Symmetrical frame-based carrier synchronization method

A carrier synchronization and symmetric technology, which is used in carrier adjustment, modulation carrier system, synchronous signal speed/phase control, etc. It can solve the problem that the influence of phase offset cannot be canceled, frequency offset estimation and phase offset estimation cannot be decoupled, and decoding is affected. Bit error rate and other issues to achieve the effect of reducing the bit error rate

Active Publication Date: 2016-03-16
XIDIAN UNIV
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Problems solved by technology

The disadvantage of this method is that this method cannot decouple frequency offset estimation and phase offset estimation; at the same time, in data demodulation and decoding, it cannot effectively solve the impact of large residual frequency offset on

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  • Symmetrical frame-based carrier synchronization method
  • Symmetrical frame-based carrier synchronization method
  • Symmetrical frame-based carrier synchronization method

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings.

[0037] Refer to attached figure 1 , to further describe the method of the present invention.

[0038] Step 1, generating pilot blocks and data blocks.

[0039] Divide the pilot P into n small blocks equally, and the length of each pilot block is L P / n, where n represents the number of pilot blocks, n≥2, L P Indicates the length of the pilot P.

[0040] The data length that produces data block is the binary bit sequence Y of N=(n-1) * t, and wherein, N represents the data length of data block, and n represents the number of pilot blocks, and n≥2, t represents before Turbo coding The length of a data block sent by the sender.

[0041] Step 2, set the data frame structure.

[0042] Encode the binary bit sequence Y with Turbo code to obtain n-1 data blocks, place the first pilot block in the pilot P at the head of the data frame, and place the last pilot block at th...

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Abstract

The invention discloses a symmetrical frame-based carrier synchronization method. The method comprises steps: 1, a pilot block and a data block are generated; 2, a data frame structure is set; 3, signals are sent at a sending end; 4, joint frequency phase offset estimation is carried out at a receiving end; 5, frequency phase offset correction signals are demodulated; and 6, Turbo code decoding is carried out. Defects that frequency offset estimation and phase offset estimation cannot be decoupled in the prior art, and influences on error code performance by large residual frequency offset cannot be effectively solved are overcome, and through arranging the symmetrical data frame structure, the problem of coupling the frequency offset estimation and the phase offset estimation in the case of joint frequency phase estimation can be solved, and the influences on the estimation performance by the large frequency offset can be reduced; and defects that the bit error rate for decoding is influenced as influences of phase offset cannot be cancelled in the case of frequency offset estimation are also overcome, and through carrying out Turbo code decoding on signals after demodulation of the symmetrical frames, the outputted code is obtained, and the bit error rate for decoding is reduced.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and further relates to a carrier synchronization method based on a symmetrical frame in the technical field of digital communication. The invention can estimate the frequency and phase deviation of the received wireless communication signal by means of a symmetrical frame structure in the fields of military communication, satellite communication, telemetry communication, etc., realize the recovery of the wireless communication signal, and ensure the reliability of the wireless communication. Background technique [0002] Data-assisted DA in the traditional frequency-phase-offset estimation technology mainly relies on pilot sequences to estimate the frequency-phase offset. These pilot sequences can be added and inserted to different positions of the data frame to form different frame structures. [0003] The patent "very low signal-to-noise ratio cascaded Hadamard code assisted car...

Claims

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Application Information

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IPC IPC(8): H04L7/06H04L27/00H04L1/00
CPCH04L1/0056H04L7/06H04L27/0014H04L2027/0026
Inventor 孙锦华刘洪微余忠洋吴小钧
Owner XIDIAN UNIV
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