A frequency offset estimation method based on the combination of pss and sss in 5g system
A frequency offset estimation, 5G technology, applied in transmission systems, digital transmission systems, modulated carrier systems, etc., can solve problems such as inability to balance estimation accuracy and range, susceptibility to noise and multipath, and reduce the range of frequency offset estimation , to achieve high practical value, eliminate polarity inversion, and estimate the effect of a large range
Active Publication Date: 2022-04-12
CHONGQING UNIV OF POSTS & TELECOMM
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[0004] The frequency offset estimation algorithm based on cyclic prefix (CP) has a frequency offset estimation range of [-7.5KHZ, 7.5KHZ], but the frequency offset estimation value of this algorithm is easily affected by noise and multipath, and the estimation accuracy is not high. The frequency offset estimation algorithm based on the primary synchronization signal (Primary Synchronization Signal, PSS) and secondary synchronization signal (Secondary Synchronization Signal, SSS) frequency offset estimation range is [-7KHZ, 7KHZ], the frequency offset estimation value of the algorithm is not susceptible to noise, multiple However, the estimation accuracy is not high, or when the frequency offset estimation range is reduced, when the frequency estimation value is close to the edge of the frequency offset estimation range, it is easy to cause the polarity reversal of the estimated frequency offset estimation result, so that the final estimation result will be wrong
[0005] The traditional frequency offset estimation algorithm cannot take into account the estimation accuracy and range, and many frequency offset estimation algorithms based on training sequences increase the frequency offset accuracy, but greatly increase the computational complexity
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[0034] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic concept of the present invention, and the following embodiments and the features in the embodiments can be combined with each other in the case of no conflict.
[0035] see Figure 1 ~ Figure 2 , figure 1 It is a frequency offset estimation method based on the combination of PSS and SSS in a 5G system. First, the fre...
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The invention relates to a frequency offset estimation method based on the combination of PSS and SSS in a 5G system, belonging to the field of wireless communication. The method first calculates the frequency offset freq_ps based on the correlation between the PSS signal and the SSS signal in the first SSB block in the same time slot; then uses the PSS signal and the second SSB in the first SSB block in the same time slot Calculate the frequency offset freq_sp of the SSS signal in the block; finally use freq_ps to modify freq_sp to obtain the final frequency offset freq. The accuracy of frequency offset estimation is further improved while the frequency offset estimation range remains unchanged; it does not occupy additional frequency band resources; it is less affected by interference such as noise and multipath, and eliminates the polarity inversion in the traditional joint frequency offset estimation algorithm.
Description
technical field [0001] The invention belongs to the field of wireless communication, and relates to a frequency offset estimation method based on the combination of PSS and SSS in a 5G system. Background technique [0002] As a key technology in wireless communication, Orthogonal Frequency Division Multiplexing (OFDM) has the advantages of high utilization of spectrum resources and strong anti-fading ability, but its obvious disadvantage is that it does not affect the regularity between subcarriers. Intercourse has strict requirements. However, the carrier frequency offset will destroy the orthogonality between the sub-carriers, resulting in Inter-Channel Interference (ICI), which seriously degrades the performance of the receiver. Therefore, the frequency offset must be estimated and compensated at the receiving end. [0003] Existing frequency offset estimation methods are divided into integer frequency offset estimation (Integer Frequency Offset, IFO) method and fractio...
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IPC IPC(8): H04L27/00
CPCH04L27/0014H04L2027/0026
Inventor 席兵高尚蕾张治中段浴钟储苓王昊孙倩楠
Owner CHONGQING UNIV OF POSTS & TELECOMM