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Frequency offset estimation method for ZigBee and system thereof

A technology for frequency offset estimation and signal reception, applied in the field of frequency offset estimation, it can solve the problems of difficult to obtain peak value, inability to obtain peak value easily, and difficult to handle peak plateau, so as to avoid peak plateau, expand the estimation range, and simplify the processing process. Effect

Active Publication Date: 2016-07-06
深圳市极致汇仪科技有限公司
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AI Technical Summary

Problems solved by technology

[0004] The usual frequency offset estimation algorithm using the preamble is: receive data before and after the conjugate multiplication accumulation and peak value to estimate the frequency offset, that is, the received data is multiplied with the length of one symbol and the data conjugate whose interval is an integer multiple of the symbol length Accumulate, after receiving the data shift, repeat the previous steps, and compare the final cumulative sum with the modulus value, take the largest modulus value as the peak value to find the angle, the formula is: Among them, M n is the cumulative sum value obtained; but in the preamble of ZigBee, the data conjugates before and after the multiplication, accumulation and summation will form a platform, such as figure 2 As shown, it is not easy to get obvious peak
[0005] Therefore, in actual processing, it is not easy to deal with this part of the peak platform, and it is impossible to easily obtain an obvious peak

Method used

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  • Frequency offset estimation method for ZigBee and system thereof
  • Frequency offset estimation method for ZigBee and system thereof
  • Frequency offset estimation method for ZigBee and system thereof

Examples

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Embodiment 1

[0032] Such as figure 1 As shown, this example provides a frequency offset estimation method for ZigBee, including the following steps:

[0033] Step S1, when the receiving end receives the ZigBee short burst signal, it intercepts the received ZigBee short burst signal to the preamble signal of the received signal, and each signal in the preamble signal of the received signal is conjugated with the received signal, Then the received signal sequence is obtained;

[0034] Step S2, multiply each signal in the local preamble signal of ZigBee with the local signal after conjugation, and then obtain the local signal sequence;

[0035] Step S3, multiplying the received signal sequence obtained in the step S1 and the local signal sequence obtained in the step S2 to obtain the cumulative sum, and obtain the peak value through the cumulative sum, and finally obtain the frequency offset estimation value

[0036] Step S1 and step S2 described in this example are not sequential steps,...

Embodiment 2

[0044] This example also provides a ZigBee frequency offset estimation system, which adopts the ZigBee frequency offset estimation method described in Embodiment 1.

[0045] This example includes: Figure 4 As shown, the received signal sequence generation module is used to realize the conjugate multiplication between the preamble signal of the received signal and the received signal whose interval is N;

[0046] Such as Figure 5 As shown, the local signal sequence generation module is used to realize the conjugate multiplication between the local leading signal and the local signal whose interval is N;

[0047] Such as Figure 6 As shown, the multiplication and peak value module is used to realize the multiplication and accumulation between the received signal sequence and the local signal sequence, and obtain the frequency offset estimation value through the accumulation and peak value

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Abstract

The invention provides a frequency offset estimation method for ZigBee and a system thereof. The frequency offset estimation method comprises the following steps: S1, when a receiving end receives a ZigBee short burst signal, the receiving end intercepts a leader signal of a receiving signal of the received ZigBee short burst signal, wherein each signal in the leader signal of the receiving signal is subjected to conjugate multiplication by the receiving signal, and thus, a receiving signal sequence is obtained; S2, each signal in the local leader signal of ZigBee is conjugated and then multiplied by a local signal, and thus, a local signal sequence is obtained; S3, the receiving signal sequence obtained in the step S1 is multiplied by the local signal sequence obtained in the step 2 to obtain cumulative sum, a peak value is further solved through the cumulative sum, and finally, a frequency offset estimation value (as Formula) is obtained. With the method and the system provided by the invention, range of frequency offset estimation is expanded, appearance of a peak value platform can be avoided, frequency offset estimation is quick and accurate, and a processing procedure of cumulative summation is simplified.

Description

technical field [0001] The present invention relates to a method for estimating frequency offset, in particular to a method for estimating frequency offset for ZigBee, and to a system for estimating frequency offset using the method for estimating frequency offset for ZigBee. Background technique [0002] In a wireless communication receiver, the data from the radio frequency to the baseband usually has a certain frequency deviation, which will introduce a large error to the subsequent demodulation of the baseband receiver, seriously affecting the bit error rate and packet error rate of the wireless communication receiver. In order to solve this problem, frequency offset estimation and frequency offset correction are usually performed on received data in a wireless communication receiver. In a short burst communication protocol like OQPSK (offset quadrature phase shift keying) modulation of ZigBee, the OQPSK is offset quadrature phase shift keying, generally in the frame str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00H04W84/12
CPCH04L27/0014H04L2027/0026H04W84/12
Inventor 吴帅吴建兵
Owner 深圳市极致汇仪科技有限公司
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