Symmetrical frame-based carrier synchronization method

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...

AI Technical Summary

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 bit error performance

However, the disadvantage of this method is that due to the use of an asymmetric frame structure, the influence of the phase offset cannot be offset when the frequency offset is estimated, thus affecting the bit error rate of decoding.

Images