Method and device for frequency offset estimation of multi-carrier communication system based on OFDM
A technology for multi-carrier communication and frequency offset estimation, which is applied in the field of frequency offset estimation of communication systems and can solve the problems of low precision and multiple noise components.
Active Publication Date: 2018-11-16
NO 30 INST OF CHINA ELECTRONIC TECH GRP CORP
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However, since the OFDM training symbol length is usually much larger than the multipath length, the original received signal contains more noise components, making the frequency offset estimation less accurate
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[0073] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0074] The embodiment of the present invention discloses an OFDM-based multi-carrier communication system frequency offset estimation method, see figure 1 As shown, the method includes:
[0075] Step S11: Generate two consecutive pilot symbols, and transmit the above two consecutive pilot symbols from the signal sending end to the signal receiving end through the channel, so as to obtain corresponding two original received signals on the signal receiving end. ...
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The invention discloses an orthogonal frequency division multiplexing (OFDM) based multi-carrier communication system frequency offset estimation method and apparatus. The method comprises the steps of generating two successive pilot symbols, and transmitting the two successive pilot symbols from a signal transmitting end to a signal receiving end through a channel, so as to acquire two corresponding original receiving signals on the signal receiving end; performing channel estimation by use of the two original receiving signals separately, so as to obtain two groups of channel estimation vectors correspondingly; performing one-time time frequency conversion on each of the two groups of channel estimation vectors and performing noise filtering on results of the primary time frequency conversion so as to obtain two groups of time domain vectors correspondingly after filtering; and performing two times of time frequency conversion on each of the two groups of time domain vectors after filtering, and estimating frequency offset by use of results of the two times of time frequency conversion, so as to obtain a frequency offset estimation value. Through adoption of the method and apparatus, noise component in the original receiving signals is filtered, so that subsequent frequency offset estimation accuracy is improved.
Description
technical field [0001] The present invention relates to the technical field of frequency offset estimation of communication systems, in particular to an OFDM-based multi-carrier communication system frequency offset estimation method and device. Background technique [0002] In a multi-carrier communication system based on OFDM (OFDM, Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing), information is carried on multiple narrower carriers. The relative movement of the information receiving end or the inconsistency of the crystal oscillator of the transceiver will cause a carrier frequency offset, which will easily damage the orthogonality of the subcarriers, form inter-carrier interference, and reduce system performance. Therefore, one needs to estimate the frequency offset. [0003] At present, the commonly used frequency offset estimation method is to estimate the frequency offset by analyzing the changes between two repeatedly transmit...
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IPC IPC(8): H04L27/26
CPCH04L27/2695
Inventor 隋天宇乐强肖飞郭强郭强胜杨建平
Owner NO 30 INST OF CHINA ELECTRONIC TECH GRP CORP