Signal intermediate-frequency receiving device suitable for multimode mobile communication system

Abstract

A signal intermediate-frequency receiving device suitable for a multimode mobile communication system comprises an AD sampling module, a decimation filter module, a digital down-conversion module, a PLL module and an automatic parameter configuration module. The AD sampling module is used for carrying out DA conversion on an input signal to obtain a 54.24 MHz intermediate-frequency signal. The PLL module is used for providing a clock for the whole intermediate-frequency receiving device. The automatic parameter configuration module is used for generating the frequency control word of the digital down-conversion module and the filter coefficient and decimation ratio needed by the decimation filter module according to diffident communication standards. The digital down-conversion module is used for carrying out down-conversion on a signal output by the AD sampling module to achieve baseband zero frequency of the signal. The decimation filter module is used for carrying out decimation and filtering according to the filter coefficient and the decimation ratio, and comprises a four-stage filter. The digital down-conversion module comprises a digital mixer. The signal intermediate-frequency receiving device can meet various communication standards like LTE/CDMA/WCDMA/TD-SCDMA, and is simpler in system structure, small in equipment size and low in manufacturing cost.

Description

technical field [0001] The invention relates to mobile communication multi-mode technology, in particular to a signal intermediate frequency receiving device supporting a multi-mode mobile communication system. Background technique [0002] With the continuous development of mobile communications, 3G and LTE, multi-mode terminals will become the development trend of mobile terminals. A variety of mobile communication systems need to support multiple frequency bands and multiple standards of communication, so as to realize switching and simultaneous communication of different systems on the same hardware platform. With the issuance of LTE licenses, the same communication requirements for supporting different mobile communication systems have become more and more urgent. The wireless side of the mobile communication system includes three parts: radio frequency, intermediate frequency, and baseband. The radio frequency can use the same radio frequency hardware to realize multi...

AI Technical Summary

Problems solved by technology

[0007] (3) For control and monitoring devices, these devices are independent and do not support multi-mode mobile communication systems on the same platform

[0009] (1) Parallel processing channels are adopted, and the equipment cost is large, the volume is large, and the cost is high;

[0010] (2) Multi-mode signal processing cannot be realized on the same platform;

[0011] (3) The multi-mode fusion of 3gpp and 3gpp2 has not been realized;

[0012] (4) Low flexibility, different systems are not compatible, and different systems and frequency bandwidths cannot be realized

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