An Iterative Correlated Symbol Timing Estimation Method Based on Block Pilot

Abstract

The invention discloses an iterative correlation symbol timing estimation method based on a block-type pilot frequency, which is mainly used for solving the problems that the traditional symbol timing estimation method is high in complexity and the estimation accuracy is low, and can be applied to a multi-user scene. The method disclosed by the invention comprises the following steps: firstly, removing a cyclic prefix, and carrying out fast Fourier transform, cyclic shift and integrated type sub carrier de-mapping, so as to receive the pilot frequency; secondly, selecting a determined and appropriate receiving pilot frequency and a local pilot frequency thereof through the obtained pilot frequency, and partitioning the receiving pilot frequency and the local pilot frequency thereof; thirdly, by virtue of the partitioned pilot frequency, calculating a first timing error estimation value, and obtaining a corrected pilot frequency by using the first timing error estimation value; fourthly, partitioning the corrected pilot frequency and the local pilot frequency, and calculating a second timing error estimation value; and fifthly, calculating a final timing error estimation value according to the two estimation values. The iterative correlation symbol timing estimation method disclosed by the invention has the advantages that the estimation precision is improved compared with a first path searching algorithm, the division of complex numbers is avoided, the estimation complexity is reduced, and the estimation method disclosed by the invention can be popularized to the multi-user scene of an uplink in LTE.

Description

technical field [0001] The invention belongs to the technical field of high-speed mobile communication, and in particular relates to an iterative correlation timing estimation method, which is suitable for SC-FDMA uplink transmission single-user scenarios in the LTE standard, and can be extended to multi-user scenarios. Background technique [0002] As the long-term evolution LTE standard of the third-generation mobile communication system, its uplink has many advantages such as supporting high-speed data transmission, high spectral efficiency, and high mobility. This is mainly due to the fact that the LTE uplink uses single-carrier frequency division multiple access. SC-FDMA technology. SC-FDMA has the characteristics of low peak-to-average ratio, high spectrum utilization rate, and strong anti-fading capability. However, it is sensitive to timing errors in the case of multiple users. When timing errors occur, it will cause intersymbol interference and affect system perform...

AI Technical Summary

Problems solved by technology

In 2009, Hao Zhou et al. published the paper "AMaximum Likelihood Fine Timing Estimation for Wireless OFDM Systems" in IEEE Transactions on Broadcasting. Based on the channel impulse response, this paper proposed a method for maximum likelihood estimation using the channel autocorrelation matrix. Its estimation accuracy has been greatly improved compared with the first path search algorithm, but it needs channel statistics information, the complexity is very high, and the complexity will increase due to the increase of the maximum timing deviation

In 2014, J.A.Peral-Rosado et al published the paper "Joint maximum likelihood time-delay estimation for LTE positioning in multipath channels" in EURASIP Journal on Advances in Signal Processing, which proposed a hybrid estimation model combining equally spaced taps and arbitrary taps , and use maximum likelihood estimation for timing estimation, the estimation accuracy and precision are greatly improved compared with the first path search algorithm, but the disadvantage is that the complexity is very high

This paper proposes a new pilot-related symbol timing estimation method, but it has special requirements for pilot design and is not suitable for LTE uplink

Images