An iterative timing synchronization method based on low density parity check coding soft decision information

Abstract

The invention relates to an iterative timing synchronized method and a device based on soft decision information (SDM) of low-density parity-check coding (LDPC) and belongs to the technical field of digital communication. The invention is characterized by making use of the soft decision information in the low-density parity-check coding to realize timing synchronization. The content of the invention is as following: firstly, after signals received from the system are processed with high power sampling, interpolation and matching with wave filtering by a data receiving and processing module 1, the low-density parity-check code frame originating serial number is obtained from a low-density parity-check code frame synchronous detection module and synchronous processing is triggered; secondly, the invention uses an iterative timing capturing module 2 to realize iterative timing capture, and then the invention uses an iterative timing tracking module 3 to realize iterative timing tracking; finally, the invention uses an iterative timing control module 4 to judge and switch timing capturing and tracking, and controls the final coding data of a low-density parity-check coding module outputting system . The invention can be applied to the timing synchronization with low signal-to-noise ratio and high-speed digital communication and in particular to be suitable for occasions with low signal-to-noise and the occasion of deep space communication and high-speed magnetic recording system, etc.

Description

technical field [0001] The invention belongs to the technical field of digital communication, and in particular relates to an iterative timing synchronization method and device for decoding soft decision information (SDM) based on low-density parity check (LDPC) under the condition of low signal-to-noise ratio (SNR). Background technique [0002] In the field of digital communication, the receiver cannot realize the optimal timing of receiving symbols due to factors such as system thermal noise, transmission delay, frequency source deviation at the transceiver end, communication receiver crystal oscillator frequency drift, and residual deviation after carrier synchronization. Sampling verdict. This will lead to system communication performance degradation or even failure. Aiming at this problem, the receiver can usually adopt a timing synchronization method to solve it. [0003] At present, the practical timing synchronization methods of communication receivers mainly incl...

AI Technical Summary

Problems solved by technology

Moreover, the device of the present invention can also be implemented in full parallel or partially parallel to overcome the problem that high-speed synchronization cannot be achieved due to hardware speed limitations.

Images