Frequency offset estimation and timing method and device

Abstract

The invention discloses a frequency offset estimation and timing method and a frequency offset estimation and timing device. The method comprises the following steps of: performing rough timing on a received signal according to a rough timing scheme to obtain a rough timing result; performing decimal frequency offset estimation based on a repetitive structure of the received signal according to the rough timing result to obtain a decimal frequency offset estimation result; determining a searching window according to an error range of the rough timing result and the positions of ghost peaks produced by integral frequency offsets; and in the searching window, performing integral frequency offset detection on the received signal by utilizing the decimal frequency offset estimation result and at least one integral frequency offset, and obtaining an integral frequency offset estimation result and a precise timing result according to an integral frequency offset detection result. By the method and the device, the influence of the ghost peaks and noises on the frequency offset estimation results can be eliminated, the problem of over-high processing load caused by an irrational searching range in related technologies can be solved, and the frequency offset estimation and timing precision can be effectively improved; and the method and the device can be effectively adapted to scenes with high noises and frequency offsets.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for frequency offset estimation and timing. Background technique [0002] Multi-carrier technology is a high-speed data transmission technology that decomposes a high-speed data stream into several low-speed data streams, and each low-speed data stream is transmitted in parallel on orthogonal sub-carriers. Compared with single-carrier systems, multi-carrier systems It has higher frequency efficiency. Orthogonal Frequency Division Multiplexing (OFDM for short) is a typical multi-carrier system, which introduces a Cyclic Prefix (CP for short), which can effectively overcome the intersymbol caused by multipath fading. crosstalk. OFDM is a core technology of a Long Term Evolution (LTE for short) system and a fourth generation mobile communication system, and is adopted by multiple industrial standards. [0003] Timing and frequency offset estimation are an imp...

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Problems solved by technology

[0013] Aiming at the problems of low frequency offset estimation and timing accuracy and large limitations in the related art, the present invention proposes a method and device for frequency offset estimation and timing, which can effectively improve the accuracy of frequency offset estimation and timing, and can be applied to Scenarios with high noise and large frequency deviation

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