Multi-carrier symbol synchronization method for MF-TDMA (Multi-Frequency Time Division Multiple Access)

Abstract

The invention discloses a multi-carrier symbol synchronization method for MF-TDMA (Multi-Frequency Time Division Multiple Access). The multi-carrier symbol synchronization method comprises the following steps: step 1, carrying out quadratic sum and serial-parallel conversion on M paths of carriers and outputting the M paths of carriers into N paths of parallel data; step 2, performing multi-phasefiltering processing on the N paths of parallel data; step 3, after multi-phase filtering processing, accumulating for L times and caching to a memory; step 4, reading an accumulation result in the memory to carry out arc tangent transformation; step 5, multiplying the output of the arc tangent transformation by the step 6, and multiplying the output of the step 5 by a sampling multiple N; 7, calculating an interpolation base point mk and an interpolation decimal uk according to the output of the step 6; and step 8, performing interpolation filtering on the mk, the uk and the output after themulti-phase filtering processing. In the whole implementation process, the pipeline operation is completed according to the clock rhythm, that is, the processing time difference between the carriers is only 1/(4T), and T is the symbol period, so that Ram resources are saved, and the minimum processing delay of each carrier is ensured.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to an MF-TDMA-oriented multi-carrier symbol synchronization method. Background technique [0002] In satellite communication system, symbol synchronization technology is one of the key technologies to ensure reliable communication between satellite and terminal. The symbol synchronization algorithm is divided into a feedback structure and a feedforward structure according to whether a closed loop is formed. The symbol synchronization algorithm with feedback structure has a long convergence time and may appear "hanging" phenomenon, which makes it unable to be directly applied to burst communication systems with less data volume, such as figure 1 As shown, the feedback structure based on Gardner algorithm. The feed-forward structure based on the square law timing error device can directly obtain accurate timing deviation estimation through simple calculation, so as t...

AI Technical Summary

Problems solved by technology

The current time-division multiplexing method is to store the multi-carrier low-speed data to be synchronized, divide the time into several time slots, and process the symbol synchronization of one carrier in each time slot one by one. Such processing requires a large amount of raw data. Caching, and at the same time lead to a large delay in the processing of the last carrier, which affects the effect of real-time communication such as voice

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