Fast convergence decision-guided carrier recovery method and system based on caching

Abstract

The invention relates to a method and system for recovering a rapid convergence decision-directed carrier based on cache. The method for recovering the rapid convergence decision-directed carrier comprises the steps of: (a) acquiring a first data symbol and a first frame header symbol; (b) acquiring a second data symbol according to the first data symbol and the first frame header symbol; (c) caching and counting the second data symbol in sequence to acquire a first input symbol or a second input symbol; (d) performing the phase compensation to the first input symbol or the second input symbolaccording to a first compensating signal to acquire a first output symbol; (e) calculating to acquire a second compensating signal according to the first output symbol; and (f), assigning the secondcompensating signal to the first compensating signal, repeating the step (d) to (e), and performing the phase compensation to the subsequent first input symbol or second input symbol. By adoption of the method and the system, the carrier is recovered in a minimal number of valid symbols and even in the first valid symbol.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a cache-based fast convergence decision-guided carrier recovery method and system. Background technique [0002] Using known data, carrier recovery can be divided into data-assisted carrier recovery algorithms and blind carrier recovery algorithms. Although the data-assisted carrier recovery algorithm is faster and more accurate in estimating the frequency phase offset, the auxiliary sequence reduces the utilization rate of effective data, and the blind carrier recovery algorithm can allocate all spectrum resources to effective data signals, so it is popular at home and abroad. scholars' attention. [0003] In 1980, Godard of IBM proposed a DD (Decision Directed) algorithm. The DD algorithm is a decision-guided carrier estimation algorithm, which estimates the phase error by making constellation point judgments on the received symbols. When the signal-to-noise...

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Problems solved by technology

In 2010, Wei et al. of Zhejiang University proposed a multi-threshold polarity judgment algorithm. By analyzing the constellation diagram of a specific modulation order, a radius range of only four constellation points per circle is selected, and the phase discrimination range is not lost. At the same time, the number of available symbol points is increased, and the frequency offset acquisition speed is improved, but for different modulation order constellation diagrams, the size and number of power thresholds need to be reset

[0004] However, for burst communication systems, none of the above algorithms can converge, capture and track the frequency offset within a very small number of symbols, so certain effective information will be lost

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