User channel satellite capture method based on WCDMA (Wideband Code Diversion Multiple Access) system

Abstract

The invention relates to a user channel satellite capture method based on a WCDMA (Wideband Code Diversion Multiple Access) system, comprising the following steps of: firstly screening access users out according to signing information of a PRACH (Physical Random Access Channel) access preamble on a wave beam access slot; then determining that a wave beam that each access user locates is a principle wave beam or a spanning wave beam; if the wave beam is the principle wave beam, determining the search starting time and a search interval of DPCH (Dedicated Physical Channel) channels corresponding to the access users by utilizing signing phases, searching the single-path retardation of the DPCH channels corresponding to the access users in the principle wave beam in the search interval, and then carrying out scrambling code tracking on the DPCH channels; and if the access users are the spanning wave beam access users, distributing the DPCH channels in the principle wave beam, determining the search starting time and a search interval of the DPCH channels corresponding to the spanning wave beam access users in the principle wave beam by taking the reference time of the principle wave beam as a reference, searching the single-path retardation of the DPCH channel corresponding to the spanning wave beam access users in the principle wave beam in the search interval, and then carrying out scrambling code tracking on the DPCH channels.

Description

technical field [0001] The invention belongs to the field of satellite communication, and relates to a user channel on-board acquisition method for 3G communication on-board reception based on the WCDMA system. Background technique [0002] Considering the characteristics of the GEO (Geosynchronous Earth Orbit) satellite mobile communication system, as well as the limitations of power consumption and volume on the satellite, the access processing method on the satellite is different from that of the ground system. [0003] At present, there is no satellite communication system that adopts the WCDMA system and processes it on the satellite. In the terrestrial WCDMA mobile system, user channel acquisition includes PRACH (Physical random access channel) acquisition and DPCH (Dedicated Physical Channel downlink dedicated physical channel) acquisition, but there is no direct connection between the two acquisitions . Because for the ground, the channel environment is complex and...

AI Technical Summary

Problems solved by technology

Therefore, multipath processing becomes insignificant. If the method of multiple separate acquisitions is adopted as in the ground mobile communication system, a complex acquisition structure and a large number of redundant hardware resources will be introduced.

It can be seen that the method of multiple separate captures is not suitable for the characteristics of the satellite channel, and at the same time, it is not feasible due to the strict constraints of power consumption and volume on the satellite.

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