Patent US6806844B2 successfully refreshed from Google Patents.
US6806844B2
Expired / Lapsed
US
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Calibration system for array antenna receiving apparatus
Assignee: NEC Corp
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Filing: 2001-05-23
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Granted: 2004-10-19
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Expires: 2021-05-23
Abstract
Abstract A calibration system of an array antenna receiving apparatus is used for cellular mobile communication systems. In the array antenna receiving apparatus of the present calibration system, a calibration time determining unit (111) determines an adaptive calibration time based on detection voltages of the total reception power inputted to antenna radio receiving units (104-1 to 104-N). Next, a calibration signal processing unit (112) detects phase/amplitude information of a calibration signal from multiplexing signals outputted from the antenna radio receiving units based on the longest calibration time among the calibration times. User signal processing units (108-1 to 108-M) correct outputs from the antenna radio receiving units based on the phase/amplitude information. Therefore, the deterioration of the reception sensitivity of a user signal to a mobile machine can be prevented and the reduction of the number of users in the cellular system can further be prevented.
Inventors
- 👤 Tomohiro Azuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:31
CPC Classifications
H; H04; H04B; H04B17/00; H04B17/0082; H04B17/0085; H01; H01Q; H01Q3/00; H01Q3/26; H01Q3/267; H04B17/20; H04B17/21; H04B17/22; H04B17/221; H04B17/30; H04B17/309; H04B17/318; H04B17/327; H04B7/00; H04B7/02; H04B7/04; H04B7/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
202 words
A calibration system of an array antenna receiving apparatus, for inputting a multiplexing signal which is obtained by multiplexing a well-known calibration signal to signals received from antenna devices forming an array antenna corresponding to the antenna devices, for detecting phase/amplitude information of the calibration signal every antenna radio receiving unit connected to each antenna device, based on the calibration signal extracted from the multiplexing signals, and for correcting a user signal to a mobile machine which is received every antenna radio receiving unit connected to each antenna device based on the phase/amplitude information, said calibration system comprising: radio control means for detecting a detection voltage of the total reception power of the inputted multiplexing signal and for gain controlling the received multiplexing signal in accordance with the detection voltage and for outputting the controlled signal as a signal for extracting the calibration signal; and signal processing means for receiving the detection voltage of the total reception power from said control means, for determining an adaptive calibration time every antenna device based on the detection voltage, and for detecting and outputting the phase/amplitude information of the calibration signal from the multiplexing signal based on the longest calibration time among the calibration times.
Claim 2
Dependent Claim
202 words
A calibration system of an array antenna receiving apparatus, for inputting a multiplexing signal which is obtained by multiplexing a well-known calibration signal to signals received from antenna devices forming an array antenna corresponding to the antenna devices, for detecting phase/amplitude information of the calibration signal every antenna radio receiving unit connected to each antenna device, based on the calibration signal extracted from the multiplexing signals, and for correcting a user signal to a mobile machine which is received every antenna radio receiving unit connected to each antenna device based on the phase/amplitude information, said calibration system comprising: radio control means for detecting a detection voltage of the total reception power of the inputted multiplexing signal and for gain controlling the received multiplexing signal in accordance with the detection voltage and for outputting the controlled signal as a signal for extracting the calibration signal; and signal processing means for receiving the detection voltage of the total reception power from said control means, for determining an adaptive calibration time every antenna device based on the detection voltage, and for detecting and outputting the phase/amplitude information of the calibration signal from the multiplexing signal based on the longest calibration time among the calibration times.
Claim 3
Dependent Claim
314 words
A calibration system of an array antenna receiving apparatus comprising a calibration radio transmitting unit for transmitting a well-known calibration signal, an antenna radio receiving unit connected to corresponding antenna devices forming an array antenna, for inputting a signal multiplexing the calibration signal to a signal received from each antenna device, a calibration signal processing unit for detecting phase/amplitude information of the calibration signal every antenna radio receiving unit based on the calibration signal extracted from each of said antenna radio receiving units, and a user signal processing unit for correcting a user signal to a mobile machine, which is received by each of said antenna radio receiving units based on the phase/amplitude information every antenna detected by said calibration signal processing unit, said calibration system further comprising: a radio control unit arranged to each of said antenna radio receiving units, for outputting an AGC control signal for controlling gain in accordance with a detection voltage of the total reception power inputted to the corresponding antenna radio receiving unit; and a calibration time determining unit for determining and outputting an adaptive calibration time every antenna radio receiving unit based on the detection voltage of the total reception power inputted to each of said antenna radio receiving units, wherein each of said antenna radio receiving unit detects the detection voltage of the total reception power of the inputted multiplexing signal, outputs the detection voltage to said radio control unit, and outputs gain of the received multiplexing signal by gain in accordance with the AGC control signal received from the corresponding radio control unit, and said calibration signal processing unit detects and outputs the phase/amplitude information of the calibration signal from the multiplexing signal outputted from each of said antenna radio receiving units based on the longest calibration time among the calibration times of the antenna radio receiving units outputted from said calibration time determining unit.
Claim 4
Dependent Claim
314 words
A calibration system of an array antenna receiving apparatus comprising a calibration radio transmitting unit for transmitting a well-known calibration signal, an antenna radio receiving unit connected to corresponding antenna devices forming an array antenna, for inputting a signal multiplexing the calibration signal to a signal received from each antenna device, a calibration signal processing unit for detecting phase/amplitude information of the calibration signal every antenna radio receiving unit based on the calibration signal extracted from each of said antenna radio receiving units, and a user signal processing unit for correcting a user signal to a mobile machine, which is received by each of said antenna radio receiving units based on the phase/amplitude information every antenna detected by said calibration signal processing unit, said calibration system further comprising: a radio control unit arranged to each of said antenna radio receiving units, for outputting an AGC control signal for controlling gain in accordance with a detection voltage of the total reception power inputted to the corresponding antenna radio receiving unit; and a calibration time determining unit for determining and outputting an adaptive calibration time every antenna radio receiving unit based on the detection voltage of the total reception power inputted to each of said antenna radio receiving units, wherein each of said antenna radio receiving unit detects the detection voltage of the total reception power of the inputted multiplexing signal, outputs the detection voltage to said radio control unit, and outputs gain of the received multiplexing signal by gain in accordance with the AGC control signal received from the corresponding radio control unit, and said calibration signal processing unit detects and outputs the phase/amplitude information of the calibration signal from the multiplexing signal outputted from each of said antenna radio receiving units based on the longest calibration time among the calibration times of the antenna radio receiving units outputted from said calibration time determining unit.
Claim 5
Dependent Claim
54 words
A calibration system of an array antenna receiving apparatus according to claim 2 , wherein said calibration radio transmitting unit transmits the calibration signal which is multiplexed and inputted to each of said antenna radio receiving units by fixed power which is sufficiently lower than thermal noise power in said array antenna receiving apparatus.
Claim 6
Dependent Claim
65 words
A calibration system of an array antenna receiving apparatus according to claim 2 , wherein said calibration signal processing unit adds the multiplexing signals outputted from said antenna radio receiving units by using the common mode by the longest calibration time and averages the calibration signals included in the multiplexing signals, thereby detecting the phase/amplitude information of the calibration signal every antenna radio receiving unit.
Claim 7
Dependent Claim
44 words
A calibration system of an array antenna receiving apparatus according to claim 2 , wherein said calibration signal processing unit detects and outputs the phase/amplitude information of each antenna radio receiving unit every calibration period having a period length of the longest calibration time.
Claim 8
Dependent Claim
56 words
A calibration system of an array antenna receiving apparatus according to claim 2 , wherein said calibration time determining unit determines and outputs the adaptive calibration time every antenna radio receiving unit based on the AGC control signal from each of said radio control units, in place of the detection voltage of the total reception power.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2007-10-19 | 2008-04-19 | 2008-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-10-19 | 2012-04-19 | 2012-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-10-19 | 2016-04-19 | 2016-10-19 | $7700.00 | Window Closed / Lapsed |