GB1522921A - Method of transmitting information for transmission paths distorted in a linear manner and having frequency shifts - Google Patents
Method of transmitting information for transmission paths distorted in a linear manner and having frequency shiftsInfo
- Publication number
- GB1522921A GB1522921A GB841977A GB841977A GB1522921A GB 1522921 A GB1522921 A GB 1522921A GB 841977 A GB841977 A GB 841977A GB 841977 A GB841977 A GB 841977A GB 1522921 A GB1522921 A GB 1522921A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- correction
- local oscillator
- test sequences
- signal
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/005—Control of transmission; Equalising
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/68—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for wholly or partially suppressing the carrier or one side band
Abstract
1522921 A.C. systems; correcting frequency shift LICENTIA PATENT VERWALTUNGS GmbH 28 Feb 1977 [28 Feb 1976] 08419/77 Headings H4L and H4P In a suppressed or reduced carrier single or double sideband data communication system wherein the incoming signal is demodulated in quadrature channels sin and cos, the intermediate frequency signal ZF being mixed with in-phase and quadrature versions of a local oscillator signal at carrier frequency #/2#, the mixer outputs being low pass, match filtered, thence a/d converted, the transmitted signal comprises Barker code test sequences sandwiching data packages, see Fig. 3a (not shown). The demodulated test sequences pass to a processor wherein, in virtue of their character, they can be pulse compressed to form pulses whose distribution and movement between the cos and sin channels enables the detection and correction of frequency errors; including those due to the Doppler effect between the transmitter and receiver; at the receiver local oscillator. Examples of pulse distributions for correct, and incorrect local oscillator frequencies, are displayed in Figs. 3c, 3e; 3b, 3d (not shown). Frequency errors up to 180‹ per test sequence spacing (#t, Fig. 3a) can be corrected without ambiguity. For coarse frequency correction, a pair of close spaced test sequences, Fig. 1 (not shown) precedes the first bit sequence before a data package, enabling coarse correction, Figs. 4a-4d (not shown) before the ongoing fine correction occurring during data transmission.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19762608258 DE2608258C2 (en) | 1976-02-28 | 1976-02-28 | Single-sideband or double-sideband communication methods without a carrier |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1522921A true GB1522921A (en) | 1978-08-31 |
Family
ID=5971167
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB841977A Expired GB1522921A (en) | 1976-02-28 | 1977-02-28 | Method of transmitting information for transmission paths distorted in a linear manner and having frequency shifts |
Country Status (4)
Country | Link |
---|---|
DE (1) | DE2608258C2 (en) |
FR (1) | FR2342595A1 (en) |
GB (1) | GB1522921A (en) |
IT (1) | IT1077127B (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2653970C2 (en) * | 1976-11-27 | 1985-12-05 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Message transmission method |
DE3033226A1 (en) * | 1980-09-04 | 1982-04-22 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Pulse compression filter for single-double sideband data transmission - uses filter coefficients derived from bit values of time inverse sequence |
FR2525055A1 (en) * | 1982-04-09 | 1983-10-14 | Trt Telecom Radio Electr | METHOD OF CORRECTING FREQUENCY OF THE LOCAL CARRIER IN THE RECEIVER OF A DATA TRANSMISSION SYSTEM AND RECEIVER USING THE SAME |
DE3918340A1 (en) * | 1989-06-06 | 1990-12-13 | Thomson Brandt Gmbh | PROCEDURE FOR SIGNAL EQUALIZATION |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2247190C3 (en) * | 1972-09-26 | 1980-12-04 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Procedure for setting the carrier phase in the transmission of signals |
US3962637A (en) * | 1974-11-11 | 1976-06-08 | Hycom Incorporated | Ultrafast adaptive digital modem |
-
1976
- 1976-02-28 DE DE19762608258 patent/DE2608258C2/en not_active Expired
-
1977
- 1977-02-25 IT IT2071177A patent/IT1077127B/en active
- 1977-02-28 GB GB841977A patent/GB1522921A/en not_active Expired
- 1977-02-28 FR FR7705789A patent/FR2342595A1/en active Granted
Also Published As
Publication number | Publication date |
---|---|
DE2608258C2 (en) | 1984-04-05 |
FR2342595A1 (en) | 1977-09-23 |
IT1077127B (en) | 1985-05-04 |
DE2608258A1 (en) | 1977-09-01 |
FR2342595B1 (en) | 1983-09-09 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
746 | Register noted 'licences of right' (sect. 46/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |