KEYWORDS: Telecommunications, Satellites, Satellite communications, Data communications, Receivers, Human-machine interfaces, Visualization, Satellite navigation systems, Navigation systems, FDA class II medical device development
Beidou satellite communication system has the function of short message transmission. The traditional short message "broadcast" function is to use Beidou command aircraft to bind with subordinate end users for "broadcast", which has poor timeliness. This paper designs a short message "broadcast" system using Beidou multi card machine, and carries out data processing at both the sending end and the receiving end, so that it can adapt to various external systems. Through practical verification, when the number of user terminals is not too many, the success rate and timeliness are greatly improved compared with the traditional system.
When the traditional LT code is used for encoding and decoding, if there is no encoded packets with degree 1 in the remaining encoded groups, the decoding will stop and the decoding cannot be continued. That will affects the decoding efficiency. For this reason, this paper proposes an improved enhanced decoding method. When BP decoding stops, the remaining coded packets will be decoded using the secondary decoding method, which can improves the success rate of decoding.
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