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Frequency offset estimation method and device

A technology of frequency offset estimation and frequency domain, which is applied in the field of frequency offset estimation, can solve the problems of decreased accuracy of frequency offset estimation, difficulty in guaranteeing the law of linear increase, missed detection, etc., and achieves the effect of improving accuracy

Inactive Publication Date: 2015-04-22
COMBA TELECOM SYST CHINA LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, this method requires the phase of the received symbols to meet a linear increase, but due to noise and other reasons, the phase of some received symbols will change abruptly, and the law of linear increase is difficult to guarantee, so when the signal-to-noise ratio is low, there will be a large number of missed detection, resulting in a decrease in the accuracy of frequency offset estimation

Method used

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  • Frequency offset estimation method and device
  • Frequency offset estimation method and device

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Embodiment 1

[0030] like figure 1 As shown, an embodiment of the present invention provides a method for frequency offset estimation, including:

[0031] S101. Detect a frequency burst sequence by using the frequency domain modulus value of the received symbol.

[0032] In an implementation manner of the embodiment of the present invention, such as figure 2 As shown, an implementation manner of using the frequency domain modulus value of the received symbol to detect the frequency burst sequence is as follows, specifically including:

[0033] S201. Set a sliding window on the initial received symbol sequence, where the sliding window is used to extract the received symbol sequence used for frequency burst detection.

[0034] The value of the length N of the sliding window may be 8, 16, 32, etc.

[0035] S202. Perform FFT change on the received symbol sequence located in the sliding window, and calculate the modulo value of the received symbol sequence in the frequency domain.

[0036]...

Embodiment 2

[0106] An embodiment of the present invention provides a frequency offset estimation device, such as Figure 4 shown, including:

[0107] The frequency burst sequence detection module S11 is used to detect the frequency burst sequence by using the frequency domain modulus value of the received symbol;

[0108] A first frequency offset estimation compensation module S12, which uses the frequency burst sequence to calculate a first frequency offset estimation value, and compensates the frequency burst sequence according to the first frequency offset estimation value;

[0109] The phase normal symbol sequence extraction module S13 is configured to perform phase jump symbol detection on the compensated frequency burst sequence to obtain a phase normal symbol sequence, where the phase normal symbol sequence is a continuous period of normal phase symbols, and the A symbol with a normal phase is that the phase of one symbol and the phase of the adjacent symbol before it conforms to ...

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Abstract

The embodiment of the invention relates to the technical field of communications and provides a frequency offset method and device to improve the accuracy of frequency offset estimation. The method comprises the following steps of: 101, detecting a frequency burst sequence by using a frequency domain modulus value of a received symbol; 102, calculating a first frequency offset estimated value by using the frequency burst sequence, and compensating the frequency burst sequence according to the first frequency offset estimated value; 103, detecting a phase jumping symbol of the compensated frequency burst sequence to obtain a symbol sequence with normal phase change; 104, performing phase processing on phase variation symbols at two ends of the symbol sequence with normal phase change in the compensated frequency burst sequence; and 105, calculating a precise frequency offset estimated value by using the frequency burst sequence after phase processing. The method and device provided by the embodiment of the invention are applied to a frequency offset estimation process.

Description

technical field [0001] The present invention relates to the field of communication technologies, and in particular, to a method and device for frequency offset estimation. Background technique [0002] In a mobile communication system, the carrier frequency of the receiver is likely to be inconsistent with the carrier frequency of the transmitter. In this case, the receiver needs to use the information sent by the transmitter to detect the carrier frequency offset between the receiver and transmitter, and then adjust the receiver. The carrier frequency of the terminal is locked to ensure the reliable transmission of communication. [0003] In the prior art, a commonly used method for estimating a carrier frequency offset is to use the phase difference caused by the frequency offset between different symbols to estimate the frequency offset. The basic principle of the method is to send the same symbol at different times, and then The different phase differences caused by the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L25/03
Inventor 黄忠付杰尉
Owner COMBA TELECOM SYST CHINA LTD
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