Power control apparatus and power control method

• US 20020097810A1
• Filed: 06/27/2001
• Published: 07/25/2002
• Est. Priority Date: 01/22/2001
• Status: Abandoned Application

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Seki, Tetsuya
• Application Number:
  US09/894,175
• Publication Number:
  US 20020097810A1
• Time in Patent Office: Days
• US Class Current: 375/295
• CPC Class Codes: H04L 27/3809 Amplitude regulation arrangements
• CPC Class Codes: H04L 27/3854 using a non - coherent carrier, including systems with baseband correction for phase or frequency offset
• CPC Class Codes: H04W 52/58 Format of the TPC bits

Abstract

The present invention relates to a transmitting unit of a base station using CDMA system, where a power control apparatus is provided which comprises a power control section and a power correcting section. The power correcting section is composed of a mask signal correcting section for correcting power control information about transmission on the basis of mask signals to output the corrected power control information, a phase rotation correcting section for correcting the corrected power control information on the basis of a decision signal to input the resultant corrected amplitude value to the power control section, and a symbol arrangement information arithmetic section for outputting symbol arrangement information based on each of the mask signals to the mask signal correcting section and the phase rotation correcting section. With this configuration, it is possible to reduce or cut the circuit scale, thus promoting an increase in user capacity.

Claims

1. A power control apparatus comprising:

a power control section for controlling amplitude by correcting a symbol point arrangement of data on the basis of a correction amplitude value inputted from the external and for outputting data to be transmitted, produced by the amplitude control; and

a power correcting section for correcting an amplitude value of a symbol before phase rotation on the basis of a decision signal representative of need/non-need for correction of the symbol amplitude value before the phase rotation and a mask signal indicative of at least one of symbol point components being masked and for inputting the corrected amplitude value to said power control section.

2. A power control apparatus according to claim 1, wherein at least one of said power control section and said power correcting section receive data modulated through the use of a nine-point constellation forming said symbol point arrangement.

3. A power control apparatus according to claim 2, wherein said power correcting section is made to output the corrected amplitude value in units of 45 degree for each symbol.

4. A power control apparatus according to claim 1, wherein said power correcting section includes:

a mask signal correcting section for correcting power control information about transmission on the basis of said mask signal to output the corrected power control information; and

a phase rotation correcting section for correcting the corrected power control information outputted from said mask signal correcting section on the basis of said decision signal and for inputting the corrected amplitude value to said power control section.

5. A power control apparatus according to claim 4, wherein said mask signal correcting section includes:

an arithmetic section for performing predetermined arithmetic processing on said power control information to output the arithmetically processed power control information; and

a selecting section for outputting, as the corrected amplitude value, desired one of said power control information and the arithmetically processed power control information outputted from said arithmetic section.

6. A power control apparatus according to claim 5, wherein said phase rotation correcting section includes:

an arithmetic section for performing predetermined arithmetic processing on the corrected power control information to output the arithmetically processed corrected power control information; and

a selecting section for outputting, as the corrected amplitude value, desired one of the corrected power control information and the arithmetically processed corrected power control information outputted from said arithmetic section on the basis of said decision signal and said mask signal.

7. A power control apparatus according to claim 2, wherein said power correcting section includes:

an arithmetic section for performing predetermined arithmetic processing on said power control information to output the arithmetically processed power control information; and

a selecting section for outputting, as the corrected amplitude value, desired one of said power control information and the arithmetically processed power control information outputted from said arithmetic section on the basis of said decision signal and said mask signal.

8. A power control apparatus according to claim 5, wherein said arithmetic section is designed to output, as the arithmetically processed power control information, subtracted power control information obtained by subtracting a predetermined value from said power control information.

9. A power control apparatus according to claim 5, wherein said arithmetic section is made to output, as the arithmetically processed power control information, added power control information obtained by adding a predetermined value to said power control information.

10. A power control apparatus according to claim 5, further comprising a symbol arrangement information arithmetic section for outputting symbol arrangement information based on logic of said mask signal to said selecting section.

11. A power control apparatus according to claim 1, further comprising a transmission symbol power adjusting section for adjusting transmission symbol power on the basis of the corrected amplitude value outputted from said power correcting section.

14. A power control method according to claim 13, wherein said phase rotating step is made to use a nine-point constellation as the symbol point arrangement.

12. A power control apparatus comprising:

a power control section for conducting amplitude adjustment by adjusting s symbol point arrangement of data on the basis of an adjustment amplitude value inputted from the external and for outputting data to be transmitted, produced by the amplitude adjustment; and

a power adjusting section for adjusting an amplitude value of a symbol before phase shift on the basis of a decision signal representative of need/non-need for adjustment of the symbol amplitude value before the phase shift and a mask signal representative of a phase shifted position resulting from a symbol point component and for inputting the adjusted amplitude value to said power control section.

13. A power control method comprising:

a phase rotating step of phase-rotating data arranged at a symbol point through the use of a desired modulation method to output data to be transmitted;

a mask signal outputting step of outputting a mask signal representative of which at least one of symbol point components being masked;

an arithmetically processed power control information generating step of conducting predetermined arithmetic processing on power control information about transmission to generate corrected power control information;

selecting/outputting step of selectively outputting desired one of said power control information and the corrected power control information generated in said arithmetically processed power control information generating step on the basis of said mask signal outputted in said mask signal outputting step and a decision signal representative of need/non-need for correction of an amplitude value of a symbol before phase rotation; and

an amplitude controlling step of controlling an amplitude of data to be transmitted, outputted in said phase rotating step, on the basis of said power control information or the corrected power control information selectively outputted in said selecting/outputting step.

15. A power control method comprising:

a phase rotating step of phase-rotating data arranged at a symbol point through the use of a desired modulation method to output data to be transmitted;

a corrected power control information outputting step in which a power correcting section having a desired correction quantity for each of said symbol points corrects power control information on the basis of a decision signal representative of need/non-need of an amplitude value of said symbol before phase rotation to output the corrected power control information; and

an amplitude controlling step of controlling an amplitude of data to be transmitted, outputted in said phase rotating step on the basis of the corrected power control information outputted in said corrected power control information outputting step.

16. A power control method comprising:

a constellation correcting step of correcting data placed at each of symbol points through a desired modulation method on the basis of a mask signal representative of at least one of symbol point components being masked, for outputting the corrected data; and

a phase rotation correcting step of correcting the corrected data obtained in said constellation correcting step on the basis of a decision signal representative of need/non-need of an amplitude of said symbol before phase rotation for outputting total corrected data.