CA2058191A1 - Arrangement and method for detecting interference in tdma communications system - Google Patents
Arrangement and method for detecting interference in tdma communications systemInfo
- Publication number
- CA2058191A1 CA2058191A1 CA2058191A CA2058191A CA2058191A1 CA 2058191 A1 CA2058191 A1 CA 2058191A1 CA 2058191 A CA2058191 A CA 2058191A CA 2058191 A CA2058191 A CA 2058191A CA 2058191 A1 CA2058191 A1 CA 2058191A1
- Authority
- CA
- Canada
- Prior art keywords
- signal
- comparator
- outputs
- communications system
- delay 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
Links
- 230000001934 delay Effects 0.000 abstract 1
- 230000001360 synchronised effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
Abstract
Interference in a high speed receive signal is effectively detected in a TDMA communications system wherein a plurality of time slots is provided within a TDMA frame. A comparator is arranged to receive a first signal indicative of receive signal strength and a reference level signal. The comparator compares the magnitudes of the two signals applied thereto and outputs a comparison result signal. A delay circuit is supplied with a second signal indicative of a time slot which is not in use and which delays the second signal by a predetermined time using a clock which is synchronized with the time slots of the TDMA frame. A gate circuit, preceded by the comparator and the delay circuit, is supplied with the outputs of the comparator and the delay circuit. The gate circuit outputs a third signal which changes a logic level in the event that the strength of the first signal exceeds that of the reference level signal during the time slot which is not in use.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2413452A JP3036854B2 (en) | 1990-12-21 | 1990-12-21 | Interference detection circuit |
JP2-413452 | 1990-12-21 |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2058191A1 true CA2058191A1 (en) | 1992-06-22 |
CA2058191C CA2058191C (en) | 1998-02-10 |
Family
ID=18522087
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002058191A Expired - Fee Related CA2058191C (en) | 1990-12-21 | 1991-12-20 | Arrangement and method for detecting interference in tdma communications system |
Country Status (7)
Country | Link |
---|---|
US (1) | US5280471A (en) |
EP (1) | EP0492531B1 (en) |
JP (1) | JP3036854B2 (en) |
AU (1) | AU641834B2 (en) |
CA (1) | CA2058191C (en) |
DE (1) | DE69112006T2 (en) |
HK (1) | HK89097A (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06284085A (en) * | 1993-03-25 | 1994-10-07 | Toshiba Corp | Digital radio communication equipment |
US5768260A (en) * | 1993-06-02 | 1998-06-16 | Telefonaktiebolaget Lm Ericsson | Device for changing the transmission parameters in a radio transmitter |
FI109740B (en) * | 1993-06-11 | 2002-09-30 | Nokia Corp | A method of testing a transmitter-receiver unit as well as a base station in a time-division radio system |
NZ264830A (en) * | 1993-11-15 | 1996-11-26 | Alcatel Australia | Extending the range of a time division multiple access cellular communication system |
US5574979A (en) * | 1994-06-03 | 1996-11-12 | Norand Corporation | Periodic interference avoidance in a wireless radio frequency communication system |
JP3078177B2 (en) * | 1994-07-01 | 2000-08-21 | 三菱電機株式会社 | Wireless device |
US5455821A (en) * | 1994-11-10 | 1995-10-03 | Motorola, Inc. | Communication system resource allocation method |
US5875180A (en) * | 1997-02-06 | 1999-02-23 | Globalstar L.P. | Satellite telephone interference avoidance system |
EP0881785A1 (en) | 1997-05-29 | 1998-12-02 | Alcatel | Telecommunication system, radio system, and method |
EP1028546A1 (en) * | 1999-02-10 | 2000-08-16 | ICO Services Ltd. | Communications apparatus and method |
JP2001128232A (en) * | 1999-10-29 | 2001-05-11 | Oki Electric Ind Co Ltd | Communication channel decision circuit in response to radio wave strength |
US7477920B2 (en) * | 2002-10-25 | 2009-01-13 | Intel Corporation | System and method for automatically configuring and integrating a radio base station into an existing wireless cellular communication network with full bi-directional roaming and handover capability |
US20060211389A1 (en) * | 2005-03-21 | 2006-09-21 | Intel Corporation | Method and apparatus for narrowband platform interference mitigation |
US8355378B2 (en) * | 2007-03-09 | 2013-01-15 | Intel Corporation | Hierarchical cell deployment |
US8310123B2 (en) * | 2008-07-28 | 2012-11-13 | Direct Drive Systems, Inc. | Wrapped rotor sleeve for an electric machine |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4785450B1 (en) * | 1987-08-06 | 1999-10-12 | Interdigital Tech Corp | Apparatus and method for obtaining frequency agility in digital communication system |
US5148548A (en) * | 1989-12-19 | 1992-09-15 | Northern Telecom Limited | Method of monitoring cellular radio channels to avoid adjacent and co-channel interference |
-
1990
- 1990-12-21 JP JP2413452A patent/JP3036854B2/en not_active Expired - Fee Related
-
1991
- 1991-12-20 US US07/811,290 patent/US5280471A/en not_active Expired - Lifetime
- 1991-12-20 DE DE69112006T patent/DE69112006T2/en not_active Expired - Fee Related
- 1991-12-20 CA CA002058191A patent/CA2058191C/en not_active Expired - Fee Related
- 1991-12-20 EP EP91121999A patent/EP0492531B1/en not_active Expired - Lifetime
- 1991-12-23 AU AU90002/91A patent/AU641834B2/en not_active Ceased
-
1997
- 1997-06-26 HK HK89097A patent/HK89097A/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
AU9000291A (en) | 1992-06-25 |
US5280471A (en) | 1994-01-18 |
CA2058191C (en) | 1998-02-10 |
JPH04222130A (en) | 1992-08-12 |
DE69112006D1 (en) | 1995-09-14 |
EP0492531A1 (en) | 1992-07-01 |
HK89097A (en) | 1997-06-27 |
EP0492531B1 (en) | 1995-08-09 |
DE69112006T2 (en) | 1996-01-04 |
JP3036854B2 (en) | 2000-04-24 |
AU641834B2 (en) | 1993-09-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |