CA2439287A1 - Frame synchronization method and system - Google Patents
Frame synchronization method and system Download PDFInfo
- Publication number
- CA2439287A1 CA2439287A1 CA002439287A CA2439287A CA2439287A1 CA 2439287 A1 CA2439287 A1 CA 2439287A1 CA 002439287 A CA002439287 A CA 002439287A CA 2439287 A CA2439287 A CA 2439287A CA 2439287 A1 CA2439287 A1 CA 2439287A1
- Authority
- CA
- Canada
- Prior art keywords
- bits
- synchronization
- frame
- word
- control bits
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0602—Systems characterised by the synchronising information used
- H04J3/0605—Special codes used as synchronising signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0602—Systems characterised by the synchronising information used
- H04J3/0605—Special codes used as synchronising signal
- H04J3/0611—PN codes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
- H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
- H04L7/043—Pseudo-noise [PN] codes variable during transmission
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
A method and system for frame synchronization in a digital data transmission . A synchronization word is selected that is suitable for good correlation in a receiver detector. Either traffic bits or control bits are interleaved withi n the synchronization word in a predetermined pattern that is fixed for consecutive frames. The position of the sync word is varied from frame-to- frame. Also, the interleaved bits that are either traffic or control bits varies substantially between consecutive frames.
Claims (21)
1. A method of frame synchronization in a digital data transmission, the method comprising the steps of:
selecting a synchronization word suitable for good correlation in a receiver detector;
interleaving bits of at least one of traffic bits and control bits within said synchronization word in a predetermined fixed pattern for consecutive frames, said interleaving at least one of tragic bits and control bits varying substantially between consecutive frames; and varying a position of said interleaved synchronization word and at least one of traffic bits and control bits within consecutive frames in said transmission in a predictable manner.
selecting a synchronization word suitable for good correlation in a receiver detector;
interleaving bits of at least one of traffic bits and control bits within said synchronization word in a predetermined fixed pattern for consecutive frames, said interleaving at least one of tragic bits and control bits varying substantially between consecutive frames; and varying a position of said interleaved synchronization word and at least one of traffic bits and control bits within consecutive frames in said transmission in a predictable manner.
2. The method as claimed in claim 1, wherein said interleaving comprises interleaving said control bits, said control bits defining said position, said position varying according to pseudo-random function.
3. The method as claimed in claim 2, wherein said step of interleaving comprises interleaving only said control bits within said synchronization word.
4. The method as claimed in claim 3, wherein additional overhead bits are positioned adjacent said interleaved bits.
5. The method as claimed in claim 4, wherein said additional overhead bits comprise an orderwire word and a radio information link word.
6. The method as claimed in claim 2, further comprising of:
detecting an error in said synchronization word;
confirming that said frame synchronization is valid when said error is detected and said control bits detected match and expected next value from said pseudo-random function.
detecting an error in said synchronization word;
confirming that said frame synchronization is valid when said error is detected and said control bits detected match and expected next value from said pseudo-random function.
7. The method as claimed in claim 3, wherein said synchronization word has an autocorrelation characterized by a number of bits that are alike being not larger than n/2+2, where n is the number of synchronization word bits compared.
8. The method as claimed in claim 7, wherein there are 15 said control bits and said synchronization word comprises 49 bits.
9. The method as claimed in claim 2, further comprising a step of scrambling or encrypting said traffic bits using said position determined according to said pseudo-random function.
10. A method as claimed in claim 1 wherein said interleaving comprises interleaving said control bits, said control bits defining said position in the current frame.
11. A method as claimed in claim 1 wherein said interleaving comprises interleaving said control bits, said control bits defining said position in the next frame.
12. A frame synchronization system for a digital transmission, said system comprising:
a synchronization store for providing a synchronization word;
a pseudo-random number generator for providing a control word including control bits;
an interleaves coupled from said synchronization store and said pseudo-random generator and for interleaving said control bits within said synchronization word in a predetermined pattern that is fixed for consecutive frames and in which the control bits vary substantially between consecutive frames;
the value of said control word defining the position of said synchronization word along a frame; and wherein the position of said synchronization word along said frame varies between consecutive frames.
a synchronization store for providing a synchronization word;
a pseudo-random number generator for providing a control word including control bits;
an interleaves coupled from said synchronization store and said pseudo-random generator and for interleaving said control bits within said synchronization word in a predetermined pattern that is fixed for consecutive frames and in which the control bits vary substantially between consecutive frames;
the value of said control word defining the position of said synchronization word along a frame; and wherein the position of said synchronization word along said frame varies between consecutive frames.
13. A frame synchronization systems as claimed in claim 12, wherein the value of the control word defines the position of the synchronization word along the current frame.
14. A frame synchronization system as claimed in claim 12 wherein the value of the control word defines the position of the synchronization word along the next frame.
15. A frame synchronization system as claimed in claim 12 further including a traffic data source and a frame builder with the output of the traffic data source, as well as the output from the interleaver coupling to the frame builder.
16. A frame synchronization system as claimed in claim 15 further including a scrambler coupled from the output of the frame builder and a transmitter coupled from the output of the scrambler.
17. A frame synchronization system as claimed in claim 16 wherein said scrambler is controlled in accordance with the output from said pseudo-random. number generator.
18. A frame synchronization system as claimed in claim 16 further including a receiver section including a sync recovery unit, a traffic recovery unit and a validator.
19. A frame synchronization system as claimed in claim 18 further including a receiver for coupling signals to the sync recovery unit and the traffic recovery unit, the output of the sync recovery unit coupling to the validator.
20. A frame synchronization, system as claimed in claim 19 further including an initialization unit coupled from the output of the sync recovery unit and a pseudo-random number generator unit-coupled from the initialization unit and having its output coupled to the validator.
21. A frame synchronization system as claimed in claim 20 further including a descrambler coupled from the output of the validator and the traffic recovery unit, with the date output taken from the output of the descrambler.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US79424701A | 2001-02-28 | 2001-02-28 | |
| US09/794,247 | 2001-02-28 | ||
| PCT/CA2001/000362 WO2002073848A1 (en) | 2001-02-28 | 2001-03-19 | Frame synchronization method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2439287A1 true CA2439287A1 (en) | 2002-09-19 |
| CA2439287C CA2439287C (en) | 2009-12-15 |
Family
ID=25162115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002439287A Expired - Fee Related CA2439287C (en) | 2001-02-28 | 2001-03-19 | Frame synchronization method and system |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2439287C (en) |
| WO (1) | WO2002073848A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4050595B2 (en) * | 2002-11-11 | 2008-02-20 | 松下電器産業株式会社 | Wireless communication system, wireless communication method, and wireless communication apparatus |
| DE102005025328B4 (en) * | 2005-05-31 | 2007-06-28 | Siemens Ag | Method for transmitting synchronization messages |
| WO2008113754A2 (en) * | 2007-03-16 | 2008-09-25 | Gigaset Communications Gmbh | Device and method for controlling the creation of a user channel connection in a communication system and associated communication system, digital storage medium, computer program product, and computer program |
| CN103997483B (en) * | 2013-02-20 | 2018-06-01 | 联想(北京)有限公司 | A kind of information security control method, device and electronic equipment |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4757536A (en) * | 1984-10-17 | 1988-07-12 | General Electric Company | Method and apparatus for transceiving cryptographically encoded digital data |
| JPS61117939A (en) * | 1984-11-13 | 1986-06-05 | Koonan Eng Kk | Signal synchronizing system for data transmission |
| GB2180127B (en) * | 1985-09-04 | 1989-08-23 | Philips Electronic Associated | Method of data communication |
| US4866773A (en) * | 1988-05-20 | 1989-09-12 | Dan Lubarsky | System for interfacing a digital encryption device to a time-division multiplexed communication system |
| US5003599A (en) * | 1989-02-07 | 1991-03-26 | Simulation Laboratories, Inc. | In-band framing method and apparatus |
| US5185796A (en) * | 1991-05-30 | 1993-02-09 | Motorola, Inc. | Encryption synchronization combined with encryption key identification |
-
2001
- 2001-03-19 CA CA002439287A patent/CA2439287C/en not_active Expired - Fee Related
- 2001-03-19 WO PCT/CA2001/000362 patent/WO2002073848A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| CA2439287C (en) | 2009-12-15 |
| WO2002073848A1 (en) | 2002-09-19 |
| WO2002073848B1 (en) | 2002-11-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20190319 |