A system and method for receiving multiple inbound signals of the same user machine in diversity

Abstract

The invention discloses a system and method for diversity reception of multiple identical user receiver inbound signals. The system comprises a signal processing unit, a gigabit switch and a service processing server. The signal processing unit receives user receiver inbound digital signals and conducts de-spreading, decoding, CRC checking and packaging on the user receiver inbound digital signals and then sends the user receiver inbound digital signals to the service processing server. The service processing server judges CRC identification bits of received user receiver inbound data packets within the receiving time threshold, and if the CRC identification bits of one or more of the multiple identical user receiver inbound signals are indicated to be correct, diversity reception does not need to be performed; if the CRC identification bits of all the multiple identical user receiver inbound signals are indicated to be wrong, the method for diversity reception is adopted. According to the system and method, branch mistakes appearing in signal transmission are corrected through redundant signals, and the purposes that the receiving signal level is increased and the diversity gain is obtained and received are achieved.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a method and a system for receiving and processing inbound signals by a ground center station in a satellite mobile communication system. Background technique [0002] The Beidou satellite short message communication system shares 5 Beidou GEO (Geostationary Earth Orbit, geostationary earth orbit) satellites. Generally, the inbound beams will cover multiple times, such as figure 1 As shown, the inbound signals sent by the user machine in the overlapping area will enter the ground center station through different beams, so the ground center station will receive multiple copies of the same user machine inbound signal. [0003] The receiving process of the user machine inbound signal is as follows: figure 2 shown. Due to the limited power of the satellite's transmitted signal, the signal transmission loss is relatively large, so a large antenna is used for reception ...

AI Technical Summary

Problems solved by technology

However, for satellite mobile communication systems, the time delay difference between inbound signals forwarded by different satellites is large, and multiple identical inbound signals do not arrive at the antenna receiving link at the same time, so the traditional diversity reception method cannot be used

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