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Digital signal frequency offset estimation method and device for Bluetooth system

A frequency offset estimation and digital signal technology, applied in baseband system components and other directions, can solve the problems that are not conducive to improving the sensitivity of the Bluetooth system receiver and the ability to resist adjacent channel interference, and achieve good frequency offset estimation performance and reduce dynamic range. desired effect

Active Publication Date: 2015-03-25
ALLWINNER TECH CO LTD
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method and device for estimating the frequency offset of digital signals in the Bluetooth system in view of the deficiencies of the prior art, which overcomes the disadvantages of improving the reception of the Bluetooth system by using the signal in the preamble field for frequency offset estimation in the prior art. Defects in the sensitivity of the machine and the ability to resist interference from adjacent roads

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  • Digital signal frequency offset estimation method and device for Bluetooth system
  • Digital signal frequency offset estimation method and device for Bluetooth system
  • Digital signal frequency offset estimation method and device for Bluetooth system

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Embodiment Construction

[0026] like figure 1 As shown, Bluetooth uses 625us as a time slot to send data, including BR / EDR / LE three formats, where the preamble of BR / EDR is 4bit, and LE is 8bit, which is used for frequency synchronization / timing synchronization / AGC (which can be considered as LE The ACCESS CODE is composed of Preamble and AccessAddress).

[0027] like figure 2 As shown, the ACCESS CODE part of Bluetooth adopts GFSK (Gaussian Frequency Shift Keying). Gaussian Frequency Shift Keying (GFSK) is a continuous phase frequency shift keying (CPFSK) modulation technology, which adds a Gaussian filter for prefiltering.

[0028] Ideally, the eye diagram of the transmitted signal is as follows image 3 Shown (Ft is the signal carrier frequency),

[0029] During actual reception, there will be an error between the clock at the receiving end and the clock at the sending end, so there will be a residual frequency offset fo when the received signal is down-converted to 0 frequency. In addition, ...

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Abstract

The invention discloses a digital signal frequency offset estimation method and device for a Bluetooth system. The method comprises the following steps that the odd number of binary sequence pairs are searched for in all fields of a Bluetooth standard data packet, the binary sequence pairs comprise a first binary sequence and a second binary sequence, the first binary sequence and the second binary sequence are radix-minus-one complements of each other, and the binary sequence pairs are prestored; frequency of each digital signal of the corresponding field in the received Bluetooth standard data packet is calculated to generate a binary digit, and the binary sequence pairs are searched for in the binary digits; if the binary sequence pairs exist, a frequency sum value of a half of the frequency corresponding to the middle digit in the first binary sequence and a half of the frequency corresponding to the middle digit in the second binary sequence is calculated. The method is simple and efficient, has better frequency offset estimation performance, can be applied to the Bluetooth system of dynamic AGC, and lowers the requirements for the gain range of a radio frequency module and the dynamic range of modulus conversion.

Description

technical field [0001] The invention relates to the technical field of bluetooth, in particular to a method and device for estimating frequency offset of a digital signal in a bluetooth system. Background technique [0002] In a communication system, the received signal will have a certain frequency offset due to the asynchronous clock between the receiver and the transmitter. To synchronize and receive data correctly, the receiver needs to perform frequency offset of the received signal. Estimates and Compensation. [0003] In the field of Bluetooth technology, the prior art uses the signal in the preamble field to estimate the frequency offset, requiring AGC (Automatic Gain Control) to be in a stable state. This method has high requirements on the gain range of RF (radio frequency module) and the dynamic range of ADC (analog-to-digital conversion), and is not conducive to improving the sensitivity of the receiver and the ability to resist adjacent channel interference. ...

Claims

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Application Information

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IPC IPC(8): H04L25/02
Inventor 罗润树周一文
Owner ALLWINNER TECH CO LTD
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