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

A low signal-to-noise ratio, error detection technology, applied in transmission systems, multi-frequency code systems, digital transmission systems, etc., can solve the problems of not being able to converge well to the expected value, large errors, and reduced speed

Active Publication Date: 2020-10-23
SHENZHEN FRIENDCOM TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method will inevitably reduce the rate due to the insertion of pilots. Secondly, because it uses two OFDM symbols before and after the differential operation, if it is in a low signal-to-noise ratio environment, it will inevitably introduce large noise, so the estimation error will be very large. This method is generally only suitable for environments with relatively good channel conditions.
In the power line environment, due to the large noise, the performance of the timing error is greatly deteriorated, so that the entire loop cannot converge to the expected value well.

Method used

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

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Experimental program
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Embodiment 1

[0043]In general communication modules and devices, in the baseband of the receiving end, due to the ADC sampling clock offset (SFO), there is generally a Timing Error Detector (TED) (TED module for short) in its baseband.

[0044] like figure 1 As shown in the figure, the general flow chart of the estimation and compensation of sampling offset (SFO) in the OFMD communication system is described in the figure; the INTERP module refers to the time domain interpolation module, which adjusts the sampling deviation of the input signal according to the current NCO value to compensate the estimation The calculated timing error; the FFT module refers to converting the OFDM signal in the time domain to the frequency domain to obtain the received data y of each subcarrier m (k); The FEQ module refers to performing frequency domain equalization on each subcarrier of the current OFDM symbol to obtain x m (k), thereby eliminating the influence of the channel phase; the TED module refers ...

Embodiment 2

[0068] The present invention also provides an embodiment of a blind timing error detection system suitable for low signal-to-noise ratio, comprising one or more processors and a memory; wherein the memory is used to store one or more computer programs, the one or more The plurality of processors are configured to execute one or more computer programs stored in the memory, so that the processors execute the steps of the embodiment of the method for blind timing error detection suitable for low signal-to-noise ratio described in the first embodiment.

Embodiment 3

[0070] The present invention also provides a computer-readable storage medium. Those skilled in the art can understand that all or part of the steps of implementing the above method embodiments can be completed by hardware related to computer programs. The aforementioned computer program can be stored in a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed (for example, by a processor), the first embodiment is suitable for low signal-to-noise ratio. The steps of the blind timing error detection method, and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other media that can store program codes.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00H04L27/26H04B3/54
CPCH04L7/0062H04L27/2676H04B3/54Y02D30/70
Inventor 崔涛董银锋李登峰
Owner SHENZHEN FRIENDCOM TECH DEV
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