A Search Method for Downlink Synchronization Signal in Frequency Division Duplex Mobile Communication System

Abstract

The invention discloses a method of searching a frequency division duplex mobile communication system downlink synchronizing signal. The method comprises steps that S1, a radio frequency power amplifier is adjusted according to a yield value controlled by an automatic gain, and receiving data after the adjustment of the radio frequency power amplifier is cached; S2, whether a downlink synchronizing signal exists in the next downlink synchronizing signal transmitting period is detected: when the downlink synchronizing signal is detected, the position of the downlink synchronizing signal and the yield value controlled by the automatic gain are output, and a searching process is quitted, when the downlink synchronizing signal is not detected, a step S3 is executed; S3, whether a completed searching period number reaches a maximum searching period number is determined: when the completed searching period number reaches the maximum searching period number, the identifications of the unsearched downlink synchronizing signals are output, and the searching process is quitted, and when the completed searching period number does not reach the maximum searching period number, the yield value controlled by the automatic gain is adjusted, and the step S1 is executed. By adopting the method, the amplitude of the synchronizing signal is adjusted in a proper range in a short time, and a searching success rate is improved, and searching time is shortened.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a search method for a downlink synchronization signal of a frequency division duplex mobile communication system. Background technique [0002] Modern mobile communication systems are widely deployed to provide various types of communication services, such as voice and data services, and the like. At present, there are terrestrial mobile communication systems (such as GSM, TD-SCDMA and LTE, etc.) and satellite mobile communication systems (such as INMARSAT, etc.) that are more common. In these systems, the user terminal (UE) must first obtain information such as time and frequency of the local network (cell) (also known as line synchronization, cell search or initial cell search) to complete synchronization with the communication network, and then to Other operations continue on the network. The downlink synchronization process is a key physical process of UE, whic...

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Problems solved by technology

However, these methods will significantly increase the complexity of AGC control and implementation, which is too complicated to be used in FDD systems, and some methods are not suitable for FDD systems

[0006] Therefore, there is a need for a downlink synchronization signal search method with a suitable automatic gain control scheme suitable for FDD mobile communication systems, but there is no relevant technical scheme at present

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