Encapsulation detection circuit and method thereof

Abstract

The invention discloses a package detection circuit and a method thereof. The circuit comprises a delay related function calculation circuit, and a delay related function for receiving and calculating an input signal. The delay related function calculation circuit comprises an average value deduction circuit for deducting the average value of a certain period of time length of the input signal; aself correlation function calculation circuit for receiving the input signal and calculating the self correlation function of the input signal; a self correlation function DC drift canceling circuit for calculating a DC deviation value and subtracting the DC deviation value from the self correlation function of the input signal; and a package detection trigger calculation circuit for calculating a package detection trigger value according to the delay related function calculation circuit and the output value of the self correlation function DC drift canceling circuit. The package detection circuit can calculate the error generated by DC drift for the delay related function and the self correlation function and eliminate the error, and calculate the package detection trigger value so as todetect the entering time of the package accurately.

Description

technical field [0001] The invention relates to a packet detection circuit and method thereof, in particular to a packet detection circuit and method thereof which are not affected by DC offset. Background technique [0002] When a general packet detection circuit performs packet detection, it first calculates the delay correlation function and the autocorrelation function, and then divides the delay correlation function by the autocorrelation function to obtain the packet detection value, and then compares the packet detection value with a preset threshold to obtain Packet entry time to achieve the purpose of packet detection. [0003] However, when the packet detection circuit has a DC offset, the calculation of the delay correlation function and the autocorrelation function will calculate the components of the DC offset together, resulting in a calculation error, which makes the packet detection circuit unable to detect correctly. The method of calculating the delay corr...

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Problems solved by technology

[0021] However, the above-mentioned packet detection circuit 10 needs to use the DC offset canceller 11 to eliminate the DC offset before it can accurately detect the time when the packet enters, and if the DC offset canceller 11 fails, the DC offset cannot be eliminated, then will make the packet detection circuit 10 unable to accurately detect the time when the packet enters

[0022] In addition to the above-mentioned packet detection circuit 10, some packet detection circuits use noise to eliminate the DC offset in advance before starting the packet detection function, but the DC offset sometimes varies with temperature or other circuit effects. Therefore, after the packet detection is started, sometimes there will still be a DC offset that cannot be eliminated in advance, resulting in calculation errors of the delay correlation function and the autocorrelation function, so that the packet detection circuit cannot accurately detect the packet entry time

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