درباره ما
ITU-R REPORT M.2026
Adaptability of real zero single sideband technology to HF data communications
Year: 2001
Abstract: Introduction
Automated HF communications brought a number of innovative solutions to long standing problems in HF radio links, such as channel selection, unattended operation, and interoperability. These systems rapidly and automatically scanned a set of assigned frequencies, listening for modem tones that carried their call signs. The resulting automatic link establishment (ALE) systems were developed after several industry solutions, and later tried and confirmed in the marketplace [Johnson et al., 1997]. The ALE technology standardized in MIL-STD-188-141A and FED-STD-1045 is under consideration within ITU-R. An ALE-capable radio station consists of an ALE controller, a controllable single sideband (SSB) radio, and transmission equipment such as antennas, etc. More advanced automated stations also include high-speed HF data modems, networking controllers, and so on.
The SSB system, originally developed in the 1910s, is still widely used for HF radiocommunications [Maslin, 1987]. SSB has the distinct advantage of narrow bandwidth, but it is difficult to maintain transparency of received signals through fading environments. In order to cope with fading, the Lincompex system was developed by the British Post Office in the 1960s. In the demodulation process, conventional SSB, including the Lincompex, requires an automatic gain control (AGC) circuit to restore amplitude degradation, and a clarifier to fine tune the frequency. Without employing these two circuits, the detected signal is greatly impaired.
In order to overcome the drawbacks of conventional SSB, the real zero concept was successfully introduced for establishing real zero SSB (RZ SSB) technology for V/UHF bands in Japan [Daikoku and Suwa, 1988]. This is because the SSB is one of the most promising modulation methods for utilizing the limited radio spectrum as effectively as possible.
Anticipating that the RZ SSB technology is effective for data communications over HF radio link, in this Report, the RZ SSB technology is introduced in detail.
Automated HF communications brought a number of innovative solutions to long standing problems in HF radio links, such as channel selection, unattended operation, and interoperability. These systems rapidly and automatically scanned a set of assigned frequencies, listening for modem tones that carried their call signs. The resulting automatic link establishment (ALE) systems were developed after several industry solutions, and later tried and confirmed in the marketplace [Johnson et al., 1997]. The ALE technology standardized in MIL-STD-188-141A and FED-STD-1045 is under consideration within ITU-R. An ALE-capable radio station consists of an ALE controller, a controllable single sideband (SSB) radio, and transmission equipment such as antennas, etc. More advanced automated stations also include high-speed HF data modems, networking controllers, and so on.
The SSB system, originally developed in the 1910s, is still widely used for HF radiocommunications [Maslin, 1987]. SSB has the distinct advantage of narrow bandwidth, but it is difficult to maintain transparency of received signals through fading environments. In order to cope with fading, the Lincompex system was developed by the British Post Office in the 1960s. In the demodulation process, conventional SSB, including the Lincompex, requires an automatic gain control (AGC) circuit to restore amplitude degradation, and a clarifier to fine tune the frequency. Without employing these two circuits, the detected signal is greatly impaired.
In order to overcome the drawbacks of conventional SSB, the real zero concept was successfully introduced for establishing real zero SSB (RZ SSB) technology for V/UHF bands in Japan [Daikoku and Suwa, 1988]. This is because the SSB is one of the most promising modulation methods for utilizing the limited radio spectrum as effectively as possible.
Anticipating that the RZ SSB technology is effective for data communications over HF radio link, in this Report, the RZ SSB technology is introduced in detail.
-
Statistics
ITU-R REPORT M.2026
Show full item record
| contributor author | ITU-R - International Telecommunication Union/ITU Radiocommunication Sector | |
| date accessioned | 2017-09-04T18:50:24Z | |
| date available | 2017-09-04T18:50:24Z | |
| date copyright | 01/01/2001 | |
| date issued | 2001 | |
| identifier other | KUSEUCAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/231853 | |
| description abstract | Introduction Automated HF communications brought a number of innovative solutions to long standing problems in HF radio links, such as channel selection, unattended operation, and interoperability. These systems rapidly and automatically scanned a set of assigned frequencies, listening for modem tones that carried their call signs. The resulting automatic link establishment (ALE) systems were developed after several industry solutions, and later tried and confirmed in the marketplace [Johnson et al., 1997]. The ALE technology standardized in MIL-STD-188-141A and FED-STD-1045 is under consideration within ITU-R. An ALE-capable radio station consists of an ALE controller, a controllable single sideband (SSB) radio, and transmission equipment such as antennas, etc. More advanced automated stations also include high-speed HF data modems, networking controllers, and so on. The SSB system, originally developed in the 1910s, is still widely used for HF radiocommunications [Maslin, 1987]. SSB has the distinct advantage of narrow bandwidth, but it is difficult to maintain transparency of received signals through fading environments. In order to cope with fading, the Lincompex system was developed by the British Post Office in the 1960s. In the demodulation process, conventional SSB, including the Lincompex, requires an automatic gain control (AGC) circuit to restore amplitude degradation, and a clarifier to fine tune the frequency. Without employing these two circuits, the detected signal is greatly impaired. In order to overcome the drawbacks of conventional SSB, the real zero concept was successfully introduced for establishing real zero SSB (RZ SSB) technology for V/UHF bands in Japan [Daikoku and Suwa, 1988]. This is because the SSB is one of the most promising modulation methods for utilizing the limited radio spectrum as effectively as possible. Anticipating that the RZ SSB technology is effective for data communications over HF radio link, in this Report, the RZ SSB technology is introduced in detail. | |
| language | English | |
| title | ITU-R REPORT M.2026 | num |
| title | Adaptability of real zero single sideband technology to HF data communications | en |
| type | standard | |
| page | 6 | |
| status | Active | |
| tree | ITU-R - International Telecommunication Union/ITU Radiocommunication Sector:;2001 | |
| contenttype | fulltext |