Baseband signal processing method and device

Abstract

The invention provides a baseband signal processing method and device. The method includes: enabling a sending end to firstly generate a variable-rate sampling enable clock; performing interpolation on the first baseband signal according to the variable rate sampling rate enabling clock; and finally, carrying out multi-stage cascade moving average filtering on the first data sequence obtained by interpolation by using a multi-stage cascade average filter; taking a data sequence obtained after filtering as a final upsampling signal to be sent to receiving end equipment; and enabling the receiving end to perform multi-stage cascade moving average filtering on the second baseband signal by using a multi-stage cascade average filter, generating a variable-rate sampling enable clock which is the same as that of the transmitting end, extracting data from a second data sequence obtained after filtering according to the variable-rate sampling enable clock, and taking the extracted data sequence as a final down-sampling signal. According to the invention, variable-rate sampling can be realized according to the variable-rate sampling enable clock, and out-of-band radiation of a signal during up-sampling and frequency spectrum aliasing of the signal during down-sampling can be effectively inhibited through multi-stage cascade moving average filtering.

Description

technical field [0001] The present invention relates to the field of communication technologies, in particular to a baseband signal processing method and device. Background technique [0002] In a general communication system, the symbol rate is one or several rates that are fixed, which makes the relationship between the sampling rates of all levels in the signal processing process a fixed proportional relationship, and the proportional relationship between the sampling rates can be It is realized by the method of sampling rate conversion. [0003] At present, signal resampling is implemented by integer multiple interpolation or extraction of the signal sequence. When the same integer multiple is used for interpolation and extraction, the obtained signal sequence has an integer multiple relationship. When different integer multiples are used for interpolation and extraction , the obtained signal sequence is an integer multiple or a non-integer multiple, and finally the int...

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Problems solved by technology

[0005] In view of this, the present invention provides a baseband signal processing method and device to solve the problem of resampling with fixed integer multiples in the process of interpolation or extraction in the prior art, and filtering of resampled signals Above, the degree of out-of-band suppression is low, resulting in very serious out-of-band radiation of the signal after upsampling, and the problem of spectrum aliasing cannot be well suppressed during downsampling. The technical solution is as follows:

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