Synchronous detection method for TD-LTE (time division long term evolution) network optimized equipment

Abstract

The invention provides a synchronous detection method for TD-LTE (time division long term evolution) network optimized equipment. The synchronizing with a base station is finished by fully using the hardware (mainly comprising an FPGA (field programmable gate array) and a CPU (central processing unit)) of the existing network optimized equipment. The method comprises the steps that a near end generates a synchronous switch signal according to an input signal and transmits the switch signal to each far end; each far end controls a radio frequency switch to realize uplink-downlink switching according to the switch signal. As the CPU is not a special signal processing chip, the CPU cannot realize real-time treatment under the condition of larger delay (time for calculating SSS once is at second level) and an LTE (long term evolution) semi-frame being 5ms long when massive data are processed. The method adopts an asynchronous calculation mode, so the demand on real-time property is reduced. The demand on the real-time property of the CPU is not high, a GPS (global positioning system) module and a modem do not need to be connected, the equipment cost is reduced, and the structure is more compact.

Description

[0001] technical field [0002] The invention belongs to the technical field of communication, and in particular relates to a synchronization detection method of a TD-LTE network optimization device. Background technique [0003] The TD-LTE system is a time division duplex mode, and the uplink and downlink share the same frequency band. Therefore, in order for the TD-LTE network optimization equipment to work normally, it must first obtain synchronization information from the base station signal. Perform accurate switching to ensure that the uplink and downlink signals can be fully amplified by the network optimization equipment. [0004] At present, there are two main synchronization methods for TD-LTE network optimization equipment: GPS synchronization and demodulation synchronization. The use of GPS synchronization method first increases the system cost, especially the current price of LTE modem is relatively expensive; When the GPS or modem needs to be placed in the...

AI Technical Summary

Problems solved by technology

[0004] At present, there are two main synchronization methods for TD-LTE network optimization equipment: GPS synchronization and demodulation synchronization. The GPS synchronization method first increases the system cost, especially the LTE modem is currently relatively expensive; the existing technology is used to form a final product At the same time, GPS or modem needs to be placed in the chassis, which will increase the size of the chassis, as well as increase the power supply and RF coupling connection, and the structure is not compact

Secondly, the installation location of the network optimization device must meet the requirements of GPS to be able to synchronize normally, so that it cannot be applied in some indoor coverage scenarios, and the device cannot work when the GPS cannot receive signals under certain harsh conditions; Solution The method of adjusting synchronization is mainly realized by using a modem with a TD-LTE baseband processing chip. After the modem couples a part of the input signal to complete the synchronization, it directly outputs the switching signal for the device to use.

At present, the cost of the existing TD-LTE baseband chip is relatively high, which also increases the system cost

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