A baseband signal processing method and device

Abstract

The invention provides a baseband signal processing method and device. The transmitting end first generates a variable-rate sampling enable clock, then performs interpolation on the first baseband signal according to the variable-rate sampling rate enable clock, and finally uses a multi-stage cascaded average filter Multi-stage cascaded moving average filtering is performed on the first data sequence obtained by interpolation, and the filtered data sequence is sent to the receiving end device as the final upsampling signal, and the receiving end uses a multi-stage cascaded average filter to filter the second baseband signal Perform multi-level cascaded moving average filtering to generate the same variable-rate sampling enable clock as the sending end, extract data from the second data sequence obtained after filtering according to the variable-rate sampling enable clock, and use the extracted data sequence as the final Downsample the signal. The invention can realize variable-rate sampling according to the variable-rate sampling enabling clock, and can effectively suppress out-of-band radiation of signals during up-sampling and spectral aliasing of signals during down-sampling through multi-stage cascaded moving average filtering.

Description

technical field [0001] The present invention relates to the field of communication technologies, and in particular, to a baseband signal processing method and device. Background technique [0002] In a general communication system, the symbol rate is a fixed rate or several rates, 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 sample rate conversion. [0003] At present, signal resampling is implemented by performing integer multiple interpolation or decimation on the signal sequence. When the same integer multiple is used for interpolation and extraction, the obtained signal sequence is an integer multiple. When interpolation and extraction use different integer multiples , the obtained signal sequence is an integer multiple or a non-integer multiple relationship, and finally the inter...

AI Technical Summary

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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