Method and device for jointly estimating frequency deviation and symbol timing deviation

Abstract

The invention discloses a method and a device for jointly estimating frequency deviation and symbol timing deviation. The method comprises the following steps: acquiring a cyclic prefix of a received OFDM symbol, and equally dividing the cyclic prefix into a front part and a rear part to obtain a first data segment and a second segment; acquiring a tail data segment of the OFDM symbol, wherein thelength of the tail data segment is the same as that of the cyclic prefix, and equally dividing the tail data segment into a front part and a rear part to obtain a third data segment and a fourth datasegment; calculating the correlation of complex conjugate of the first data segment and the third data segment to obtain a first correlation value; calculating the correlation of complex conjugate ofthe second data segment and the fourth data segment to obtain a second correlation value; and estimating the frequency deviation and the symbol timing deviation according to the first correlation value and the second correlation value. The method and the device can jointly estimate the frequency deviation and the symbol timing deviation.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a joint estimation method and device for frequency offset and symbol timing offset. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing) is a special multi-carrier transmission technology, which can be regarded as a modulation technology or a multiplexing technology. OFDM technology has been widely used in the field of audio and video since it was proposed, and it has also been rapidly developed and applied in the field of mobile communication. In the LTE (3G Long Term Evolution) standard of 3GPP, OFDM has also become a physical layer standard. [0003] OFDM technology can effectively improve spectrum utilization efficiency, but compared with single carrier system, it also has the disadvantage of being easily affected by frequency deviation and timing deviation. [0004] The frequency deviation is caused by the deviation between the local carrier...

AI Technical Summary

Problems solved by technology

[0006] The estimation methods of frequency offset and symbol timing offset in the prior art mainly include the following types: separately estimate the frequency offset and symbol timing offset, which requires two calculations and waste resources; use the maximum likelihood method to jointly estimate the frequency deviation and symbol timing deviation, this method is more complex to implement; in addition, the training sequence can also be used to jointly estimate the frequency deviation and symbol timing deviation, but this method has poor performance and is more complicated to implement

Images