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Method and system for estimating carrier frequency offset

A carrier frequency offset and estimated value technology, applied in the field of carrier frequency offset estimation methods and systems, can solve problems such as increasing circuit cost, reducing communication efficiency, and detecting errors in data information, saving circuit costs, improving execution efficiency, and improving stability. sexual effect

Active Publication Date: 2021-07-27
深圳昂瑞微电子技术有限公司
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  • Application Information

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Problems solved by technology

[0005] In view of this, the present application provides a brand-new method and system for estimating carrier frequency offset to overcome that in the prior art, when the carrier frequency offset is filtered by removing DC, it will not only increase the circuit cost, but also easily cause synchronization errors, data information Detect errors, and problems that reduce communication efficiency

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  • Method and system for estimating carrier frequency offset
  • Method and system for estimating carrier frequency offset
  • Method and system for estimating carrier frequency offset

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Embodiment 1

[0050] Embodiment 1 of the present application provides a carrier frequency offset estimation method, such as image 3 as shown, image 3 It is a flow chart of a carrier frequency offset estimation method provided in Embodiment 1 of the present application, the method including:

[0051] S101: Synchronize the received data packets, and complete the detection and determination of the synchronous sequence;

[0052] The transmitter and the receiver have a fixed or pre-agreed synchronous address sequence, and the data packet transmitted by the transmitter contains the address sequence (after BPSK mapping and FSK modulation), which is equivalent to the ID card ID of the transmitter, and the receiver The host knows this ID in advance, and the receiver will only receive the address sequence and its local address (that is, the local address sequence) transmitted from the upper protocol layer. This process of comparing the received data and the local address sequence is a synchronizatio...

Embodiment 2

[0080] On the basis of Embodiment 1, Embodiment 2 of the present application provides a carrier frequency offset estimation system, such as Figure 4 As shown, the system includes:

[0081] Synchronization unit 201, configured to perform synchronous operation on the received data packets, to complete the detection and determination of the synchronous sequence;

[0082] The first calculation unit 202 is configured to use the sampling points of the synchronization address sequence in the data packet to calculate an initial carrier frequency offset estimation value;

[0083] In this application, the first calculation unit is specifically configured to use the sampling points of the synchronous address sequence in the data packet to perform average calculation to obtain an initial carrier frequency offset estimate;

[0084] The initial carrier frequency offset estimate is calculated using the following formula:

[0085]

[0086] in, Represents the initial carrier frequency ...

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Abstract

The present application provides a method and system for estimating carrier frequency offset. The method includes: synchronizing the received data packet to complete the detection and determination of the synchronization sequence; The carrier frequency offset estimation value; the carrier frequency offset compensation amount is calculated by using the local address sequence; the carrier frequency offset estimation value is obtained by using the initial carrier frequency offset estimation value and the carrier frequency offset compensation amount. This method uses the synchronous address sequence of the data packet to compensate the carrier frequency offset. It only needs to detect the synchronous address of the data packet, and the carrier frequency offset can be accurately estimated without adding additional circuits, which greatly improves the execution efficiency of the circuit and saves the circuit cost. . In addition, this scheme does not depend on whether the detection sequence is uniformly distributed between '0' and '1'. Therefore, the receiver designed using this carrier frequency offset estimation scheme will not reduce communication efficiency, and can greatly improve system stability and The sensitivity of the system under conditions of low signal-to-noise ratio.

Description

technical field [0001] The present application relates to the technical field of wireless communication, and in particular to a carrier frequency offset estimation method and system. Background technique [0002] As a common digital modulation method, FSK (Frequency Shift Keying, Frequency Shift Keying), like other frequency modulation methods (such as FM, LFM), the demodulation of data packets and the detection of information bits depend to a large extent Because the receiver can correctly estimate the modulation frequency offset. [0003] At present, the estimation and recovery of the carrier frequency offset for the FSK modulation and demodulation system is generally estimated and corrected by filtering the DC component in the frequency domain for the entire data packet, such as figure 1 As shown, the FSK signal with carrier frequency offset passes through the DC removal module, and then obtains the FSK signal with carrier frequency offset filtered. This method acts on ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H04L27/26
CPCH04L27/0014H04L27/2657H04L27/2671H04L27/2695H04L2027/0026
Inventor 张书迁钱永学叶晓斌王志华孟浩黄鑫
Owner 深圳昂瑞微电子技术有限公司
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