JPS645248A - C/n measuring circuit - Google Patents

C/n measuring circuit

Info

Publication number
JPS645248A
JPS645248A JP16210987A JP16210987A JPS645248A JP S645248 A JPS645248 A JP S645248A JP 16210987 A JP16210987 A JP 16210987A JP 16210987 A JP16210987 A JP 16210987A JP S645248 A JPS645248 A JP S645248A
Authority
JP
Japan
Prior art keywords
signal
condition
low
weighting
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP16210987A
Other languages
Japanese (ja)
Other versions
JPH0479497B2 (en
Inventor
Susumu Otani
Toshiya Todoroki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP16210987A priority Critical patent/JPS645248A/en
Priority to DE3854505T priority patent/DE3854505T2/en
Priority to CA000570052A priority patent/CA1332450C/en
Priority to AU18248/88A priority patent/AU594621B2/en
Priority to EP88305685A priority patent/EP0296822B1/en
Priority to DE3886107T priority patent/DE3886107T2/en
Priority to EP92201171A priority patent/EP0497433B1/en
Priority to US07/210,653 priority patent/US4835790A/en
Publication of JPS645248A publication Critical patent/JPS645248A/en
Publication of JPH0479497B2 publication Critical patent/JPH0479497B2/ja
Priority to CA000616675A priority patent/CA1333922C/en
Granted legal-status Critical Current

Links

Landscapes

  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To attain C/N measurement with high accuracy even under low C/N condition by applying weighting processing to a signal subjected to absolute value operation and applying averaging processing after reducing the effect of loopback caused under low C/N condition. CONSTITUTION:When a received base band signal string relates a binary digital signal in a weighting circuit 102, a threshold value TH is set to a point by a proper distance advanced from a midpoint of both signal points toward the signal point. In this case, a weighting constant -alpha is set properly so as to reduce the contribution of the most largest effect by loopback. The output is given to a 1st square circuit 104 via a 1st averaging circuit 103. Thus, the estimation accuracy of the signal power under the low C/N condition is improved and the C/N is measured with high accuracy even under the low C/N condition.
JP16210987A 1987-06-23 1987-06-29 C/n measuring circuit Granted JPS645248A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
JP16210987A JPS645248A (en) 1987-06-29 1987-06-29 C/n measuring circuit
DE3886107T DE3886107T2 (en) 1987-06-23 1988-06-22 Carrier / noise detector for digital transmission systems.
CA000570052A CA1332450C (en) 1987-06-23 1988-06-22 Carrier-to-noise detector for digital transmission systems
AU18248/88A AU594621B2 (en) 1987-06-23 1988-06-22 Carrier-to-noise detector for digital transmission systems
EP88305685A EP0296822B1 (en) 1987-06-23 1988-06-22 Carrier-to-noise detector for digital transmission systems
DE3854505T DE3854505T2 (en) 1987-06-23 1988-06-22 Phase-controlled demodulation device for digital communication.
EP92201171A EP0497433B1 (en) 1987-06-23 1988-06-22 Phase controlled demodulation system for digital communication
US07/210,653 US4835790A (en) 1987-06-23 1988-06-23 Carrier-to-noise detector for digital transmission systems
CA000616675A CA1333922C (en) 1987-06-23 1993-07-22 Phase controlled demodulation system for digital communication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16210987A JPS645248A (en) 1987-06-29 1987-06-29 C/n measuring circuit

Publications (2)

Publication Number Publication Date
JPS645248A true JPS645248A (en) 1989-01-10
JPH0479497B2 JPH0479497B2 (en) 1992-12-16

Family

ID=15748213

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16210987A Granted JPS645248A (en) 1987-06-23 1987-06-29 C/n measuring circuit

Country Status (1)

Country Link
JP (1) JPS645248A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022179902A (en) * 2021-05-24 2022-12-06 エレックス工業株式会社 Ad converter and broadband noise power measurement device using the same, and power spectrum measurement device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022179902A (en) * 2021-05-24 2022-12-06 エレックス工業株式会社 Ad converter and broadband noise power measurement device using the same, and power spectrum measurement device

Also Published As

Publication number Publication date
JPH0479497B2 (en) 1992-12-16

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees