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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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  • 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 complexity, high detection power consumption and low detection efficiency in the prior art, and realizes the reduction of detection complexity. and the technical effect of improving detection efficiency

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  • Preamble sequence detection method and device

Examples

Experimental program
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Effect test

Embodiment 1

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

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

[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] Wherein, N is the number of preamble sample point, is 8×O SR , O SR is the oversampling multiple, and L is the estimated number of multipaths;

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

[0037] If the noise threshold is not exceeded, clear the autocorrelation peak R pk With the peak count value Pc, it is determined that no preamble sequence has been detected,

[0038] If the autocorrelation exceeds the...

Embodiment 2

[0046] image 3 It is a structural block diagram of a 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, wherein the time domain to phase domain conversion module is used to receive the baseband The I / Q two-way time-domain sampling point signal of the signal is used to obtain the phase of the signal sampling point; the phase domain to frequency domain conversion module is used to obtain the instantaneous frequency of the signal at time n; the autocorrelation module is used to obtain the instantaneous signal frequency 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 v...

Embodiment 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 consumption) unpacking device are electrically connected in sequence, wherein the preamble sequence detection device is used to be responsible for Preamble sequence detection and village rough time synchronization, including time domain to phase domain conversion module, used to receive the baseband I / Q two-way time domain sampling point signal, to obtain the phase of the signal sampling point; phase domain to frequency domain conversion module, for obtaining the instantaneous frequency of the signal at n moments; the autocorrelation module, for obtaining the autocorrelation value of the signal instantaneous frequency vector at n moments; the peak search and confirmation module, for judging whether the autocorrelation va...

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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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