Mobile satellite broadcasting system and method for realizing multimedia business transmission

Abstract

This invention discloses a mobile satellite broadcast system and a method for realizing multimedia service transmission including: applying the OFDM technology to modulate input signals, which increases the usability of spectrum, besides, this invention applies LDPC mode for coding and the APSK technology for constellation mapping to further increase the usability of spectrums.

Description

technical field [0001] The invention relates to the communication field, in particular to the mobile satellite broadcasting technology. Background technique [0002] At present, with the emergence of various high-bandwidth multimedia services, such as video conferencing, TV broadcasting, video-on-demand, and advertisements, people are no longer satisfied with browsing the Internet through simple mobile phones, but for mobile multimedia services, such as mobile video services. The demand is increasing day by day. [0003] In order to provide the mobile multimedia services, especially mobile TV services, technically, there are two feasible solutions: one is to carry mobile video content through the 3G network, which is equivalent to the value-added services of mobile operators; Carrying mobile video content, this solution requires independent network construction. [0004] The mobile satellite broadcasting system refers to a communication system that provides mobile satellit...

AI Technical Summary

Problems solved by technology

Therefore, there is the same technical problem of lower spectrum utilization rate as in the prior art

[0023] 2. Since CDM is used for modulation, in the CDMA system, the downlink can support multiple modulations, but the symbol modulation methods of each link must be the same, while the uplink does not support multiple modulation methods, which makes CDMA system loses certain flexibility when modulating

[0024] 3. In this non-orthogonal link, users using high-order modulation will inevitably generate a lot of noise interference to users using low-order modulation; at the same time, CDMA systems using single-carrier modulation technology have poor anti-multipath ability , so when the existing technology adopts CDM modulation, the spectrum utilization rate is low

[0026] It can be seen from the prior art 4 that because it uses WCDMA for modulation, and the uplink of the WCDMA system, like the CDMA system, does not support multiple modulation methods, and the single-carrier modulation technology leads to poor anti-multipath ability, so The fourth existing technology has the same technical defects as the third existing technology, that is, the technical problems of inflexible system modulation and low spectrum utilization

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