Preamble sequence detection method and device

A technology of sequence detection and preamble, which is applied in the field of communication, can solve the problems of high detection complexity, low detection efficiency, and large detection power consumption, and achieve the effect of improving detection efficiency and reducing detection complexity

Active Publication Date: 2017-10-03
NANJING QINHENG MICROELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned technical problems, the present invention provides a preamble sequence detection method and device, which solves the technical problems of high detection compl

Method used

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  • Preamble sequence detection method and device
  • Preamble sequence detection method and device

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

[0025] figure 1 It is the flow chart of the preamble sequence detection method.

[0026] Receive the baseband I / Q two-way time-domain sampling point signal at the current n time;

[0027] Calculate the power of the input signal at time n;

[0028] P(n)=r(n) 2 +q(n) 2 -G n

[0029] Calculate the signal phase at time n;

[0030]

[0031] Calculate the instantaneous frequency at time n;

[0032]

[0033] Calculate the autocorrelation value R(n) of the instantaneous frequency vector at time n;

[0034]

[0035] Among them, N is the number of preamble sampling points, which is 8×O SR , O SR Is the oversampling multiple, and L is the estimated number of multipaths;

[0036] Judge whether the autocorrelation at time n exceeds the noise threshold;

[0037] If the noise threshold is not exceeded, clear the autocorrelation peak R pk And the peak count value Pc, it is determined that the preamble sequence is not detected,

[0038] If the autocorrelation at time n exceeds the noise...

Example Embodiment

[0045] Example 2

[0046] image 3 It is a structural block diagram of the preamble sequence detection device.

[0047] In the preamble sequence detection device, the time domain to phase domain conversion module, the phase domain to frequency domain conversion module, the autocorrelation module, and the peak search and confirmation module are electrically connected in sequence. The time domain to phase domain conversion module is used to receive the baseband I / Q two-channel time domain sampling point signal to obtain the phase of the signal sampling point; phase domain to frequency domain conversion module to obtain the instantaneous frequency of the signal at time n; autocorrelation module to obtain the instantaneous signal at time n The autocorrelation value of the frequency vector; the peak search and confirmation module is used to determine whether the autocorrelation value exceeds the noise threshold or the autocorrelation peak, confirm whether the peak is found, and determin...

Example Embodiment

[0049] Example 3

[0050] Figure 5 It is a block diagram of the Bluetooth low energy receiver.

[0051] In the Bluetooth low energy receiver, the preamble sequence detection module, the GFSK (Gaussian Frequency Shift Keying) demodulation device and the BLE (Bluetooth Low Energy) unpacking device are electrically connected in sequence, and the preamble sequence detection device is responsible for Preamble sequence detection and rough time synchronization, including time domain to phase domain conversion module, used to receive baseband I / Q two-way time domain sampling point signals, and obtain the phase of signal sampling points; phase domain to frequency domain conversion The module is used to obtain the instantaneous frequency of the signal at time n; the autocorrelation module is used to obtain the autocorrelation value of the instantaneous frequency vector of the signal at time n; the peak search and confirmation module is used to determine whether the autocorrelation value exc...

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Abstract

The invention discloses a preamble sequence detection method and device. The detection method comprises the steps of calculating a power of a signal input at a time point n according to time domain sample point signals of I/Q paths of a baseband received at the time point n; calculating a signal phase at the time point n; calculating a signal instantaneous frequency at the time point n; calculating an autocorrelation value of a signal instantaneous frequency vector at the time point n; determining whether the autocorrelation value exceeds a noise threshold or an autocorrelation peak value, and collecting statistics about peak count value; determining whether the peak count value is greater than a preset threshold, if the peak count value is greater than the preset threshold, determining that the peak value is found, and confirming that the preamble sequence is detected. Compared with the existing cross-correlation operation detection method, the method solves the problems of high detection complexity and high detection power consumption, and realizes the technical effects of lowering the detection complexity and improving detection efficiency.

Description

technical field [0001] The present invention relates to the communication field, in particular to a preamble sequence detection method and device. Background technique [0002] In many communication systems, taking the BLE (Bluetooth Low Energy) system as an example, data is often transmitted in the form of frames, wherein each frame contains a 1-byte preamble sequence, and by detecting the preamble sequence, which can be used to distinguish individual frames. [0003] In the prior art, a preamble sequence detection method that routinely uses cross-correlation operations leads to technical problems of high detection complexity, large detection power consumption, and low detection efficiency. Contents of the invention [0004] In view of the above-mentioned technical problems, the present invention provides a preamble sequence detection method and device, which solves the technical problems of high detection complexity, high detection power consumption and low detection ef...

Claims

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Application Information

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IPC IPC(8): H04L5/00H04L27/26
CPCH04L5/0048H04L27/261
Inventor 王春华
Owner NANJING QINHENG MICROELECTRONICS CO LTD
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