| Paper Abstract and Keywords |
| Presentation |
2023-10-10 15:35
[Poster Presentation]
Proposal of superposed transmission scheme in high-speed OFDM signals and low-speed CDMA signals
Sana Kagaya, Yuki Kato, Takatoshi Sugiyama (Kogakuin Univ.) |
| Abstract |
(in Japanese) |
(See Japanese page) |
| (in English) |
In recent years, while Non-Terrestrial Network (NTN) have been attracting attention in Beyond 5G / 6G, in order to provide a wide range of mobile services. In a LEO (Low Earth Orbit) system, one of the NTN elements, high-speed signals such as video signals or a large amount of data and low-speed signals such as IoT (Internet of Things) senser data would be simultaneously transmitted over a same LEO transponder. In this case, an FDMA (Frequency Division Multiple Access) scheme needs guard bands to avoid adjacent channel interferences among high- and low-speed signals. However, it requires additional bandwidths for low-speed signals as the number of high-speed signals increases. To solve this problem, the conventional superposed transmission scheme has been proposed to both high- and low-signals simultaneously over the same transponder. It expands the low-speed signal’s required bandwidth by CDMA (Code Division Multiple Access) spectrum spreading and superposes the low-speed CDMA signals with extremely lower transmission power over the high-speed signals. In the superposed transmission scheme, CDMA is also useful because its excellent interference immunity and multiple connectivity. However, in the conventional scheme, single carrier modulations have only been used for high-speed signals.
In this report, we propose a new superposed transmission scheme in which OFDM (Orthogonal Frequency Division Multiplexing) modulation is applied to high-speed signals. Computer simulations are performed to clarify the bit error rate performances of the both high-speed OFDM signals and low-speed CDMA signals, and the number of simultaneous transmitted CDMA channels is quantitatively demonstrated. |
| Keyword |
(in Japanese) |
(See Japanese page) |
| (in English) |
NTN / LEO / CDMA / OFDM / superposed transmission / / / |
| Reference Info. |
IEICE Tech. Rep. |
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| Conference Information |
| Committee |
MIKA |
| Conference Date |
2023-10-10 - 2023-10-12 |
| Place (in Japanese) |
(See Japanese page) |
| Place (in English) |
Okinawa Jichikaikan |
| Topics (in Japanese) |
(See Japanese page) |
| Topics (in English) |
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| Paper Information |
| Registration To |
MIKA |
| Conference Code |
2023-10-MIKA |
| Language |
Japanese |
| Title (in Japanese) |
(See Japanese page) |
| Sub Title (in Japanese) |
(See Japanese page) |
| Title (in English) |
Proposal of superposed transmission scheme in high-speed OFDM signals and low-speed CDMA signals |
| Sub Title (in English) |
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| Keyword(1) |
NTN |
| Keyword(2) |
LEO |
| Keyword(3) |
CDMA |
| Keyword(4) |
OFDM |
| Keyword(5) |
superposed transmission |
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| 1st Author's Name |
Sana Kagaya |
| 1st Author's Affiliation |
Kogakuin University (Kogakuin Univ.) |
| 2nd Author's Name |
Yuki Kato |
| 2nd Author's Affiliation |
Kogakuin University (Kogakuin Univ.) |
| 3rd Author's Name |
Takatoshi Sugiyama |
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Kogakuin University (Kogakuin Univ.) |
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| Speaker |
Author-1 |
| Date Time |
2023-10-10 15:35:00 |
| Presentation Time |
90 minutes |
| Registration for |
MIKA |
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