
A system according to claim 15 further comprising means for generating a linear output voltage that is proportional to the combined values of at least two of the first and second digits of least numerical significance, wherein the combining means comprises means for combining the linear output voltage and the output power levels to form the modulated radio power signal.
Claim 23
Independent Claim
248 words
A system for generating a modulated radio power signal at a radio carrier frequency, the system comprising: a sampler that samples an information signal at a predetermined sampling rate to produce a series of samples of the information signal; a device that generates a stream of complex numbers representing the series of samples of the information signal; a processor that represents a real part of each of the complex numbers as a plurality of first digits of decreasing numerical significance, and that represents an imaginary part of each of the complex numbers as a plurality of second digits of decreasing numerical significance; a plurality of phase modulators, a respective one of which is responsive to a respective one of the plurality of first digits and a respective one of the plurality of second digits of like numerical significance, and to the radio carrier frequency, to produce a phase modulated output at the radio carrier frequency; a plurality of power amplifiers, a respective one of which amplifies a respective one of the phase modulated outputs of the phase modulators to an amplifier power level at an amplifier output thereof; and a combining circuit that combines the amplifier outputs of the power amplifiers according to a combining ratio to produce the modulated radio power signal, at least one of the amplifier power level and the combining ratio being selected such that the modulated radio power signal is related to the numerical significance of the plurality of first and second digits.
Claim 24
Independent Claim
248 words
A system for generating a modulated radio power signal at a radio carrier frequency, the system comprising: a sampler that samples an information signal at a predetermined sampling rate to produce a series of samples of the information signal; a device that generates a stream of complex numbers representing the series of samples of the information signal; a processor that represents a real part of each of the complex numbers as a plurality of first digits of decreasing numerical significance, and that represents an imaginary part of each of the complex numbers as a plurality of second digits of decreasing numerical significance; a plurality of phase modulators, a respective one of which is responsive to a respective one of the plurality of first digits and a respective one of the plurality of second digits of like numerical significance, and to the radio carrier frequency, to produce a phase modulated output at the radio carrier frequency; a plurality of power amplifiers, a respective one of which amplifies a respective one of the phase modulated outputs of the phase modulators to an amplifier power level at an amplifier output thereof; and a combining circuit that combines the amplifier outputs of the power amplifiers according to a combining ratio to produce the modulated radio power signal, at least one of the amplifier power level and the combining ratio being selected such that the modulated radio power signal is related to the numerical significance of the plurality of first and second digits.
Claim 25
Dependent Claim
57 words
A system according to claim 20 wherein each of the power amplifiers produces same amplifier power level and wherein the combining ratio is selected such that the amplifier outputs of the power amplifiers are combined according to a ratio that is related to the numerical significance of the digits that are associated with the respective power amplifier.
Claim 26
Dependent Claim
36 words
A system according to claim 20 wherein the combining ratio is unity and wherein the amplifier power level of a respective power amplifier is related to the numerical significance of the digits that are associated therewith.
Claim 27
Dependent Claim
39 words
A system according to claim 20 wherein both the amplifier power level and the combining ratio are selected such that the modulated radio power signal is related to the numerical significance of the plurality of first and second digits.
Claim 28
Dependent Claim
50 words
A system according to claim 20 wherein the combining circuit comprises a plurality of transformers each having a primary winding and a secondary winding, a respective primary winding being coupled to a respective power amplifier, the plurality of secondary windings being serially coupled to produce the modulated radio power signal.
Claim 29
Dependent Claim
45 words
A system according to claim 20 wherein the combining circuit comprises a plurality of quarter wavelength transmission lines, a respective one of which is coupled between a respective power amplifier and an output node to produce the modulated radio power signal at the output node.
Claim 30
Dependent Claim
25 words
A system according to claim 20 wherein the digits are binary digits such that each of the phase modulated outputs has one of four values.
Claim 31
Dependent Claim
27 words
A system according to claim 20 wherein the power amplifiers are saturated power amplifiers that produce a constant radio frequency voltage output at the amplifier power level.
Claim 32
Dependent Claim
25 words
A system according to claim 20 wherein the power amplifiers are bilateral power amplifiers that allow current flow from and to an amplifier power supply.
Claim 33
Dependent Claim
84 words
A system according to claim 20 further comprising at least one linear amplifier that is associated with at least two of the first and second digits of least numerical significance, to generate a linear output voltage at an output thereof that is proportional to the combined values of the at least two of the first and second digits of least numerical significance, wherein the combining circuit combines the output of the at least one linear amplifier and the amplifier outputs of the power amplifiers.
Claim 34
Independent Claim
204 words
A system for generating a modulated radio power signal at a radio carrier frequency, the system comprising: means for sampling an information signal at a predetermined sampling rate to produce a series of samples of the information signal; means for generating a stream of complex numbers representing the series of samples of the information signal; means for representing a real part of each of the complex numbers as a plurality of first digits of decreasing numerical significance and for representing an imaginary part of each of the complex numbers as a plurality of second digits of decreasing numerical significance; means for producing a plurality of phase modulated outputs at the radio carrier frequency in response to the plurality of first digits, the plurality of second digits and the radio carrier frequency; means for amplifying a respective one of the phase modulated outputs to a respective power level; and means for combining the amplified phase modulated outputs according to a combining ratio to produce the modulated radio power signal, at least one of the respective amplifier power level and the combining ratio being selected such that the modulated radio power signal is related to the numerical significance of the plurality of first and second digits.
Claim 35
Independent Claim
204 words
A system for generating a modulated radio power signal at a radio carrier frequency, the system comprising: means for sampling an information signal at a predetermined sampling rate to produce a series of samples of the information signal; means for generating a stream of complex numbers representing the series of samples of the information signal; means for representing a real part of each of the complex numbers as a plurality of first digits of decreasing numerical significance and for representing an imaginary part of each of the complex numbers as a plurality of second digits of decreasing numerical significance; means for producing a plurality of phase modulated outputs at the radio carrier frequency in response to the plurality of first digits, the plurality of second digits and the radio carrier frequency; means for amplifying a respective one of the phase modulated outputs to a respective power level; and means for combining the amplified phase modulated outputs according to a combining ratio to produce the modulated radio power signal, at least one of the respective amplifier power level and the combining ratio being selected such that the modulated radio power signal is related to the numerical significance of the plurality of first and second digits.
Claim 36
Dependent Claim
65 words
A system according to claim 30 wherein the means for amplifying comprises means for amplifying a respective one of the phase modulated outputs to same power level and wherein the combining ratio is selected such that the phase modulated outputs are combined according to a ratio that is related to the numerical significance of the digits that are associated with the respective phase modulated output.
Claim 37
Dependent Claim
31 words
A system according to claim 30 wherein the combining ratio is unity and wherein the respective power levels are related to the numerical significance of the digits that are associated therewith.
Claim 38
Dependent Claim
39 words
A system according to claim 30 wherein both the respective power level and the combining ratio are selected such that the modulated radio power signal is related to the numerical significance of the plurality of first and second digits.
Claim 39
Dependent Claim
27 words
A system according to claim 30 wherein the combining means comprises: means for serially combining the plurality of power levels to produce the modulated radio power signal.
Claim 40
Dependent Claim
41 words
A system according to claim 30 wherein the combining means comprises: means for converting the plurality of power levels to a plurality of output currents; and means for combining the plurality of output currents to produce the modulated radio power signal.
Claim 41
Dependent Claim
25 words
A system according to claim 30 wherein the digits are binary digits such that each of the phase modulated outputs has one of four values.
Claim 42
Dependent Claim
60 words
A system according to claim 30 further comprising means for generating a linear output voltage that is proportional to the combined values of at least two of the first and second digits of least numerical significance, wherein the combining means comprises means for combining the linear output voltage and the output power levels to form the modulated radio power signal.
Claim 43
Independent Claim
202 words
A method for generating a modulated radio power signal at a radio carrier frequency, the method comprising the steps of: sampling an information signal at a predetermined sampling rate to produce a series of samples of the information signal; generating a stream of complex numbers representing the series of samples of the information signal; representing a real part of each of the complex numbers as a plurality of first digits of decreasing numerical significance; representing an imaginary part of each of the complex numbers as a plurality of second digits of decreasing numerical significance; modulating a respective one of the plurality of first digits and a respective one of the plurality of second digits of like numerical significance onto the radio carrier frequency, to produce a plurality of phase modulated outputs at the radio carrier frequency; amplifying a respective one of the phase modulated outputs to a power level; and combining the amplified phase modulated outputs according to a combining ratio to produce the modulated radio power signal, at least one of the power level and the combining ratio being selected such that the modulated radio power signal is related to the numerical significance of the plurality of first and second digits.
Claim 44
Independent Claim
202 words
A method for generating a modulated radio power signal at a radio carrier frequency, the method comprising the steps of: sampling an information signal at a predetermined sampling rate to produce a series of samples of the information signal; generating a stream of complex numbers representing the series of samples of the information signal; representing a real part of each of the complex numbers as a plurality of first digits of decreasing numerical significance; representing an imaginary part of each of the complex numbers as a plurality of second digits of decreasing numerical significance; modulating a respective one of the plurality of first digits and a respective one of the plurality of second digits of like numerical significance onto the radio carrier frequency, to produce a plurality of phase modulated outputs at the radio carrier frequency; amplifying a respective one of the phase modulated outputs to a power level; and combining the amplified phase modulated outputs according to a combining ratio to produce the modulated radio power signal, at least one of the power level and the combining ratio being selected such that the modulated radio power signal is related to the numerical significance of the plurality of first and second digits.
Claim 45
Dependent Claim
66 words
A method according to claim 38 wherein the amplifying step comprises the step of amplifying a respective one of the phase modulated outputs to same power level; wherein the combining ratio is selected such that the amplified phase modulated outputs are combined according to a combining ratio that is related to the numerical significance of the digits that are associated with the respective phase modulated output.
Claim 46
Dependent Claim
31 words
A method according to claim 38 wherein the combining ratio is unity and wherein the respective power levels are related to the numerical significance of the digits that are associated therewith.
Claim 47
Dependent Claim
39 words
A method according to claim 38 wherein both the respective power level and the combining ratio are selected such that the modulated radio power signal is related to the numerical significance of the plurality of first and second digits.
Claim 48
Dependent Claim
28 words
A method according to claim 38 wherein the combining step comprises the step of: serially combining the plurality of power levels to produce the modulated radio power signal.
Claim 49
Dependent Claim
40 words
A method according to claim 38 wherein the combining step comprises the steps of: converting the plurality of power levels to a plurality of output currents; and combining the plurality of output currents to produce the modulated radio power signal.
Claim 50
Dependent Claim
25 words
A method according to claim 38 wherein the digits are binary digits such that each of the phase modulated outputs has one of four values.
Claim 51
Dependent Claim
62 words
A method according to claim 38 further comprising the step of generating a linear output voltage that is proportional to the combined values of at least two of the first and second digits of least numerical significance, wherein the combining step comprises the step of combining the linear output voltage and the output power levels to form the modulated radio power signal.
Claim 52
Dependent Claim
32 words
A method according to claim 38 wherein the real part is represented at successive odd instants of a clock and the imaginary part is represented at successive even instants of the clock.
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