Blind time sequence error detection method and system suitable for low signal-to-noise ratio, and storage medium

Abstract

The invention discloses a blind time sequence error detection method and system suitable for a low signal-to-noise ratio, and a storage medium. The method comprises the steps: carrying out the frequency domain equalization of each subcarrier of each OFDM symbol, so as to eliminate the impact from a channel phase; judging each subcarrier of each OFDM symbol by adopting a timing error detection module so as to eliminate the influence of an information phase; subjecting each subcarrier of each OFDM symbol to an estimation operation to extract a timing error em. The key point of the invention is that the timing error detection module is mainly used for eliminating the influence of an information phase and extracting a timing error by using a timing error detection technology, so that only oneOFDM symbol needs to be estimated and calculated; the use of pilot frequency is avoided by using a judgment mechanism, so that the communication rate can be improved; a corresponding timing error is extracted by using an Early-late thought, and the timing error is sent to a loop filter. The method is suitable for a power line environment with a very low signal-to-noise ratio.

Description

technical field

[0001] The present invention relates to the technical field of blind timing error detection, and more particularly, to a blind timing error detection method, system and storage medium suitable for low signal-to-noise ratio. Background technique

[0002] Orthogonal Frequency Division Multiplexing (OFDM) is developed from MCM (Multi-Carrier Modulation, multi-carrier modulation). OFDM technology is one of the realization ways of multi-carrier transmission scheme. Its modulation and demodulation are realized based on IFFT and FFT respectively. It is a multi-carrier transmission scheme with the lowest complexity and widest application. The main idea of ​​OFDM is to divide the channel into several orthogonal sub-channels, convert high-speed data signals into parallel low-speed sub-data streams, and modulate them for transmission on each sub-channel. Orthogonal signals can be separated by using correlation techniques at the receiving end, which can reduce mutual in...

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