SE7903648L - DIGITAL ADAPTIVE REMOVER - Google Patents
DIGITAL ADAPTIVE REMOVERInfo
- Publication number
- SE7903648L SE7903648L SE7903648A SE7903648A SE7903648L SE 7903648 L SE7903648 L SE 7903648L SE 7903648 A SE7903648 A SE 7903648A SE 7903648 A SE7903648 A SE 7903648A SE 7903648 L SE7903648 L SE 7903648L
- Authority
- SE
- Sweden
- Prior art keywords
- tap
- clock
- equalizer
- received impulse
- correlated
- Prior art date
Links
- 230000003044 adaptive effect Effects 0.000 title abstract 2
- 239000011159 matrix material Substances 0.000 abstract 1
- 238000005070 sampling Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
- H04L25/03114—Arrangements for removing intersymbol interference operating in the time domain non-adaptive, i.e. not adjustable, manually adjustable, or adjustable only during the reception of special signals
- H04L25/03133—Arrangements for removing intersymbol interference operating in the time domain non-adaptive, i.e. not adjustable, manually adjustable, or adjustable only during the reception of special signals with a non-recursive structure
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Filters That Use Time-Delay Elements (AREA)
- Dc Digital Transmission (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
An automatic adaptive equalizer operates on a test pattern including a carrier-only period, a clock-only period and a single test impulse. The equalizer employs a transversal filter under control of a microprocessor 23. Samples Xi and Yi of in-phase and quadrature phase components of the received impulse response are cross-correlated and auto-correlated to form elements of a complex matrix equation describing the optimum equalizer tap settings CpI and CqI etc. The microprocessor performs a special iterative operation utilizing elements of this equation to rapidly and exactly calculate the optimum initial settings for the tap constants. The clock-only portion of the test pattern is analyzed to set a sampling clock to sample the received impulse so that the tap constant calculation can be carried out within the duration of the received impulse. Initial equalization can be achieved in a time of about 30 milliseconds at a data rate of 9600 bits per second. <IMAGE>
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US90026578A | 1978-04-26 | 1978-04-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE7903648L true SE7903648L (en) | 1980-01-11 |
| SE458327B SE458327B (en) | 1989-03-13 |
Family
ID=25412250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE7903648A SE458327B (en) | 1978-04-26 | 1979-04-25 | DEVICE IN CONNECTION WITH THE REMOVAL ORGANIZATION |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS556989A (en) |
| BE (1) | BE875902A (en) |
| CA (1) | CA1157917A (en) |
| CH (1) | CH645764A5 (en) |
| DE (1) | DE2911845A1 (en) |
| FR (3) | FR2433865A1 (en) |
| GB (5) | GB2075807B (en) |
| SE (1) | SE458327B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57162515A (en) * | 1981-03-31 | 1982-10-06 | Fujitsu Ltd | Automatic equalizer for transmission of data |
| DE3377967D1 (en) * | 1983-09-21 | 1988-10-13 | Trw Inc | Improved modem signal acquisition technique |
| JP2986488B2 (en) * | 1989-10-17 | 1999-12-06 | 日本電信電話株式会社 | Equalizer |
| US20070025475A1 (en) * | 2005-07-28 | 2007-02-01 | Symbol Technologies, Inc. | Method and apparatus for data signal processing in wireless RFID systems |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3962637A (en) * | 1974-11-11 | 1976-06-08 | Hycom Incorporated | Ultrafast adaptive digital modem |
-
1979
- 1979-03-15 CA CA000323512A patent/CA1157917A/en not_active Expired
- 1979-03-26 DE DE19792911845 patent/DE2911845A1/en not_active Ceased
- 1979-04-12 GB GB8118513A patent/GB2075807B/en not_active Expired
- 1979-04-12 GB GB8118511A patent/GB2076266A/en not_active Withdrawn
- 1979-04-12 GB GB8118514A patent/GB2075808B/en not_active Expired
- 1979-04-12 GB GB7913018A patent/GB2022376B/en not_active Expired
- 1979-04-12 GB GB8118512A patent/GB2075806B/en not_active Expired
- 1979-04-25 JP JP5131679A patent/JPS556989A/en active Granted
- 1979-04-25 FR FR7910536A patent/FR2433865A1/en active Granted
- 1979-04-25 SE SE7903648A patent/SE458327B/en not_active IP Right Cessation
- 1979-04-25 CH CH388379A patent/CH645764A5/en not_active IP Right Cessation
- 1979-04-26 BE BE0/194880A patent/BE875902A/en not_active IP Right Cessation
- 1979-12-26 FR FR7931662A patent/FR2437747B1/fr not_active Expired
- 1979-12-26 FR FR7931663A patent/FR2435870A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| CA1157917A (en) | 1983-11-29 |
| FR2433865A1 (en) | 1980-03-14 |
| JPS556989A (en) | 1980-01-18 |
| GB2075806A (en) | 1981-11-18 |
| GB2022376B (en) | 1982-10-06 |
| GB2022376A (en) | 1979-12-12 |
| JPH0152944B2 (en) | 1989-11-10 |
| GB2075806B (en) | 1983-02-23 |
| GB2075808A (en) | 1981-11-18 |
| FR2435870B1 (en) | 1983-12-30 |
| FR2437747A1 (en) | 1980-04-25 |
| BE875902A (en) | 1979-08-16 |
| SE458327B (en) | 1989-03-13 |
| FR2437747B1 (en) | 1986-10-17 |
| GB2076266A (en) | 1981-11-25 |
| GB2075807A (en) | 1981-11-18 |
| DE2911845A1 (en) | 1979-11-08 |
| GB2075808B (en) | 1983-03-02 |
| GB2075807B (en) | 1983-02-23 |
| FR2435870A1 (en) | 1980-04-04 |
| FR2433865B1 (en) | 1983-12-30 |
| CH645764A5 (en) | 1984-10-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| NUG | Patent has lapsed |
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