| Presentation | 2004/10/15 A New Switching Scheme Using Hadamard-Coded CDMA and Onboard Multiport Coupler for Multibeam Satellites(System Engineering III)(Joint Conference on Satellite Communications 2004(JC-SAT 2004)) Imam Mahmud, Taifur Rahaman, Al wazedi, Makoto Kawai, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Satellite communications are the outcome of research in the area of communications in which the objective is to achieve ever increasing ranges and capacities with the lowest possible costs. With a conventional single beam satellite the transmission capacity is limited due to its low antenna gain, so a multibeam satellite which can make the antenna gain much higher is prospective. In the multibeam system an onboard switching device is necessary to interconnect among beams. For example, the payload for SS-TDMA includes a programmable switch matrix having a number of inputs and outputs equal to the number of beams. This paper proposes a new alternative system for controlling the interconnection without onboard switch devices. This system uses Hadamard-coded CDMA as a multiple access scheme and a Multiport coupler onboard. Each earth station chooses the appropriate Hadamard code corresponding to the destination beam. The satellite which includes passive circuits using a multiport coupler autonomously controls the routing of the CDMA signals transmitted from earth stations. This system can be used effectively for sending signals from a source to a destination beam and reduces the controlling complexity. This paper presents a system model which can eliminate the onboard switching in the satellite and also the performance of the system. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Multibeam / Multiport coupler / CDMA / Hadamard code |
| Paper # | SAT2004-138 |
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| Committee | SAT |
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| Conference Date | 2004/10/15(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Satellite Telecommunications (SAT) |
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| Language | ENG |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A New Switching Scheme Using Hadamard-Coded CDMA and Onboard Multiport Coupler for Multibeam Satellites(System Engineering III)(Joint Conference on Satellite Communications 2004(JC-SAT 2004)) |
| Sub Title (in English) | |
| Keyword(1) | Multibeam |
| Keyword(2) | Multiport coupler |
| Keyword(3) | CDMA |
| Keyword(4) | Hadamard code |
| 1st Author's Name | Imam Mahmud |
| 1st Author's Affiliation | Graduate School of Science and Engineering() |
| 2nd Author's Name | Taifur Rahaman |
| 2nd Author's Affiliation | Graduate School of Science and Engineering |
| 3rd Author's Name | Al wazedi |
| 3rd Author's Affiliation | Graduate School of Science and Engineering |
| 4th Author's Name | Makoto Kawai |
| 4th Author's Affiliation | Graduate School of Science and Engineering |
| Date | 2004/10/15 |
| Paper # | SAT2004-138 |
| Volume (vol) | vol.104 |
| Number (no) | 352 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |