Method and device for frame synchronization and frequency offset estimation applied to wireless communication

Abstract

The invention provides a frame synchronizing method and device used for wireless communication. The frame synchronizing method comprises the steps of: selecting at least one symbol of a short leader sequence, and equally dividing the sampling points of the selected symbol into a front group and a rear group; exchanging the real part and virtual part of one group of sampling points, and transmitting signals out after processing; carrying out related operation to the short leader sequence, obtaining a related value sequence, and judging whether at least two related value peaks exist in the related value sequence, wherein the interval between the related value peaks is half of the interval among other related value peaks; and if at least two related value peaks exist in the related value sequence, determining the frame synchronizing point according to the time of a clock corresponding to the two related value peaks. The invention also provides a frequency offset estimating method and device used for wireless communication. In the frame synchronization method and device and the frequency offset estimation method and device disclosed by the invention, the frame synchronizing detection is more accurate and promptly and the system complexity of frequency offset estimation is reduced through data processing of the short leader sequence.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method for estimating frame synchronization and carrier frequency offset applied to wireless communication and a corresponding device. Background technique [0002] Wireless communication is the product of the combination of computer network and wireless communication technology. Because the network is not bound by cables and has strong mobility, it is widely used in corporate offices, school libraries, public activities, etc. It can realize various functions such as portable networking, remote access, fax, e-mail, etc., and is more and more popular among people. [0003] However, technically, the realization of wireless communication is more complicated than that of wired network. Since the wireless communication uses packet burst mode to transmit data, after the data packet starts to be transmitted, the receiving end needs to detect the synchronization...

AI Technical Summary

Problems solved by technology

However, due to the existence of noise, the calculated correlation values ​​may have multiple values ​​higher than the threshold, and the intervals of these correlation values ​​may also be equal. At this time, these correlation values ​​cannot represent the real correlation peaks, resulting in synchronization point detection error

In addition, since the OFDM system uses multiple sub-channels to transmit data, the noise in the channel will easily shift the carrier frequency, and the carrier frequency offset will cause inter-channel interference (ICI), so the carrier frequency offset must be estimated to correct the carrier frequency

In the prior art, the estimation of frequency offset is usually performed using one symbol of the short preamble, which increases the complexity of the system

Images