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A pss block cross-correlation detection method

A detection method and cross-correlation technology, applied in digital transmission systems, synchronization devices, electrical components, etc., can solve the problems of low algorithm complexity, performance impact of autocorrelation detection algorithm, poor performance, etc. Influence of small autocorrelation characteristics, effect of stable performance

Active Publication Date: 2022-04-22
SOUTHEAST UNIV
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Problems solved by technology

The autocorrelation detection algorithm uses the received signal and the delayed version of the received signal to perform correlation calculations. Compared with the cross-correlation algorithm, the algorithm complexity is lower, but the performance is poor at low signal-to-noise ratios.
The received signal in 5G cannot remove the subcarrier interference on both sides of the synchronization signal through a low-pass filter, so the performance of the autocorrelation detection algorithm will be affected

Method used

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  • A pss block cross-correlation detection method
  • A pss block cross-correlation detection method
  • A pss block cross-correlation detection method

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Embodiment Construction

[0056] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention All modifications of the valence form fall within the scope defined by the appended claims of the present application.

[0057] A kind of PSS block cross-correlation detection method, such as figure 1 shown, including the following steps:

[0058] Step 1: Add CP when the local PSS time series is generated, and indirectly increase the sequence length for cross-correlation;

[0059] figure 2 It is a flow chart of local PSS time series generation used in the present invention. In step 1, formula (1) is generated according to the PSS of m-sequence:

[0060]

[0061] Generate three ...

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Abstract

The invention discloses a PSS block cross-correlation detection method, step 1: adding a cyclic prefix CP when generating a local PSS time series, and indirectly increasing the sequence length for cross-correlation; step 2: using non-coherent accumulation to improve detection performance; Step 3: After generating the local PSS time series, the receiver performs frequency offset pre-compensation on these local sequences, thereby realizing coarse frequency offset estimation; Step 4: Estimating and compensating the residual frequency offset; Step 5: Considering low signal-to-noise Under the ratio condition, the frequency offset estimation algorithm is optimized from two aspects: reducing the influence of the coarse frequency offset estimation error and optimizing the anti-noise of the residual frequency offset estimation. The present invention can improve detection performance and anti-frequency offset performance in a low signal-to-noise ratio environment, and meet the requirement of 5G downlink synchronization.

Description

technical field [0001] The invention relates to a new PSS block cross-correlation detection algorithm, which belongs to the technical field of signal and information processing. Background technique [0002] Cell search is the first step for the UE to establish communication with the base station. In SA networking, the UE first tries to access the cell it was camping on last time. If there is no last resident information, on the 5G working frequency band, UE uses GSCN (Global Synchronization Channel Number) to search for SS / PBCH block (synchronization signal and PBCH block) according to the supported subcarrier interval, and then completes the detection of PSS (Primary Synchronization Signal), SSS (Secondary Synchronization Signal), and decode PBCH (Physical Broadcast Channel) to obtain MIB (Primary System Information Block). [0003] The detection of the PSS sequence is the first step in parsing the entire SS / PBCH block. The identification within the cell group is obtained...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04W56/00
CPCH04L27/2659H04W56/0035
Inventor 王霄峻郑瑞门
Owner SOUTHEAST UNIV
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