Mobile Broadcasting Satellite (MBSAT) is a satellite system operated by the Japanese Mobile Broadcasting Corporation (MBCO), designed to deliver digital audio broadcasting and other multimedia services to mobile users. This technology utilizes MPEG-2 data containers for transmitting information. For audio coding, it employs MPEG-2 AAC, and for video coding, MPEG-4 is used. This combination allows for the delivery of high-quality audio equivalent to CD quality and video quality comparable to TV standards, along with various types of data services. MBSAT has the capacity to broadcast more than 50 programs simultaneously.

The MBSAT system utilizes the S-band spectrum, specifically the frequency range of 2,630-2,655 MHz, for broadcasting signals to mobile users. To enhance coverage in urban and other areas where direct satellite signal reception may be challenging, terrestrial gap-fillers are deployed. The satellite itself is equipped with 16 transponders, all operating within the same frequency band through the use of Code Division Multiplexing (CDM). This technology enables efficient data transmission to mobile devices across a wide area.