Generalized frequency division multiplexing time and frequency synchronization method for correcting high frequency offset

Abstract

The invention discloses a generalized frequency division multiplexing time and frequency synchronization method for correcting high frequency offset and mainly solves the problem that the synchronization performance is rapidly reduced due to the influence of the high frequency offset in the existing method. The method comprises the specific steps of (1), receiving an electric signal; (2), carryingout rough symbol timing synchronization on a sample sequence; (3), correcting fractional frequency offset of the sample sequence; (4), selecting path candidate timing time; (5), drawing a two-dimensional time and frequency measurement curved surface; (6), estimating path timing time; (7), correcting integer frequency offset of the sample sequence; and (8), estimating first path time of arrival. Compared with the existing method, the method has the advantage that when the high frequency offset exists, carrier frequency synchronization performance and symbol timing synchronization performance are far superior. Compared with an existing generalized frequency division multiplexing (GFDM) system synchronization method, the method has the advantage that a frequency offset estimation range is far wider.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a generalized frequency division multiplexing (GFDM) time-frequency synchronization method for correcting large frequency deviation in the technical field of wireless communication. The invention can be used for carrier frequency synchronization and symbol timing synchronization in a generalized frequency division multiplexing GFDM system, and improves the synchronization performance of the system under fading channels. Background technique [0002] Synchronization is a prerequisite for signal equalization and demodulation. The impact of synchronization error on the bit error rate of the generalized frequency division multiplexing GFDM system is much greater than that of the orthogonal frequency division multiplexing OFDM (orthogonal frequency division multiplexing) system. [0003] The patent application document "GFDM radio transmission using apseudo circular pream...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that since the signal transmission in wireless communication is affected by channel fading, after calculating the cross-correlation between the cyclic prefix and cyclic suffix, the receiving end cannot observe the sharp Dirichlet pulse and cannot find the correct symbol timing synchronization point

The shortcomings of this method are, first, when there is a large frequency offset in the sampling sequence, the cross-correlation between the sampling sequence after correcting the fractional multiple frequency offset and the local preamble will be affected by the integer multiple frequency offset, resulting in The timing of the first path is inaccurate, and the performance of symbol timing synchronization drops sharply; second, the method of Ivan S Gaspar can only estimate the frequency offset within a subcarrier bandwidth by using a preamble sequence, resulting in a waste of spectrum resources

Images