Method and device for estimating frequency deviation
A technology of frequency offset estimation and frequency offset compensation, which is applied in the field of communication, can solve problems such as large errors, limited accuracy of frequency offset estimates, and influence on cell search performance, and achieve the effect of less errors and improved performance
Active Publication Date: 2013-06-05
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology
[0015] However, due to the limited time occupied by the PSC sequence in the PSCH, the accuracy of the frequency offset estimate obtained by using the PSC sequence for rough frequency offset estimation is limited
In the case of a poor channel environment, large errors often occur. Although the accuracy can be improved by methods such as multi-frame averaging, it still cannot completely solve the problem of excessive coarse frequency offset estimation errors.
Since the coarse frequency offset estimation error exceeds the estimation range of the fine frequency offset estimation process, the final frequency offset estimation error will be very large. If the result of the frequency offset estimation is used for data compensation, the subsequent signal demodulation will not be performed correctly. etc., thereby greatly reducing the success probability of cell search and seriously affecting cell search performance
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[0036] Embodiments of the present invention provide a frequency offset estimation method and device, as well as a cell search method and terminal, to avoid the problem that the frequency offset estimation error exceeds the fine frequency offset estimation range during the coarse synchronization process, thereby effectively improving the performance of the cell search .
[0037] The technical solution proposed by the embodiment of the present invention can effectively improve the performance of PSC coarse synchronization estimation, effectively avoid the situation that the frequency offset estimation error in the coarse synchronization process exceeds the fine frequency offset estimation range, and quickly realize frequency offset synchronization.
[0038] The embodiment of the present invention corrects the rough frequency offset estimation result once, thereby effectively improving the result of the rough frequency offset estimation, greatly reducing the probability that the e...
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The invention discloses a method and a device for estimating frequency deviation. The frequency deviation estimating method provided by the invention comprises the steps: a terminal performs correlative calculation on data received from a base station, and a primary synchronous signal PSC (primary synchronization code) sequence, the PSC sequence sent by the base station is determined according toa maximal correlation value, and the PSC sequence sent by the base station is used for estimating frequency deviation so as to obtain an initial frequency deviation estimating value; the terminal corrects the initial frequency deviation estimating value by a preset correction value so as to obtain a corrected frequency deviation estimating value sequence; and the terminal selects the ultimate frequency deviation estimating value from the corrected frequency deviation estimating value sequence.
Description
technical field [0001] The present invention relates to the field of communication technologies, in particular to a frequency offset estimation method and device. Background technique [0002] In the long-term evolution (LTE) system, the base station sends the cell information to the terminal (UE) through the primary synchronization channel (PSCH) and the secondary synchronization channel (SSCH). The information carried by the PSCH is the primary synchronization signal (PSC), and the SSCH carries The information is the Secondary Synchronization Signal (SSC). Through its own series of processing, the UE can obtain the information carried by PSCH and SSCH, complete time and frequency synchronization, and then receive the broadcast information of the base station, obtain the system information of the base station, and complete the process of initial cell search. [0003] The frequency synchronization process is generally divided into a coarse synchronization process and a fine...
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IPC IPC(8): H04B1/7083
Inventor 石蕊张凌雁
Owner DATANG MOBILE COMM EQUIP CO LTD