Non-linear distortion compensation circuit, transmitter device to be employed in the same and mobile communication unit

• US 6,741,867 B1
• Filed: 11/17/2000
• Issued: 05/25/2004
• Est. Priority Date: 11/30/1999
• Status: Expired due to Fees

• Current Assignee: Lenovo Innovations Ltd Hong Kong (Lenovo Group Ltd.)
• Original Assignee: NEC Corporation
• Inventors: Tetsuya, Takaki
• Primary Examiner(s): Maung, Nay
• Assistant Examiner(s): Gantt, Alan T.
• Application Number:
  US09/714,433
• Time in Patent Office: 1,285 Days
• Field of Search: 455/522, 455/127.1, 455/127.2, 455/126, 455/114.3, 375/296, 375/297, 370/320, 370/335, 370/342
• US Class Current: 455/522
• CPC Class Codes: H03F 1/3247 using feedback acting on predistortion circuits H03F1/3264 takes precedence
• CPC Class Codes: H03F 1/3288 to compensate phase shift as a function of the amplitude
• CPC Class Codes: H03F 1/3294 Acting on the real and imaginary components of the input signal
• CPC Class Codes: H03F 2201/3233 Adaptive predistortion using lookup table, e.g. memory, RAM, ROM, LUT, to generate the predistortion

Abstract

A non-linear distortion compensation circuit, a transmission equipment employing the same and a mobile transmission equipment may accurately compensate distortion caused by non-linearity of a transmitter per bit (symbol) even while the base station is performing transmission power control for the transmitter of the mobile station. The non-linear distortion compensation circuit in a transmission equipment controls a transmission power depending upon an external transmission power control information upon transmission of a digital signal. The non-linear compensation circuit has compensation component generating means for generating a compensation component for a non-linear distortion depending upon a transmission power per bit of the digital signal and the transmission power control information, and compensating means for compensating the non-linear distortion of the transmission signal by the compensation component.

Claims

1. A non-linear distortion compensation circuit in a transmission equipment for controlling a transmission power depending upon an external transmission power control information upon transmission of a digital signal, comprising:

compensation component generating means for generating a compensation component for a non-linear distortion depending upon a transmission power per bit of said digital signal and said external transmission power control information; and

compensating means for compensating said non-linear distortion of the transmission signal by said compensation component,

wherein said transmission signal is a time slot type, said external transmission power control information is set for controlling the transmission power per transmission time slot, said address generating means derives said transmission power per bit by addition of an average power value of a transmission time slot at a certain timing and an instantaneous power value per each bit of subsequent transmission time slot.

2. A non-linear distortion compensation circuit as set forth in claim 1, wherein said compensation component generating means generates said compensation component per bit, and said compensation means performs compensation of said non-linear distortion according to the compensation component per bit.

3. A non-linear distortion compensation circuit as set forth in claim 2, wherein said compensation component generating means calculates the transmission power per bit on the basis of an instantaneous transmission power value and an average value of the transmission power, and generates the compensation component per bit according to the result of calculation and said transmission power control information.

4. A non-linear distortion compensation circuit as set forth in claim 1, wherein said compensation component generating means comprises storage means for preliminarily storing a compensation data as said compensation component and address generating means for generating an address of said storage means on the basis of the transmission power per bit and said transmission power control information.

5. A non-linear distortion compensation circuit as set forth in claim 4, wherein said address generating means is constructed to generate said address by addition of said transmission power per bit and said transmission power control information.

6. A non-linear distortion compensation circuit as set forth in claim 5, wherein said address generating means derives the transmission power per bit by addition of an instantaneous transmission power and an average value of the transmission power.

7. A non-linear distortion compensation circuit as set forth in claim 1, wherein said transmission power control information is information for transmission power control for subsequent transmission time slot.

8. A non-linear distortion compensation circuit as set forth in claim 4, wherein said storage means is a read-only memory.

9. A transmission equipment comprising:

a transmitter including component which causing nonlinear distortion;

a non-linear distortion compensation circuit in a transmission equipment for controlling a transmission power depending upon an external transmission power control information upon transmission of a digital signal, including compensation component generating means for generating a compensation component for a non-linear distortion depending upon a transmission power per bit of said digital signal and said external transmission power control information, and compensating means for compensating said non-linear distortion of the transmission signal by said compensation component,

wherein said transmission signal is a time slot type, said external transmission power control information is set for controlling the transmission power per transmission time slot, said address generating means derives said transmission power per bit by addition of an average power value of a transmission time slot at a certain timing and an instantaneous power value per each bit of subsequent transmission time slot.

10. A transmission equipment as set forth in claim 9, wherein said compensation component generating means generates said compensation component per bit, and said compensation means performs compensation of said non-linear distortion according to the compensation component per bit.

11. A transmission equipment as set forth in claim 10, wherein said compensation component generating means calculates the transmission power per bit on the basis of an instantaneous transmission power value and an average value of the transmission power, and generates the compensation component per bit according to the result of calculation and said transmission power control information.

12. A transmission equipment as set forth in claim 9, wherein said compensation component generating means comprises storage means for preliminarily storing a compensation data as said compensation component and address generating means for generating an address of said storage means on the basis of the transmission power per bit and said transmission power control information.

13. A transmission equipment as set forth in claim 12, wherein said address generating means is constructed to generate said address by addition of said transmission power per bit and said transmission power control information.

14. A transmission equipment as set forth in claim 13, wherein said address generating means derives the transmission power per bit is calculated by addition of an instantaneous transmission power and an average value of the transmission power.

15. A transmission equipment as set forth in claim 9, wherein said transmission power control information is information for transmission power control for subsequent transmission time slot.

16. A mobile communication equipment comprising:

a receiver receiving a signal from a communication counterpart, said signal containing a transmission power control information;

a transmission equipment comprising a transmitter including component which causing non-linear distortion, a non-linear distortion compensation circuit in a transmission equipment for controlling a transmission power depending upon said transmission power control information upon transmission of a digital signal, including compensation component generating means for generating a compensation component for a non-linear distortion depending upon a transmission power per bit of said digital signal and said transmission power control information, and compensating means for compensating said non-linear distortion of the transmission signal by said compensation component,

wherein said transmission power control signal is respectively superimposed per time slot of the signal transmitted from the base station.

17. A mobile communication equipment as set forth in claim 16, wherein said compensation component generating means generates said compensation component per bit, and said compensation means performs compensation of said non-linear distortion according to the compensation component per bit.

18. A mobile communication equipment as set forth in claim 17, wherein said compensation component generating means calculates the transmission power per bit on the basis of an instantaneous transmission power value and an average value of the transmission power, and generates the compensation component per bit according to the result of calculation and said transmission power control information.

19. A mobile communication equipment as set forth in claim 16, wherein said compensation component generating means comprises storage means for preliminarily storing a compensation data as said compensation component and address generating means for generating an address of said storage means on the basis of the transmission power per bit and said transmission power control information.

20. A mobile communication equipment as set forth in claim 19, wherein said address generating means is constructed to generate said address by addition of said transmission power per bit and said transmission power control information.

21. A mobile communication equipment as set forth in claim 20, wherein said address generating means derives the transmission power per bit by addition of an instantaneous transmission power and an average value of the transmission power.

22. A mobile communication equipment, comprising:

a receiver receiving a signal from a communication counterpart, said signal containing a transmission power control information;

a transmission equipment comprising a transmitter including component which causing non-linear distortion, a non-linear distortion compensation circuit in a transmission equipment for controlling a transmission power depending upon said transmission power control information upon transmission of a digital signal, including compensation component generating means for generating a compensation component for a non-linear distortion depending upon a transmission power per bit of said digital signal and said transmission power control information, and compensating means for compensating said non-linear distortion of the transmission signal by said compensation component,

wherein said compensation component generating means comprises storage means for preliminarily storing a compensation data as said compensation component and address generating means for generating an address of said storage means on the basis of the transmission power per bit and said transmission power control information,

wherein said address generating means is constructed to generate said address by addition of said transmission power per bit and said transmission power control information,

wherein said address generating means derives the transmission power per bit by addition of an instantaneous transmission power and an average value of the transmission power, and

wherein said transmission signal is a time slot type, said external transmission power control information is set for controlling the transmission power per transmission time slot, said address generating means derives said transmission power per bit by addition of an average power value of a transmission time slot at a certain timing and an instantaneous power value per each bit of subsequent transmission time slot.

23. A mobile communication equipment as set forth in claim 22, wherein said transmission power control information is information for transmission power control for subsequent transmission time slot.

24. A mobile communication equipment comprising:

a receiver configured to receive a signal from a communication counterpart, said signal containing a transmission power control information;

transmission equipment comprising;

a transmitter which includes a component that causes non-linear distortion of a signal-to-be-transmitted;

a non-linear distortion compensation circuit that is configured to control a transmission power of the signal-to-be-transmitted depending upon said transmission power control information upon transmission of a digital signal;

a compensation component generating unit configured to generate a compensation component for the component which causes the non-linear distortion, based upon a transmission power per bit of said digital signal and said transmission power control information; and

a compensating unit configured to compensate said non-linear distortion of said signal-to-be-transmitted based on said compensation component,

wherein said transmission signal is a time slot type, said external transmission power control information is set for controlling the transmission power per transmission time slot based on a reception time slot at a certain timing, said address generating means derives said transmission power per bit by addition of an average power value of a transmission time slot at the certain timing and an instantaneous power value per each bit of a subsequent transmission time slot.