POLAR MODULATION TRANSMITTER, ADAPTIVE DISTORTION COMPENSATION PROCESSING SYSTEM, POLAR MODULATION TRANSMISSION METHOD, AND ADAPTIVE DISTORTION COMPENSATION PROCESSING METHOD

• US 20100222015A1
• Filed: 12/26/2006
• Published: 09/02/2010
• Est. Priority Date: 12/27/2005
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Urushihara, Tomoya, Shimizu, Yoshito
• Granted Patent: US 8,050,637 B2
• Time in Patent Office: Days
• US Class Current: 455/102
• CPC Class Codes: H03F 1/02 Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
• CPC Class Codes: H03F 1/3223 using feed-forward H03F1/3211 takes precedence
• CPC Class Codes: H03F 1/3229 using a loop for error extraction and another loop for error subtraction
• CPC Class Codes: H03F 1/3241 using predistortion circuits H03F1/3211, H03F1/3217 take precedence
• CPC Class Codes: H03F 2200/468 the temperature being sensed
• CPC Class Codes: H03F 2201/3212 Using a control circuit to adjust amplitude and phase of a signal in a signal path
• CPC Class Codes: H03F 3/24 of transmitter output stages
• CPC Class Codes: H04B 1/0475 with means for limiting noise, interference or distortion H04B1/0483 takes precedence
• CPC Class Codes: H04B 2001/0425 with linearisation using predistortion

Abstract

An object of the invention is to provide a polar modulation transmitter that can perform adaptive distortion compensation processing without the need for a synchronization adjustment circuit for synchronizing an input baseband signal and an output signal of a power amplifier. An adaptive operation control section 1501 measures the unbalance amount of an output spectrum of a power amplifier 1 and a coefficient adjustment determination section of the adaptive operation control section 1501 performs iteration control so that if the unbalance amount is equal to or greater than a predetermined threshold value, coefficient information output to a distortion compensation processing circuit 1301 is adjusted and an adjustment is made to distortion compensation processing in the distortion compensation processing circuit 1301 and if the unbalance amount is less than the predetermined threshold value, the coefficient information is maintained, whereby the characteristic change of the power amplifier 1 at the environmental temperature change time can be adaptively compensated for without using a synchronization adjustment circuit for synchronizing an input baseband signal and an output signal from the power amplifier 1.

Claims

1. A polar modulation transmitter comprising:

a polar modulation section that generates an amplitude signal from a baseband orthogonal signal generated based on transmission data;

an amplitude modulation section that generates an amplitude modulation signal based on the amplitude signal;

a phase modulation section that generates a phase modulation signal in a wireless frequency band based on a signal having at least a phase component of the baseband orthogonal signal;

an amplifier that generates transmission data in the wireless frequency band by inputting the phase modulation signal as an input high frequency signal and inputting the amplitude modulation signal as a control signal;

a detection section that calculates out of band power in two frequency bands of predetermined same detuning frequencies from the center frequency of the output signal of the amplifier; and

a distortion compensation processing section that includes;

a predistortion compensation section which stores distortion compensation processing data and executes predetermined distortion compensation processing based on the distortion compensation processing data for at least one of an input signal to the amplitude modulation section and an input signal to the phase modulation section using the amplitude signal as a reference signal; and

a distortion compensation adjustment section which compensates a transient response characteristic of the output signal from the amplifier at the control voltage driving time based on the control signal, by executing a distortion adjustment to a signal output from the predistortion compensation section or the reference signal based on output of the detection section,

wherein the predistortion distortion compensation section has a steady characteristic compensation circuit for linearizing the output signal of said amplifier in a steady state based on the output signal characteristic for a control voltage value in the steady state after a predetermined control voltage is input when a predetermined input high frequency signal amplitude is input.

2. The polar modulation transmitter according to claim 1, wherein the predistortion compensation section further includes a delay adjustment section which applies a predetermined delay amount to at least one of the amplitude signal and the signal having the phase component to ensure synchronization between the amplitude signal and the signal having the phase component;

and

wherein the distortion compensation processing section executes distortion adjustment in at least one of the distortion compensation adjustment section and the delay adjustment section based on the output of the detection section.

3. The polar modulation transmitter according to claim 1, wherein the distortion compensation adjustment section controls the adjustment amount for the distortion compensation processing based on plus or minus of the difference between the relative difference of the out of band power and a predetermined threshold value.

4. The polar modulation transmitter according to claim 3, further comprising:

a distortion compensation adjustment determination section that switches between execution and non-execution of the adjustment of the distortion compensation adjustment section.

5. The polar modulation transmitter according to claim 3,

wherein the distortion compensation adjustment section has a first amplitude information adjustment section for adjusting the amplitude of the amplitude signal after execution of distortion compensation processing in the steady state characteristic compensation circuit.

6. The polar modulation transmitter according to claim 5, wherein the first amplitude information adjustment section has a multiplication circuit for multiplying the amplitude of the amplitude signal after execution of the distortion compensation processing in the steady state characteristic compensation circuit by a predetermined coefficient.

7. The polar modulation transmitter according to claim 3,

wherein the distortion compensation adjustment section has a second amplitude information adjustment section for adjusting the value of a reference address signal when the steady state characteristic compensation circuit executes distortion compensation processing of the amplitude signal.

8. The polar modulation transmitter according to claim 7, wherein the second amplitude information adjustment section has a multiplication circuit for multiplying the value of the reference address signal when the steady state characteristic compensation circuit executes distortion compensation processing of the amplitude signal by a predetermined coefficient.

9. The polar modulation transmitter according to claim 3, wherein the polar modulation section generates a phase signal from the baseband orthogonal signal and outputs the phase signal to the distortion compensation processing section;

wherein the predistortion compensation section performs distortion compensation processing for the phase signal and outputs the signal to the phase modulation section; and

wherein the distortion compensation adjustment section has a second amplitude information adjustment section for adjusting the value of a reference address signal when the steady state characteristic compensation circuit executes distortion compensation processing of the phase signal.

10. The polar modulation transmitter according to claim 9, wherein the second amplitude information adjustment section has a multiplication circuit for multiplying the value of the reference address signal when the steady state characteristic compensation circuit executes distortion compensation processing of the phase signal by a predetermined coefficient.

11. The polar modulation transmitter according to claim 3, wherein the predistortion compensation section has a steady state characteristic compensation circuit for linearizing the output signal of the amplifier in a steady state based on the output signal characteristic for a control voltage value in the steady state after a predetermined control voltage is input when a predetermined input high frequency signal amplitude is input;

and

wherein the distortion compensation adjustment section has a phase compensation circuit for adjusting the amplitude of the signal having a phase component and adjusting the input high frequency signal amplitude to the amplifier.

12. The polar modulation transmitter according to claim 11, wherein the phase compensation circuit has a variable attenuation circuit or a variable gain amplifier provided between the phase modulation section and the amplifier.

13. An adaptive distortion compensation processing system, comprising:

a mobile station wireless communication apparatus having a distortion compensation processing circuit; and

a base station wireless communication apparatus,

wherein the base station wireless communication apparatus includes;

a first antenna;

a base station transceiver which transmits and receives data to and from the mobile station wireless communication apparatus through the first antenna;

a detection section that branches a signal output from the first antenna at the reception operation time of the base station wireless communication apparatus and calculates out of band power in two frequency bands of predetermined same detuning frequencies from the center frequency of the branch signal; and

a conversion section which converts relative difference information of the out of band power into transmission data from the base station transceiver to control compensation data relevant to a transmitter of the mobile station wireless communication apparatus.

14. The adaptive distortion compensation processing system according to claim 13, wherein the mobile station wireless communication apparatus includes:

a polar modulation transmitter having;

a polar modulation section which generates an amplitude signal from a baseband orthogonal signal generated based on transmission data;

an amplitude modulation section which generates an amplitude modulation signal based on the amplitude signal;

a phase modulation section which generates a phase modulation signal in a wireless frequency band based on a signal having at least a phase component of the baseband orthogonal signal; and

a distortion compensation processing section which has;

an amplifier for generating transmission data in the wireless frequency band by inputting the phase modulation signal as an input high frequency signal and inputting the amplitude modulation signal as a control signal;

a predistortion compensation section for storing predetermined distortion compensation processing data and performing predetermined distortion compensation processing based on the distortion compensation processing data for at least one of an input signal to the amplitude modulation section and an input signal to the phase modulation section using the amplitude signal as a reference signal; and

a distortion compensation adjustment section for performing a distortion adjustment to a signal output from the predistortion compensation section or the reference signal; and

a second antenna,

wherein the distortion compensation adjustment section reconstructs the relative difference information of the out of band power converted into the transmission signal by the conversion section from a reception signal from the second antenna and executes the distortion adjustment based on the relative difference information.

15. The adaptive distortion compensation processing system according to claim 13, wherein in the mobile station wireless communication apparatus, the predistortion compensation section further includes a delay adjustment section for giving a predetermined delay amount to at least one of the amplitude signal and the signal having a phase component and ensuring synchronization between the amplitude signal and the signal having a phase component;

and

wherein the distortion compensation adjustment section reconstructs the relative difference information of the out of band power converted into the transmission signal by the conversion section from a reception signal from the second antenna and executes the adjustment in at least one of the distortion compensation adjustment section and the delay adjustment section based on the relative difference information.

16. The adaptive distortion compensation processing system according to claim 13, wherein the conversion section converts the relative difference information into code information and absolute value information converted into a discrete value at a predetermined interval.

17. The adaptive distortion compensation processing system according to claim 14, further comprising:

a distortion compensation adjustment determination section that switches between execution and non-execution of the adjustment of the distortion compensation adjustment section based on plus or minus of the difference between the relative difference information and a predetermined threshold value.

18. The adaptive distortion compensation processing system according to claim 14, wherein the predistortion compensation section has a steady state characteristic compensation circuit for linearizing the output signal of the amplifier in a steady state based on the output signal characteristic for a control voltage value in the steady state after a predetermined control voltage is input when a predetermined input high frequency signal amplitude is input;

and

wherein the distortion compensation adjustment section has a first amplitude information adjustment section for adjusting the amplitude of the amplitude signal after execution of distortion compensation processing in the steady state characteristic compensation circuit and compensating for a transient response characteristic of the output signal from the amplifier at the control voltage driving time.

19. The adaptive distortion compensation processing system according to claim 18, wherein the first amplitude information adjustment section has a multiplication circuit for multiplying the amplitude of the amplitude signal after execution of the distortion compensation processing in the steady state characteristic compensation circuit by a predetermined coefficient.

20. The adaptive distortion compensation processing system according to claim 14, wherein the predistortion compensation section has a steady state characteristic compensation circuit for linearizing the output signal of the amplifier in a steady state based on the output signal characteristic for a control voltage value in the steady state after a predetermined control voltage is input when a predetermined input high frequency signal amplitude is input;

and

wherein the distortion compensation adjustment section has a second amplitude information adjustment section for adjusting the value of a reference address signal when the steady state characteristic compensation circuit executes distortion compensation processing of the amplitude signal and compensating for a transient response characteristic of the output signal from the amplifier at the control voltage driving time.

21. The adaptive distortion compensation processing system according to claim 20, wherein the second amplitude information adjustment section has a multiplication circuit for multiplying the value of the reference address signal when the steady state characteristic compensation circuit executes distortion compensation processing of the amplitude signal by a predetermined coefficient.

22. The adaptive distortion compensation processing system according to claim 14, wherein the polar modulation section generates a phase signal from the baseband orthogonal signal and outputs the phase signal to the distortion compensation processing section;

wherein the distortion compensation processing section performs distortion compensation processing for the phase signal and outputs the signal to the phase modulation section;

wherein the predistortion compensation section has a steady state characteristic compensation circuit for linearizing the output signal of the amplifier in a steady state based on the output signal characteristic for a control voltage value in the steady state after a predetermined control voltage is input when a predetermined input high frequency signal amplitude is input; and

wherein the distortion compensation adjustment section has a second amplitude information adjustment section for adjusting the value of a reference address signal when the steady state characteristic compensation circuit executes distortion compensation processing of the phase signal and compensating for a transient response characteristic of the output signal from the amplifier at the control voltage driving time.

23. The adaptive distortion compensation processing system according to claim 22, wherein the second amplitude information adjustment section has a multiplication circuit for multiplying the value of the reference address signal when the steady state characteristic compensation circuit executes distortion compensation processing of the phase signal by a predetermined coefficient.

24. The adaptive distortion compensation processing system according to claim 14, wherein the predistortion compensation section has a steady state characteristic compensation circuit for linearizing the output signal of the amplifier in a steady state based on the output signal characteristic for a control voltage value in the steady state after a predetermined control voltage is input when a predetermined input high frequency signal amplitude is input;

and

wherein the distortion compensation adjustment section has a phase compensation circuit for adjusting the amplitude of the signal having a phase component and adjusting the input high frequency signal amplitude to the amplifier.

25. The adaptive distortion compensation processing system according to claim 24, wherein the phase compensation circuit has a variable attenuation circuit or a variable gain amplifier provided between the phase modulation section and the amplifier.

26. A polar modulation transmitter, comprising:

a polar modulation section that generates an amplitude signal from a baseband orthogonal signal generated based on transmission data;

an amplitude modulation section that generates an amplitude modulation signal based on the amplitude signal;

a phase modulation section that generates a phase modulation signal in a wireless frequency band based on a signal having at least a phase component of the baseband orthogonal signal;

an amplifier that generates transmission data in the wireless frequency band by inputting the phase modulation signal as an input high frequency signal and inputting the amplitude modulation signal as a control signal; and

a distortion compensation processing section that includes a predistortion compensation section which stores predetermined distortion compensation processing data to perform predetermined distortion compensation processing based on the distortion compensation processing data for at least one of an input signal to the amplitude modulation section and an input signal to the phase modulation section using the amplitude signal as a reference signal and a distortion compensation adjustment section for compensates a transient response characteristic of the output signal from the amplifier at the control voltage driving time based on the control signal by executing a distortion adjustment to a signal output from the predistortion compensation section or the reference signal based on modulation,

wherein the predistortion distortion compensation section has a steady characteristic compensation circuit for linearizing the output signal of said amplifier in a steady state based on the output signal characteristic for a control voltage value in the steady state after a predetermined control voltage is input when a predetermined input high frequency signal amplitude is input.

27. A polar modulation transmitter, comprising:

a polar modulation section that generates an amplitude signal from a baseband orthogonal signal generated based on transmission data;

an amplitude modulation section that generates an amplitude modulation signal based on the amplitude signal;

a phase modulation section that generates a phase modulation signal in a wireless frequency band based on a signal having at least a phase component of the baseband orthogonal signal;

an amplifier that generates transmission data in the wireless frequency band by inputting the phase modulation signal as an input high frequency signal and inputting the amplitude modulation signal as a control signal; and

a distortion compensation processing section that includes a predistortion compensation section which stores predetermined distortion compensation processing data to perform predetermined distortion compensation processing based on the distortion compensation processing data for at least one of an input signal to the amplitude modulation section and an input signal to the phase modulation section using the amplitude signal as a reference signal and a distortion compensation adjustment section for executing a distortion adjustment to a signal output from the predistortion compensation section or the reference signal,

wherein the predistortion compensation section has a steady state characteristic compensation circuit for linearizing the output signal of the amplifier in a steady state based on the output signal characteristic for a control voltage value in the steady state after a predetermined control voltage is input when a predetermined input high frequency signal amplitude is input;

wherein the distortion compensation adjustment section has a first amplitude information adjustment section for adjusting the amplitude of the amplitude signal after execution of distortion compensation processing in the steady state characteristic compensation circuit and compensating for a transient response characteristic of the output signal from the amplifier at the control voltage driving time; and

wherein the first amplitude information adjustment section is a multiplying digital-analog conversion circuit.

28. The polar modulation transmitter according to claim 27, wherein the distortion compensation adjustment section adjusts a reference potential of the multiplying digital-analog conversion circuit in response to an environmental temperature.

29. The polar modulation transmitter according to claim 27, further comprising:

a detection section that calculates out of band power in two frequency bands of predetermined same detuning frequencies from the center frequency of the output signal of the amplifier.

30. The polar modulation transmitter according to claim 29, wherein the distortion compensation adjustment section adjusts the reference potential of the multiplying digital-analog conversion circuit based on plus or minus of the difference between the relative difference of the out of band power and a predetermined threshold value.

31. The polar modulation transmitter according to claim 30, further comprising:

a distortion compensation adjustment determination section that switches between execution and non-execution of the adjustment of the reference potential of the multiplying digital-analog conversion circuit in the distortion compensation adjustment section.

32. (canceled)

33. A polar modulation transmission method comprising:

generating an amplitude signal from a baseband orthogonal signal generated based on transmission data;

generating an amplitude modulation signal based on the amplitude signal by an amplitude modulation section;

generating a phase modulation signal in a wireless frequency band based on a signal having at least a phase component of the baseband orthogonal signal by a phase modulation section;

generating transmission data in the wireless frequency band by an amplifier by inputting the phase modulation signal as an input high frequency signal and inputting the amplitude modulation signal as a control signal;

calculating out of band power in two frequency bands of predetermined same detuning frequencies from the center frequency of the output signal of the amplifier by a detection section;

performing predetermined distortion compensation processing by a predistortion compensation section storing predetermined distortion compensation processing data based on the distortion compensation processing data for at least one of an input signal to the amplitude modulation section and an input signal to the phase modulation section using the amplitude signal as a reference signal; and

compensating a transient response characteristic of the output signal from the amplifier at the control voltage driving time based on the control signal by executing a distortion adjustment to a signal output from the predistortion compensation section or the reference signal based on output of the detection section,

wherein the predistortion distortion compensation section has a steady characteristic compensation circuit for linearizing the output signal of said amplifier in a steady state based on the output signal characteristic for a control voltage value in the steady state after a predetermined control voltage is input when a predetermined input high frequency signal amplitude is input.

34. An adaptive distortion compensation processing method of an adaptive distortion compensation processing system including a mobile station wireless communication apparatus having a distortion compensation processing circuit and a base station wireless communication apparatus, the adaptive distortion compensation processing method comprising:

transmitting and receiving data in the base station wireless communication apparatus to and from the mobile station wireless communication apparatus;

branching a signal output from the first antenna at the reception operation time of the base station wireless communication apparatus and calculating out of band power in two frequency bands of predetermined same detuning frequencies from the center frequency of the branch signal; and

converting relative difference information of the out of band power into transmission data from the base station transceiver to control compensation data relevant to a transmitter of the mobile station wireless communication apparatus.

35. A polar modulation transmission method comprising:

generating an amplitude signal from a baseband orthogonal signal generated based on transmission data;

generating an amplitude modulation signal based on the amplitude signal by an amplitude modulation section;

generating a phase modulation signal in a wireless frequency band based on a signal having at least a phase component of the baseband orthogonal signal by a phase modulation section;

generating transmission data in the wireless frequency band by an amplifier by inputting the phase modulation signal as an input high frequency signal and inputting the amplitude modulation signal as a control signal;

performing predetermined distortion compensation processing by a predistortion compensation section storing predetermined distortion compensation processing data based on the distortion compensation processing data for at least one of an input signal to the amplitude modulation section and an input signal to the phase modulation section using the amplitude signal as a reference signal; and

compensating a transient response characteristic of the output signal from the amplifier at the control voltage driving time based on the control signal by executing a distortion adjustment to a signal output from the predistortion compensation section or the reference signal based on modulation speed,

wherein the predistortion distortion compensation section has a steady characteristic compensation circuit for linearizing the output signal of said amplifier in a steady state based on the output signal characteristic for a control voltage value in the steady state after a predetermined control voltage is input when a predetermined input high frequency signal amplitude is input.

36. A polar modulation transmission method comprising:

generating an amplitude signal from a baseband orthogonal signal generated based on transmission data;

generating an amplitude modulation signal based on the amplitude signal by an amplitude modulation section;

generating a phase modulation signal in a wireless frequency band based on a signal having at least a phase component of the baseband orthogonal signal by a phase modulation section;

generating transmission data in the wireless frequency band by an amplifier by inputting the phase modulation signal as an input high frequency signal and inputting the amplitude modulation signal as a control signal;

performing predetermined distortion compensation processing by a predistortion compensation section storing predetermined distortion compensation processing data based on the distortion compensation processing data for at least one of an input signal to the amplitude modulation section and an input signal to the phase modulation section using the amplitude signal as a reference signal; and

executing a distortion adjustment to a signal output from the predistortion compensation section or the reference signal by the distortion compensation adjustment section,

wherein the process of performing the distortion compensation processing by the predistortion compensation section has a process of linearizing the output signal of the amplifier in a steady state by a steady state characteristic compensation circuit based on the output signal characteristic for a control voltage value in the steady state after a predetermined control voltage is input when a predetermined input high frequency signal amplitude is input; and

wherein the process of executing the adjustment by the distortion compensation adjustment section has a process of adjusting the amplitude of the amplitude signal after execution of distortion compensation processing in the steady state characteristic compensation circuit and compensating for a transient response characteristic of the output signal from the amplifier at the control voltage driving time by a multiplying digital-analog conversion circuit.