Pseudo-random noise code tracing circuit and method

Abstract

The invention provides a pseudo-random noise code tracing circuit, which comprises a first correlator, a storage device, a second correlator and a determiner. The first correlator is used for performing related operation on first pseudo-random noise codes of a first signal frame and the local pseudo-random noise codes to output the first group of correlated values, and performing related operation on second pseudo-random noise codes of a second signal frame and the local pseudo-random noise codes to output the second group of correlated values; the storage device is coupled with the first correlator for storing the first group of correlated values and the second group of correlated values; the second correlator is coupled with the storage device for performing related operation on the first group of correlated values and the second group of correlated values to output a displacement value; and the determiner is coupled with the second correlator for generating a frame number accordingto the displacement value.

Description

technical field [0001] The present invention relates to a tracking circuit and a related method thereof, in particular to a pseudo-noise code tracking circuit and a pseudo-noise code tracking method. Background technique [0002] In a time domain synchronous orthogonal frequency-division multiplexing (TDS OFDM) system, the receiver needs to determine the pseudonoise code (pseudonoise) of the received signal by performing code acquisition. code, PN code), in order to achieve the purpose of synchronization with the transmitter. In the prior art, the receiving end performs a correlation operation (correlation) between the pseudo noise codes of the two signal frames (frames) in the received signal and a pseudo noise code generated by the receiving end to generate two sets of correlation values, and then The pseudo noise code of the received signal is judged according to the positions of the peaks in the two sets of correlation values. [0003] However, when the noise generated...

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Problems solved by technology

[0003] However, when the noise generated by the channel does not belong to additive white Gaussian noise (additive white Gaussian noise), the reliability of the pseudo-noise code judged only based on the peak position is not high, for example, in single frequency network (single frequency network) In the frequency network (SFN), the signal frames corresponding to the peaks in the two sets of correlation values ​​before and after may come from different paths (path), which leads to misjudgment of the pseudo-noise code by the receiving end, and to improve the accuracy of judging the pseudo-noise code If the degree is high, the correlation operation must be performed at a higher sampling frequency, but it will cause a burden on the operation circuit due to a large increase in the amount of calculation.

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