US5422909A — Method and apparatus for multi-phase component do…

Claim 1

Independent Claim 105 words

A downconverter, comprising: an analog-to-digital converter operatively coupled to receive an intermediate frequency signal and to provide a digital signal at a sampling rate; a Hilbert transformation network operatively coupled to said analog-to-digital converter to provide a passband quadrature component of the digital signal; a delay element operatively coupled to said analog-to-digital converter to provide a passband in-phase component of the digital signal; and a digital translator operatively coupled to said Hilbert transformation network and said delay element to alter the passband quadrature and passband in-phase components based on at least one predetermined pattern to provide a baseband quadrature signal and a baseband in-phase signal.

Claim 2

Dependent Claim 105 words

A downconverter, comprising: an analog-to-digital converter operatively coupled to receive an intermediate frequency signal and to provide a digital signal at a sampling rate; a Hilbert transformation network operatively coupled to said analog-to-digital converter to provide a passband quadrature component of the digital signal; a delay element operatively coupled to said analog-to-digital converter to provide a passband in-phase component of the digital signal; and a digital translator operatively coupled to said Hilbert transformation network and said delay element to alter the passband quadrature and passband in-phase components based on at least one predetermined pattern to provide a baseband quadrature signal and a baseband in-phase signal.

Claim 3

Dependent Claim 50 words

A downconverter according to claim 1, further comprising a selector operatively coupled to said Hilbert transformation network and said delay element to alternately select the passband quadrature component and the passband in-phase component to provide selected components of the passband quadrature component and passband in-phase component to said digital translator.

Claim 4

Dependent Claim 80 words

A downconverter according to claim 2, wherein said digital translator comprises: a quadrature translator operatively coupled to receive the selected passband quadrature components from said selector and to alter the selected passband quadrature components based on a first predetermined pattern to provide the baseband quadrature signal; and an in-phase translator operatively coupled to receive the selected passband in-phase components from said selector to alter the passband inphase components based on a second predetermined pattern to provide the baseband in-phase signal.

Claim 5

Dependent Claim 35 words

A downconverter according to claim 1, further comprising a decimator operatively coupled to receive the digital signal from said analog-to-digital converter and alternately provide the digital signal to said transformation network and said delay element.

Claim 6

Dependent Claim 67 words

A downconverter according to claim 4, wherein said digital translator comprises: a quadrature translator operatively coupled to said Hilbert transformation network to alter the passband quadrature component based on a first predetermined pattern to provide the baseband quadrature signal; and an in-phase translator operatively coupled to said delay element to alter the passband in-phase component based on a second predetermined pattern to provide the baseband in-phase signal.

Claim 7

Dependent Claim 56 words

A downconverter according to claim 1, wherein said digital translator further comprises a pseudorandom sequence demodulator operatively coupled to said transformation network and said delay element to alter the passband quadrature and passband in-phase components based on both the predetermined pattern and a pseudorandom sequence to provide the baseband quadrature signal and the baseband in-phase signal.

Claim 8

Dependent Claim 134 words

A downconverter according to claim 1, further comprising: an early translator operatively coupled to said Hilbert transformation network and said delay element to alter the passband quadrature and passband in-phase components based on a predetermined pattern to provide an early baseband quadrature signal and an early baseband in-phase signal; a late translator operatively coupled to said Hilbert transformation network and said delay element to alter the passband quadrature and passband in-phase components based on a predetermined pattern to provide a late baseband quadrature signal and a late baseband in-phase signal; and a selector operatively coupled to said early translator, said late translator and said digital translator to select the baseband quadrature signal and the baseband in-phase signal from one of said early, late and digital translators based on a quality of the selected signals.

Claim 9

Dependent Claim 30 words

A downconverter according to claim 1, wherein the components consist of binary numbers and wherein said digital translator changes a sign of the binary numbers according to the predetermined pattern.

Claim 10

Dependent Claim 24 words

A downconverter according to claim 1, wherein the sampling rate of said analog-to-digital converter is 4× the intermediate frequency of the intermediate frequency signal.

Claim 11

Dependent Claim 101 words

A downconverter according to claim 1, further comprising an automatic gain control circuit comprising: a signal strength indicator circuit operatively coupled to receive the baseband quadrature signal and the baseband in-phase signal and to produce a signal strength indicator signal representative thereof; a short term average estimator operatively coupled to receive the signal strength indicator signal and produce a short term average signal; and an adaptive long term average estimator operatively coupled to receive the short term average signal from said average signal selector switch to provide a long term average signal as a basis for the feedback gain control signal.

Claim 12

Dependent Claim 140 words

A downconverter according to claim 10, wherein said short term average estimator comprises: a present short term average estimator operatively coupled to receive the signal strength indicator signal and produce a present short term average signal; a previous average lock estimator operatively coupled to receive the signal strength indicator signal and produce a previous average lock signal; an average signal selector switch operatively coupled to select one of the present short term average from said present short term average estimator and the previous average lock signal from said previous average lock estimator to provide a short term average signal; and discontinuous transmission detection circuit operatively coupled to said signal strength indicator circuit and said average signal selector switch to detect a discontinuous transmission on the baseband quadrature signal and the baseband in-phase signal to control said average signal selector switch.

Claim 13

Dependent Claim 125 words

A receiver, comprising: an analog-to-digital converter operatively coupled to sample an intermediate frequency signal at a sampling rate and provide a digital signal; a first transformation network operatively coupled to said analog-to-digital converter to provide a passband quadrature component of the digital signal; a second transformation network operatively coupled to said analog-to-digital converter to provide a passband in-phase component of the digital signal; a digital translator operatively coupled to said first transformation network and said second transformation network to alter the passband quadrature and passband in-phase components based on at least one predetermined pattern to provide a baseband quadrature signal and a baseband in-phase signal; and a DC estimator operatively coupled to substantially eliminate DC from the baseband quadrature signal and the baseband in-phase signal.

Claim 14

Dependent Claim 125 words

A receiver, comprising: an analog-to-digital converter operatively coupled to sample an intermediate frequency signal at a sampling rate and provide a digital signal; a first transformation network operatively coupled to said analog-to-digital converter to provide a passband quadrature component of the digital signal; a second transformation network operatively coupled to said analog-to-digital converter to provide a passband in-phase component of the digital signal; a digital translator operatively coupled to said first transformation network and said second transformation network to alter the passband quadrature and passband in-phase components based on at least one predetermined pattern to provide a baseband quadrature signal and a baseband in-phase signal; and a DC estimator operatively coupled to substantially eliminate DC from the baseband quadrature signal and the baseband in-phase signal.

Claim 15

Dependent Claim 114 words

A receiver according to claim 12, wherein said DC estimator comprises: a first delay element operatively coupled to receive the baseband quadrature component from said digital translator; a first adder operatively coupled to said first delay element; a second delay element operatively coupled to receive the in-phase quadrature component from said digital translator; a second adder operatively coupled to said second delay element; a first DC estimation filter operatively coupled to receive the baseband quadrature component from said digital translator and provide an output to said first adder; and a second DC estimation filter operatively coupled to receive the inphase quadrature component from said digital translator and provide an output to said second adder.

Claim 16

Dependent Claim 122 words

A receiver according to claim 12, wherein said receiver further comprises a distribution switch operatively coupled to said analog-to-digital converter to receive the digital signal; and wherein said DC estimator comprises: a first delay element operatively coupled to receive the baseband quadrature component from said digital translator; a first adder operatively coupled to said first delay element; a second delay element operatively coupled to receive the in-phase quadrature component from said digital translator; a second adder operatively coupled to said second delay element; a first DC estimation filter operatively coupled to said distribution switch to provide an output to said first adder; and a second DC estimation filter operatively coupled to said distribution switch and provide an output to said second adder.

Claim 17

Dependent Claim 50 words

A receiver according to claim 12, further comprising a selector operatively coupled to alternately select the passband quadrature component and the passband in-phase component from said first transformation network and said second transformation network to provide selected components of the passband quadrature and passband in-phase components to said digital translator.

Claim 18

Dependent Claim 32 words

A receiver according to claim 12, further comprising a decimator operatively coupled to alternately provide the digital signal from said analog-to-digital converter to said first transformation network and said second transformation network.

Claim 19

Dependent Claim 100 words

A receiver according to claim 16, wherein said DC estimator comprises: a first delay element operatively coupled to receive the baseband quadrature component from said digital translator; a first adder operatively coupled to said first delay element; a second delay element operatively coupled to receive the in-phase quadrature component from said digital translator; a second adder operatively coupled to said second delay element; a first DC estimation filter operatively coupled to said decimator to provide an output to said first adder; and a second DC estimation filter operatively coupled to said decimator to provide an output to said second adder.

Claim 20

Dependent Claim 30 words

A receiver according to claim 12, wherein the components consist of binary numbers and wherein said digital translator changes a sign of the binary numbers according to the predetermined pattern.

Claim 21

Dependent Claim 13 words

A receiver according to claim 12, wherein said receiver is a TDMA receiver.

Claim 22

Dependent Claim 66 words

A receiver according to claim 12, wherein said receiver is a CDMA receiver; and wherein said digital translator further comprises a pseudorandom sequence demodulator operatively coupled to said first transformation network and said second transformation network to alter the passband quadrature and passband in-phase components based on both the predetermined pattern and the pseudorandom sequence to provide the baseband quadrature signal and the baseband in-phase signal.

Claim 23

Dependent Claim 136 words

A receiver according to claim 20, further comprising: an early translator operatively coupled to said first transformation network and said second transformation network to alter the passband quadrature and passband in-phase components based on a predetermined pattern to provide an early baseband quadrature signal and an early baseband in-phase signal; a late translator operatively coupled to said first transformation network and said second transformation network to alter the passband quadrature and passband in-phase components based on a predetermined pattern to provide a late baseband quadrature signal and a late baseband in-phase signal; and a selector operatively coupled to said early translator, said late translator and said digital translator to select the baseband quadrature signal and the baseband in-phase signal from one of said early, late and digital translators based on a quality of the selected signals.

Claim 24

Dependent Claim 82 words

A CDMA receiver, comprising: analog-to-digital converting means for sampling an IF signal at a sampling rate to provide a digital signal; transformation means for transforming the digital signal to provide a passband quadrature component of the digital signal and a passband in-phase component of the digital signal; and translator means for altering and despreading the passband quadrature and passband in-phase components based on both a predetermined pattern and a pseudorandom sequence to provide a baseband quadrature signal and a baseband in-phase signal.

Claim 25

Dependent Claim 82 words

A CDMA receiver, comprising: analog-to-digital converting means for sampling an IF signal at a sampling rate to provide a digital signal; transformation means for transforming the digital signal to provide a passband quadrature component of the digital signal and a passband in-phase component of the digital signal; and translator means for altering and despreading the passband quadrature and passband in-phase components based on both a predetermined pattern and a pseudorandom sequence to provide a baseband quadrature signal and a baseband in-phase signal.

Claim 26

Independent Claim 77 words

A method for down-converting a signal, the method comprising the steps of: (a) sampling an intermediate frequency signal at a sampling rate to produce a digital signal; (b) transforming the digital signal to produce a passband quadrature component; (c) delaying the digital signal to produce a passband in-phase component; and (d) altering the passband quadrature and passband in-phase components based on at least one predetermined pattern to provide a baseband quadrature signal and a baseband in-phase signal.

Claim 27

Independent Claim 77 words

A method for down-converting a signal, the method comprising the steps of: (a) sampling an intermediate frequency signal at a sampling rate to produce a digital signal; (b) transforming the digital signal to produce a passband quadrature component; (c) delaying the digital signal to produce a passband in-phase component; and (d) altering the passband quadrature and passband in-phase components based on at least one predetermined pattern to provide a baseband quadrature signal and a baseband in-phase signal.

Claim 28

Dependent Claim 36 words

A method according to claim 23, further comprising the step of: (e) alternately selecting the passband quadrature component and the passband in-phase component to provide selected components of the passband quadrature component and passband in-phase component.

Claim 29

Dependent Claim 29 words

A method according to claim 23, further comprising the step of: (e) decimating the digital signal before transforming and delaying the digital signal in said steps (b) and (c).

Claim 30

Dependent Claim 46 words

A method according to claim 23, wherein said step (d) comprises the substep of: (d1) pseudorandom sequence demodulating the passband quadrature and passband in-phase components based on both the predetermined pattern and a pseudorandom sequence to provide the baseband quadrature signal and the baseband in-phase signal.

Claim 31

Dependent Claim 116 words

A method according to claim 26, wherein said step (d) further comprises the substeps of: (d2) early pseudorandom sequence demodulating the passband quadrature and passband in-phase components based on both the predetermined pattern and an early pseudorandom sequence to provide an early baseband quadrature signal and an early baseband in-phase signal; (d3) late pseudorandom sequence demodulating the passband quadrature and passband in-phase components based on both the predetermined pattern and a late pseudorandom sequence to provide a late baseband quadrature signal and a late baseband in-phase signal; and (d4) selecting the baseband quadrature signal and the baseband in-phase signal from one of said steps (d1), (d2) or (d3) based on a quality of the selected signals.

Claim 32

Dependent Claim 41 words

A method according to claim 23, wherein said step (a) comprises the substep of: (a1) sampling the intermediate frequency signal, at a sampling rate an integral multiple of an intermediate frequency of the intermediate frequency signal, to produce the digital signal.

Claim 33

Dependent Claim 44 words

A method according to claim 23, wherein said step (d) comprises the substep of: (d1) changing a sign of the passband quadrature and passband in-phase components based on at least one predetermined pattern to provide a baseband quadrature signal and a baseband in-phase signal

Claim 34

Dependent Claim 29 words

A method according to claim 23, further comprising the step of: (e) performing DC estimation to substantially eliminate DC from the baseband quadrature signal and the baseband in-phase signal.

Claim 35

Dependent Claim 106 words

A method according to claim 30, wherein said step (e) further comprises the steps of: (e1) delaying the baseband quadrature component; (e2) adding a first DC estimate value to the quadrature baseband component delayed in said step (e1); (e3) delaying the in-phase quadrature component; (e4) adding a second DC estimate value to the in-phase baseband component delayed in said step (e3); (e5) DC estimation filtering the baseband quadrature component from the altering in said step (d) to provide the first DC estimate value; and (e6) DC estimation filtering the baseband in-phase component from the altering in said step (d) to provide the second DC estimate value.

Claim 36

Dependent Claim 118 words

A method according to claim 30, wherein said step (e) further comprises the steps of: (e1) delaying the baseband quadrature component; (e2) adding a first DC estimate value to the quadrature baseband component delayed in said step (e1); (e3) delaying the in-phase quadrature component; (e4) adding a second DC estimate value to the in-phase baseband component delayed in said step (e3); (e5) selecting the digital signal after said step (a) to provide first and second digital signals; (e6) DC estimation filtering the first digital signal selected in said step (e5) to provide the first DC estimate value; and (e7) DC estimation filtering the second digital signal selected in said step (e5) to provide the second DC estimate value.

Claim 37

Dependent Claim 107 words

A downconverter, comprising: an analog-to-digital converter operatively coupled to receive an intermediate frequency signal and to provide a digital signal at a sampling rate; a Hilbert transformation network operatively coupled to said analog-to-digital converter to provide a passband quadrature component of the digital signal; a delay element operatively coupled to said analog-to-digital converter to provide a passband in-phase component of the digital signal; and a digital translator operatively coupled to said Hilbert transformation network and said delay element to alter the passband quadrature and passband in-phase components based on at least one time variant predetermined pattern to provide a baseband quadrature signal and a baseband in-phase signal.

Claim 38

Dependent Claim 107 words

A downconverter, comprising: an analog-to-digital converter operatively coupled to receive an intermediate frequency signal and to provide a digital signal at a sampling rate; a Hilbert transformation network operatively coupled to said analog-to-digital converter to provide a passband quadrature component of the digital signal; a delay element operatively coupled to said analog-to-digital converter to provide a passband in-phase component of the digital signal; and a digital translator operatively coupled to said Hilbert transformation network and said delay element to alter the passband quadrature and passband in-phase components based on at least one time variant predetermined pattern to provide a baseband quadrature signal and a baseband in-phase signal.

Claim 39

Dependent Claim 50 words

A downconverter according to claim 33, further comprising a selector operatively coupled to said Hilbert transformation network and said delay element to alternately select the passband quadrature component and the passband in-phase component to provide selected components of the passband quadrature component and passband in-phase component to said digital translator.

Claim 40

Dependent Claim 84 words

A downconverter according to claim 34, wherein said digital translator comprises: a quadrature translator operatively coupled to receive the selected passband quadrature components from said selector and to alter the selected passband quadrature components based on a first time variant predetermined pattern to provide the baseband quadrature signal; and an in-phase translator operatively coupled to receive the selected passband in-phase components from said selector to alter the passband in-phase components based on a second time variant predetermined pattern to provide the baseband in-phase signal.

Claim 41

Dependent Claim 35 words

A downconverter according to claim 33, further comprising a decimator operatively coupled to receive the digital signal from said analog-to-digital converter and alternately provide the digital signal to said transformation network and said delay element.

Claim 42

Dependent Claim 71 words

A downconverter according to claim 36, wherein said digital translator comprises: a quadrature translator operatively coupled to said Hilbert transformation network to alter the passband quadrature component based on a first time variant predetermined pattern to provide the baseband quadrature signal; and an in-phase translator operatively coupled to said delay element to alter the passband in-phase component based on a second time variant predetermined pattern to provide the baseband in-phase signal.

Claim 43

Dependent Claim 58 words

A downconverter according to claim 33, wherein said digital translator further comprises a pseudorandom sequence demodulator operatively coupled to said transformation network and said delay element to alter the passband quadrature and passband in-phase components based on both the time variant predetermined pattern and a pseudorandom sequence to provide the baseband quadrature signal and the baseband in-phase signal.

Claim 44

Dependent Claim 138 words

A downconverter according to claim 33, further comprising: an early translator operatively coupled to said Hilbert transformation network and said delay element to alter the passband quadrature and passband inphase components based on a time variant predetermined pattern to provide an early baseband quadrature signal and an early baseband in-phase signal; a late translator operatively coupled to said Hilbert transformation network and said delay element to alter the passband quadrature and passband in-phase components based on a time variant predetermined pattern to provide a late baseband quadrature signal and a late baseband in-phase signal; and a selector operatively coupled to said early translator, said late translator and said digital translator to select the baseband quadrature signal and the baseband in-phase signal from one of said early, late and digital translators based on a quality of the selected signals.

Claim 45

Dependent Claim 32 words

A downconverter according to claim 33, wherein the components consist of binary numbers and wherein said digital translator changes a sign of the binary numbers according to the time variant predetermined pattern.

Claim 46

Dependent Claim 84 words

A CDMA receiver, comprising: analog-to-digital converting means for sampling an IF signal at a sampling rate to provide a digital signal; transformation means for transforming the digital signal to provide a passband quadrature component of the digital signal and a passband in-phase component of the digital signal; and translator means for altering and despreading the passband quadrature and passband in-phase components based on both a time variant predetermined pattern and a pseudorandom sequence to provide a baseband quadrature signal and a baseband in-phase signal.

Claim 47

Dependent Claim 84 words

A CDMA receiver, comprising: analog-to-digital converting means for sampling an IF signal at a sampling rate to provide a digital signal; transformation means for transforming the digital signal to provide a passband quadrature component of the digital signal and a passband in-phase component of the digital signal; and translator means for altering and despreading the passband quadrature and passband in-phase components based on both a time variant predetermined pattern and a pseudorandom sequence to provide a baseband quadrature signal and a baseband in-phase signal.

Claim 48

Independent Claim 79 words

A method for down-converting a signal, the method comprising the steps of: (a) sampling an intermediate frequency signal at a sampling rate to produce a digital signal; (b) transforming the digital signal to produce a passband quadrature component; (c) delaying the digital signal to produce a passband in-phase component; and (d) altering the passband quadrature and passband in-phase components based on at least one time variant predetermined pattern to provide a baseband quadrature signal and a baseband in-phase signal.

Claim 49

Independent Claim 79 words

A method for down-converting a signal, the method comprising the steps of: (a) sampling an intermediate frequency signal at a sampling rate to produce a digital signal; (b) transforming the digital signal to produce a passband quadrature component; (c) delaying the digital signal to produce a passband in-phase component; and (d) altering the passband quadrature and passband in-phase components based on at least one time variant predetermined pattern to provide a baseband quadrature signal and a baseband in-phase signal.

Claim 50

Dependent Claim 36 words

A method according to claim 42, further comprising the step of: (e) alternately selecting the passband quadrature component and the passband in-phase component to provide selected components of the passband quadrature component and passband in-phase component.

Claim 51

Dependent Claim 29 words

A method according to claim 42, further comprising the step of: (e) decimating the digital signal before transforming and delaying the digital signal in said steps (b) and (c).

Claim 52

Dependent Claim 48 words

A method according to claim 42, wherein said step (d) comprises the substep of: (d1) pseudorandom sequence demodulating the passband quadrature and passband in-phase components based on both the time variant predetermined pattern and a pseudorandom sequence to provide the baseband quadrature signal and the baseband in-phase signal.

Claim 53

Dependent Claim 120 words

A method according to claim 45, wherein said step (d) further comprises the substeps of: (d2) early pseudorandom sequence demodulating the passband quadrature and passband in-phase components based on both the time variant predetermined pattern and an early pseudorandom sequence to provide an early baseband quadrature signal and an early baseband in-phase signal; (d3) late pseudorandom sequence demodulating the passband quadrature and passband in-phase components based on both the time variant predetermined pattern and a late pseudorandom sequence to provide a late baseband quadrature signal and a late baseband in-phase signal; and (d4) selecting the baseband quadrature signal and the baseband in-phase signal from one of said steps (d1), (d2) or (d3) based on a quality of the selected signals.

Claim 54

Dependent Claim 41 words

A method according to claim 42, wherein said step (a) comprises the substep of: (a1) sampling the intermediate frequency signal, at a sampling rate an integral multiple of an intermediate frequency of the intermediate frequency signal, to produce the digital signal.

Claim 55

Dependent Claim 46 words

A method according to claim 42, wherein said step (d) comprises the substep of: (d1) changing a sign of the passband ,quadrature and passband in-phase components based on at least one time variant predetermined pattern to provide a baseband quadrature signal and a baseband in-phase signal.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1998-06-05	1998-12-05	1999-06-06	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2002-06-05	2002-12-05	2003-06-06	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2006-06-05	2006-12-05	2007-06-06	$7700.00	Window Closed / Lapsed

Method and apparatus for multi-phase component downconversion

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