JPS6450636A - Synchronization preservation system for spread spectrum receiver - Google Patents
Synchronization preservation system for spread spectrum receiverInfo
- Publication number
- JPS6450636A JPS6450636A JP62207950A JP20795087A JPS6450636A JP S6450636 A JPS6450636 A JP S6450636A JP 62207950 A JP62207950 A JP 62207950A JP 20795087 A JP20795087 A JP 20795087A JP S6450636 A JPS6450636 A JP S6450636A
- Authority
- JP
- Japan
- Prior art keywords
- pulse
- pulse train
- output
- generator
- transition
- 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
Abstract
PURPOSE:To preserve synchronization surely with a simple mode by applying feedback control to an output pulse obtained through the storage of a coincidence signal between an output transition pulse and a code transition pulse of a shoed noise generator with a deviation being the result of phase comparision with a clock output of a voltage controlled crystal oscillator. CONSTITUTION:A transition pulse generator 52 generates a code pulse train Ds' representing the transition timing of shoed noise of a PN (shoed noise) generator 46. The synchronizing state is formed periodically for the pulse train Ds' and a received pulse train Ds at the sender side corresponding thereto according to the degree of deviation and part of the pulse train Ds and the output pulse train Ds' are roughly coincident. A pulse having a prescribed interval depending on the difference of the tip rate of the pulse trains Ds and Ds' is stored gradually in a coherent integration device 60. A correct clock phase is kept continuously by applying feedback to the clock frequency via a voltage controlled crystal oscillator 40 depending on the deviation of the phase between the output pulse train of the coherent integration device 60 and the clock fed to the existing PN generator 46.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62207950A JP2537634B2 (en) | 1987-08-21 | 1987-08-21 | Synchronous holding method for spread spectrum receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62207950A JP2537634B2 (en) | 1987-08-21 | 1987-08-21 | Synchronous holding method for spread spectrum receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6450636A true JPS6450636A (en) | 1989-02-27 |
| JP2537634B2 JP2537634B2 (en) | 1996-09-25 |
Family
ID=16548222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62207950A Expired - Lifetime JP2537634B2 (en) | 1987-08-21 | 1987-08-21 | Synchronous holding method for spread spectrum receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2537634B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6158732A (en) * | 1998-10-02 | 2000-12-12 | Nec Corporation | Sheet feeder for transferring a rectangular sheet |
-
1987
- 1987-08-21 JP JP62207950A patent/JP2537634B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6158732A (en) * | 1998-10-02 | 2000-12-12 | Nec Corporation | Sheet feeder for transferring a rectangular sheet |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2537634B2 (en) | 1996-09-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080708 Year of fee payment: 12 |