LTE (long term evolution) synchronization signal detection method

Abstract

The invention discloses an LTE (long term evolution) synchronization signal detection method in the technical field of communication. The LTE synchronization signal detection method comprises the following steps of: when a primary synchronization signal is detected, firstly adding three local primary synchronization sequences, carrying out correlation operation on the addition and a receiving sequence, determining a peak value position, obtaining a primary synchronization signal position, determining a sign timing position, and further obtaining a section mark; and when a secondary synchronization signal is detected, firstly determining a secondary synchronization signal position, obtaining a duplex mode and a circulation prefix type adopted by a system, determining a local secondary synchronization signal sequence by utilizing the section mark obtained by detecting the primary synchronization signal, carrying out correlation operation on the local secondary synchronization signal sequence and the receiving sequence, and obtaining a frame timing synchronization and cell group mark to obtain a physical layer cell mark. According to the LTE synchronization signal detection method disclosed by the invention, computational load of synchronization detection is reduced by more than 60%, the calculating speed of synchronization detection is accelerated, the service quality is improved, cells can be quickly searched in handoff, especially in a high-speed mobile environment, and the drop call rate is reduced.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a method for detecting an LTE synchronization signal. Background technique [0002] With the continuous development of mobile communication and broadband wireless access technology, Long Term Evolution (LTE) technology has become the mainstream technology of the new generation of mobile communication due to its high transmission rate, small user plane delay and support for high-speed mobile terminals. . For a cellular mobile communication system, cell search is the first step for a mobile terminal to access a wireless network, and is one of the most basic procedures at the physical layer. When the terminal is turned on for the first time to access the cell and handover, it needs to perform cell search to establish time-frequency synchronization, obtain the physical layer cell identity and other system configuration information, and only after accessing the cell...

AI Technical Summary

Problems solved by technology

[0013] The deficiencies of the existing technology in the detection process of the primary synchronization signal PSS are as follows: on the one hand, due to the large number of sample points of the received signal sequence, and the need to correlate the received signal with the three local primary synchronization signal PSS sequences respectively, a huge amount of calculation is required ; On the other hand, during the detection process of the secondary synchronization signal SSS, the position between the secondary synchronization signal SSS and the primary synchronization signal PSS will change with different duplex modes and cyclic prefix types, and the receiving end needs to be in four possible positions Blind detection of the secondary synchronization signal SSS will also make the calculation complicated

The huge amount of calculation will slow down the synchronization signal detection process, reduce the cell search speed, affect the access efficiency, and increase the call drop rate in handover, especially in high-speed mobile environments

[0014] Due to the huge amount of calculation of the current synchronization detection algorithm, the cell search process is slow. The main purpose of the present invention is to reduce the computational complexity of synchronization signal detection and speed up the cell search process.

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