TD-LTE (Time Division-Long Term Evolution) frequency offset estimation method for relay system

Abstract

The invention provides a TD-LTE (Time Division-Long Term Evolution) frequency offset estimation method for a relay system and relates to services or facilities suitable for a wireless communication network. The method comprises the following steps: obtaining positions of synchronizing signals and information about cell ID (Identity) number and cell group ID number inside a cell identification group from receiving signals at a relay end, so as to obtain a synchronizing signal sequence received by a relay; secondly, generating a local PSS (Primary Synchronization Signal) and an SSS (Secondary Synchronization Signal) according to the obtained relay-end cell ID number and cell group ID number relay end; thirdly, carrying out an integer-frequency-offset estimation process by using the PPS received at the relay end and the obtained relay locally-generated PSS; and finally, carrying out integer-frequency-offset adjustment on the receiving signals of the PSS / SSS at the relay end by using the obtained result epsilon I of the integer-frequency-offset estimation, and carrying out fine-frequency-offset estimation process by using a corresponding algorithm. Therefore, the problem of the frequency offset estimation at the relay end can be solved, and the sending frequencies of the signals received at the relay end and the signals at a base station end are synchronous.

Description

technical field [0001] The technical solution of the present invention relates to a service or facility applicable to a wireless communication network, specifically a method for frequency offset estimation of a TD-LTE relay system. Background technique [0002] TD-LTE is a leap forward in the technology of mobile communication standard, and plays a connecting role in the development of mobile communication system. According to the existing spectrum allocation scheme, the TD-LTE system can obtain a large broadband spectrum in the higher frequency band, but at the same time it also increases the path loss and penetration loss in the high frequency band, resulting in a decrease in the coverage of wireless signals. Therefore, in R10 The protocol introduces relay technology to solve the above problems. In the TD-LTE relay system, Orthogonal Frequency Division Multiplexing (OFDM) technology, which is the core multiple access technology, is very sensitive to frequency offset, and ...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a method for estimating the frequency offset of the TD-LTE relay system, which solves the problem of the uncertainty of the transmission bandwidth of the relay system under the premise of ideal timing synchronization. The problem of frequency offset estimation at the end realizes the frequency synchronization between the signal received by the relay end and the signal sent by the base station

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