Variation compensating unit

• US 6,654,618 B2
• Filed: 03/01/2002
• Issued: 11/25/2003
• Est. Priority Date: 10/28/1999
• Status: Expired due to Term

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Kobayakawa, Shuji
• Primary Examiner(s): Le, Thanh Cong
• Assistant Examiner(s): Gantt, Alan T.
• Application Number:
  US10/087,682
• Publication Number:
  US 20020123372A1
• Time in Patent Office: 634 Days
• Field of Search: 455/277.1, 455/277.2, 455/278.1, 455/281, 455/562, 375/347
• US Class Current: 455/562.1
• CPC Class Codes: H01Q 3/26 varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture H01Q3/12, H01Q3/22, H01Q3/24 take precedence
• CPC Class Codes: H01Q 3/267 Phased-array testing or checking devices
• CPC Class Codes: H04B 7/0615 of weighted versions of same signal
• CPC Class Codes: H04B 7/0854 using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion

Abstract

A variation compensating unit that compensates an amplitude variation and phase variation efficiently and that improves system reliability and communication quality. A first combining section generates a first combined signal by combining signal on different transmission paths in which a variation has not occurred. A second combining section generates a second combined signal by combining signal on the different transmission paths in which a variation has occurred. A compensation value calculating section calculates compensation values for compensating variation according to the transmission paths on the basis of the first combined signal, the second combined signal, and signal on each transmission path in which a variation has not occurred or in which a variation has occurred. A compensating section compensates variation dynamically on the basis of the compensation values.

Claims

1. A variation compensating unit for compensating variation including at least one of an amplitude variation and phase variation which will occur in the case of transmitting signals via transmission paths, the unit comprising:

a first combining section for generating a first combined signal by combining signals on different transmission paths in which the variation has not occurred;

a second combining section for generating a second combined signal by combining signals on the different transmission paths in which the variation has occurred;

a compensation value calculating section for calculating compensation values for compensating the variation according to the transmission paths on the basis of the first combined signal, the second combined signal, and the signals on the different transmission paths in which the variation has not occurred or in which the variation has occurred; and

a compensating section for compensating the variation dynamically on the basis of the compensation values.

2. The variation compensating unit according to claim 1, wherein the first combining section and the second combining section perform the process of combining signals with equal amplitude and the same phase.

3. The variation compensating unit according to claim 1, wherein the second combining section performs a combination process by the use of the same combination weights that are used by the first combining section.

4. The variation compensating unit according to claim 1, wherein the compensating section compensates the variation by performing an operation process on signals on each of the transmission paths in which the variation has not occurred by the use of the compensation values.

5. The variation compensating unit according to claim 1, wherein the compensating section compensates the variation by performing an operation process on signals on each of the transmission paths in which the variation has occurred by the use of the compensation values.

6. The variation compensating unit according to claim 1, further comprising on each of the transmission paths:

a multiplying section for giving any amplitude and phase rotation to the signal by multiplying the signal and a weight together; and

an inverse operation section for performing an operation being the inverse of a multiplicative operation performed by the multiplying section.

7. The variation compensating unit according to claim 1, wherein the first combining section updates combination weights so that output obtained by combining signals on the different transmission paths in which the variation has not occurred will be higher than or equal to a certain level.

8. The variation compensating unit according to claim 7, wherein the multiplying section multiplies the signal and a combination weight being higher than or equal to a certain level together.

9. The variation compensating unit according to claim 7, wherein the second combining section combines signals on the different transmission paths in which the variation has occurred by the use of combination weights being higher than or equal to a certain level.

10. The variation compensating unit according to claim 1, wherein the first combining section includes a plurality of combining circuits with different combining methods and selects one of output from the plurality of combining circuits.

11. The variation compensating unit according to claim 10, wherein the multiplying section multiplies the signal and a weight used by the selected combining circuit together.

12. The variation compensating unit according to claim 10, wherein the second combining section includes a plurality of combining circuits with different combining methods and selects a combining circuit that performs the same process as a combining circuit selected by the first combining section performs.

13. The variation compensating unit according to claim 1, wherein the first combining section includes a combined circuit that a plurality of signals are input to and output from and selects one output signal.

14. The variation compensating unit according to claim 13, wherein the multiplying section multiplies the signal and a weight corresponding to selected output together.

15. The variation compensating unit according to claim 13, wherein the second combining section includes a combined circuit that a plurality of signals are input to and output from and selects the same output as the first combining section selects.

16. The variation compensating unit according to claim 1, further comprising a plurality of compensating control sections each including the compensation value calculating section and the compensating section for compensating the variation by the use of a plurality of compensation values.

17. The variation compensating unit according to claim 1, wherein the compensation value calculating section updates weight by sequential processing.

18. The variation compensating unit according to claim 1, further comprising a frequency converting section for making frequency bands for signals used for operations to calculate the compensation values the same.