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Method and system for eliminating carrier frequency offset of reference period signal based on Bluetooth fixed frequency expansion

A technology of carrier frequency offset and signal expansion, which is applied in the direction of modulation carrier system, transmission system, carrier adjustment, etc., can solve the problems of sampling data phase offset, angle estimation deviation of incoming wave direction, etc., and achieve the elimination of sampling data phase error, The effect of improving the accuracy of angle estimation and improving the degree of restoration

Pending Publication Date: 2022-01-11
ZHEJIANG LAB
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method and system for phase compensation of sampled data based on the Bluetooth fixed extension signal reference period signal to overcome the phase error. The resulting deviation in direction-of-arrival angle estimation

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  • Method and system for eliminating carrier frequency offset of reference period signal based on Bluetooth fixed frequency expansion
  • Method and system for eliminating carrier frequency offset of reference period signal based on Bluetooth fixed frequency expansion
  • Method and system for eliminating carrier frequency offset of reference period signal based on Bluetooth fixed frequency expansion

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Embodiment Construction

[0030] The present invention provides a carrier frequency offset elimination method based on the Bluetooth fixed-frequency extended reference period signal, which establishes a synchronous connection between the Bluetooth receiver with the receiving antenna array and the Bluetooth transmitter, and calculates and receives the fixed-frequency extended reference period in the Bluetooth signal packet The difference between the phase difference between the signal sampling points and the theoretical phase difference adds compensation to the sampling data, eliminating the phase error caused by the carrier frequency offset caused by the out-of-synchronization of the receiver and transmitter crystal oscillators during the synchronization process. The present invention will be described in detail below according to the accompanying drawings and preferred embodiments, and the purpose and effect of the present invention will become clearer. It should be understood that the specific embodime...

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Abstract

The invention discloses a reference period signal carrier frequency offset elimination method and system based on Bluetooth fixed frequency expansion, which are applied to a Bluetooth wireless communication system. The method comprises the following steps: establishing synchronous connection between a Bluetooth receiving end with a receiving antenna array and a Bluetooth transmitting end, and adding compensation to sampling data by calculating a difference value between a phase difference between fixed-frequency extension reference period signal sampling points in a received Bluetooth signal packet and a theoretical phase difference; and eliminating a phase error caused by carrier frequency deviation due to asynchronous crystal oscillators of the receiver and the transmitter in the synchronization process. Under the working mode of single-data-channel multi-antenna time-sharing sampling, the reduction degree of the transmitted signal is improved, so that the estimation precision of the direction of arrival algorithm based on the fixed-frequency extended signal is further improved. The method is low in calculation and hardware complexity and suitable for low-power-consumption Bluetooth 5.1 and above protocols, multiple time-sharing antennas of a receiver share a single data receiving channel, and a received data packet comprises signal phase correction and restoration of a reference period.

Description

technical field [0001] The invention relates to the field of bluetooth technology, in particular to a method and system for eliminating carrier frequency offset errors of a bluetooth fixed-frequency extended reference period signal. Background technique [0002] In the Bluetooth 5.1 standard protocol, in order to support the signal angle of arrival estimation function, the end of each Bluetooth signal packet contains a constant frequency extension signal (CTE). The Bluetooth signal receiving end switches between different antennas in time division, and performs I / Q data sampling and processing on the fixed-frequency extended signal at a certain sampling rate. According to the geometric arrangement information of the antenna array and the phase information of the sampled signal when different antennas are sampled, combined with the angle-of-arrival algorithm such as multiple signal classification, the receiver can calculate the direction of arrival of the signal in space. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00
CPCH04L27/0014H04L2027/0026
Inventor 励翔东卢昊杨李杰邓庆文沈思逸曾玉明许桐恺徐志伟
Owner ZHEJIANG LAB
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