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Frequency deviation estimating method and system

A frequency deviation and estimation module technology, applied in the field of communication systems, can solve problems such as difficult blind estimation, high complexity, and large amount of computation

Active Publication Date: 2010-06-16
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Abstract
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Problems solved by technology

[0006] However, the inventors of the present invention have found that since the traditional frequency offset estimation method needs to calculate the autocorrelation function of the conjugate product of the received signal and the transmitted signal, the amount of calculation is large and the complexity is high, thus requiring higher hardware
Moreover, it is difficult to achieve blind estimation due to the need to use the pilot frequency and know the specific pilot signal

Method used

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  • Frequency deviation estimating method and system

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Embodiment Construction

[0042] In the following description, many technical details are proposed in order to enable readers to better understand this application. However, those of ordinary skill in the art can understand that even without these technical details and various changes and modifications based on the following embodiments, the technical solutions required by the claims of this application can be implemented.

[0043] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0044] The first embodiment of the present invention relates to a frequency deviation estimation method. In this embodiment, the peak-to-average ratio of each signal in the Zadoff-Chu sequence is used to estimate the frequency deviation. Since in a Long Term Evolution (Long Term Evolution, "LTE") network, the Zadoff-Chu sequence is usually used for ...

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Abstract

The invention relates to a communication system and discloses frequency deviation estimating method and system. In the invention, a Zadoff-Chu sequence is extracted from a received signal, and a peak-to-mean ratio of signals in the Zadoff-Chu sequence is utilized to estimate a frequency deviation (namely frequency offset), thereby avoiding converting a frequency deviation estimating problem into a single frequency estimating problem, thus the invention has small operand, lower complexity and convenient ASIC realization. Moreover, because a concrete pilot frequency signal does not need to be known, blind estimation can be realized.

Description

Technical field [0001] The present invention relates to a communication system, in particular to a frequency calibration technology in a communication system. Background technique [0002] In recent years, the multi-carrier transmission technology represented by Orthogonal Frequency Division Multiplexing (OFDM for short) has attracted widespread attention. Multi-carrier transmission decomposes the data stream into several independent sub-data streams, and each sub-data stream will have a much lower bit rate. The low-rate multi-state symbols formed by such a low bit rate are used to modulate the corresponding subcarriers to form a transmission system in which multiple low-rate symbols are sent in parallel. [0003] The OFDM system uses the encoded data to be transmitted as frequency domain information, modulates it into a time domain signal, and transmits it on the channel, and performs reverse process demodulation at the receiving end. The modulation and demodulation of the OFDM ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04J11/00
Inventor 魏华
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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