Sampling frequency error calculation circuit, sampling frequency error calculation method, signal receiving circuit and signal receiving method

Abstract

The invention discloses a sampling frequency error calculation method. A sampling frequency is used for sampling a signal to generate a first sampling data group and a second sampling data group, and each of the first and second sampling data groups comprises header data in a preset data form. The method includes: carrying out relevance operation of the data in the preset data form and each of the first and second sampling data groups to obtain a first relevance operation result and a second relevance operation result; comparing the first relevance operation result and the second relevance operation result to generate a sampling data group deviation value; generating a sampling frequency error according to the sampling data group deviation value and a time difference between the first sampling data group and the second sampling data group.

Description

technical field [0001] The present invention relates to a signal receiving circuit and method, especially to a signal receiving circuit and method for calculating the sampling frequency error of the sampling frequency and adjusting the sampling frequency accordingly, as well as the sampling frequency error calculation circuit and the corresponding calculation of the sampling frequency error method. Background technique [0002] see figure 1 , which is a schematic diagram of a conventional signal transmission process from a transmitting end to a receiving end. The signal x(t) is sent by the transmitting end, and after passing through the channel, the signal y(t) is formed at the receiving end, and the signal h(t) represents the multipath fading channel (multipath fading channel) function, and w(t) represents the additive white Gaussian noise (Additive White Gaussian Noise, AWGN) function. When x(t) is a multicarrier signal, it can be expressed as I k is the kth symbol ...

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Problems solved by technology

However, this is only an ideal situation. Due to the influence of the circuit process, the frequency of the sampling frequency at the transmitting end will not be exactly equal to 1 / T sym,tx , but the receiving end cannot know the exact sampling frequency of the transmitting end, so the sampling frequency of the receiving end cannot be set to be exactly the same as that of the transmitting end. Furthermore, the set frequency may change due to environmental factors during operation. Therefore, the final data signal obtained by the receiver is T sym,rx is the symbol period at the receiving end, T sym,rx ≠T sym,tx , even if there is only a slight error between the two, it will still cause data errors for a long time

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