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Time division duplexing-long term evolution (TDD-LTE) downlink synchronizing method

A frame synchronization and auxiliary synchronization technology, applied in the multi-frequency code system and other directions, can solve the problems of heavy system burden and huge calculation amount in the auxiliary synchronization process, and achieve the effect of reducing the system burden and reducing the amount of calculation.

Inactive Publication Date: 2013-01-02
SHENZHEN WINHAP COMM
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Problems solved by technology

[0004] The purpose of the embodiment of the present invention is to provide a TDD-LTE downlink synchronization method, aiming to solve the problem that the secondary synchronization process of the existing TDD-LTE downlink synchronization method has a huge amount of calculation, resulting in a large system burden

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  • Time division duplexing-long term evolution (TDD-LTE) downlink synchronizing method
  • Time division duplexing-long term evolution (TDD-LTE) downlink synchronizing method
  • Time division duplexing-long term evolution (TDD-LTE) downlink synchronizing method

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Embodiment Construction

[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0029] In the embodiment of the present invention, in the secondary synchronization process of TDD-LTE system downlink synchronization, the corresponding even sequence and odd sequence are obtained by deinterleaving and descrambling the received signal, so as to complete the cross-correlation process between the secondary synchronization signal and the received signal, Therefore, the calculation amount of the secondary synchronization process is greatly reduced, and the system burden is lightened.

[0030] The downlink synchronization process of the TDD-LTE system is a process in which a user equip...

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Abstract

The invention is applicable to the field of Time division duplexing-long term evolution (TDD-LTE) system communication and provides a TDD-LTE downlink synchronizing method. The method includes obtaining half-frame synchronization information and serial numbers in a cell identity (ID) group; determining a cyclic prefix (CP) type; subjecting a frequency domain secondary synchronization sequence to de-interleaving and descrambling to obtain an even sequence and an odd sequence respectively; subjecting the even sequence and a secondary original sequence to circular correlation and recording a coordinate corresponding to a peak value of correlation values as a first displacement coordinate; generating a third descrambling sequence according to the first displacement coordinate; descrambling the odd sequence and the third descrambling sequence, subjecting the odd sequence, the third descrambling sequence and the secondary original sequence to circular correlation, and recording a coordinate corresponding to a peak value of correlation values as a second displacement coordinate; and obtaining a cell ID group serial number and frame starting information according to the first displacement coordinate and the second displacement coordinate. According to the TDD-LTE downlink synchronizing method, m<0> and m<1> can be determined only by performing 31 times of cross-correlation calculation with the length of 31, so that TDD-LTE downlink synchronization information is obtained, and the calculation amount is greatly reduced.

Description

technical field [0001] The invention belongs to the field of long-term evolution system (Time Division Duplexing-Long Term Evolution, TDD-LTE) communication in time division duplex mode, and in particular relates to a TDD-LTE downlink synchronization method. Background technique [0002] The physical layer of the LTE system adopts Orthogonal Frequency Division Multiplexing (OFDM) modulation technology, in which the OFDM symbol is composed of multiple subcarrier signals superimposed, and each subcarrier is distinguished by orthogonality, so The TDD-LTE system is very sensitive to the frequency offset of the signal. However, in practical applications, due to the frequency deviation of the RF crystal oscillator at both ends of the transceiver and the Doppler frequency shift generated by the mobile station in a high-speed mobile environment, the orthogonality between subcarriers will be destroyed, and then the subcarriers will be introduced. Interference, resulting in a signifi...

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Application Information

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IPC IPC(8): H04L27/26
Inventor 曾刚举张鹏王德强
Owner SHENZHEN WINHAP COMM
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