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NTT and JAXA successfully test satellite MIMO and IoT technologies
NTT and the Japan Aerospace Exploration Agency (JAXA) have successfully completed orbital demonstration experiments using the LEOMI (Low Earth Orbit MIMO/IoT) device. The tests, conducted on JAXA’s Innovative Satellite Technology Demonstration Mission 4 (RAISE-4), focused on two primary technological advancements.
First, the implementation of MIMO (Multiple-Input Multiple-Output) technology on low Earth orbit satellites demonstrated a significant increase in communication capacity. Compared to traditional single-antenna (SISO) methods, the 2x2 MIMO setup achieved approximately 1.94 times the capacity, while the 3x3 MIMO setup reached up to 2.67 times the capacity. This advancement allows for high-speed transmission of high-definition images and radar data, which is critical for weather, ocean, and disaster monitoring.
Second, the teams verified satellite sensing technology capable of managing large-scale IoT connectivity. The experiment confirmed that a satellite could successfully receive and separate two different 920MHz band LPWA signals transmitted simultaneously from different ground locations on the same frequency. This capability addresses the issue of signal collision and paves the way for a wide-area satellite IoT platform.
These technologies aim to provide connectivity in remote areas such as oceans and mountains where terrestrial networks are unavailable. NTT plans to continue technical establishment through March 2027, with the goal of establishing the technology within fiscal year 2026.
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- [● 2 SOURCES] The experiment confirmed that transmission capacity fluctuation patterns can be estimated with high precision. www.watch.impress.co.jp · prtimes.jp
- [○ 1 SOURCE] Steady operation of the demonstration is scheduled to continue until March 2027. www.watch.impress.co.jp
- [● 3 SOURCES] NTT and JAXA conducted MIMO/IoT demonstration experiments on a low Earth orbit satellite. www.watch.impress.co.jp · internet.watch.impress.co.jp · prtimes.jp
- [○ 1 SOURCE] NTT aims to establish the technology within fiscal year 2026. www.watch.impress.co.jp
- [● 3 SOURCES] The satellite successfully separated and demodulated two 920MHz band LPWA signals transmitted simultaneously from different locations. www.watch.impress.co.jp · internet.watch.impress.co.jp · prtimes.jp
- [● 2 SOURCES] The 3x3 MIMO experiment achieved approximately 2.67 times the communication capacity of single-antenna transmission. internet.watch.impress.co.jp · prtimes.jp
- [● 3 SOURCES] The LEOMI device was launched on the JAXA Innovative Satellite Technology Demonstration Mission 4 (RAISE-4) in December 2025. www.watch.impress.co.jp · internet.watch.impress.co.jp · prtimes.jp
- [● 2 SOURCES] The 2x2 MIMO experiment achieved approximately 1.94 times the communication capacity of single-antenna transmission. internet.watch.impress.co.jp · prtimes.jp