Signal intermediate frequency transmitting device of multimode mobile communication system

Abstract

A signal intermediate frequency transmitting device of a multimode mobile communication system comprises a parameter automatic configuration module, an interpolation filter module, a digital up-converter module and a D / A converter. The parameter automatic configuration module is used for generating frequency points needed by the digital up-converter module and filter coefficients and the interpolation rate needed by the interpolation filer module according to different communication systems; the interpolation filter module is used for conducting interpolation and filter according to the filter coefficients and the interpolation rate; the digital up-converter module is used for up converting signals output by the interpolation filter module to the frequency points and outputting the signals to the D / A converter; the D / A converter is used for conducting digital-to-analogue conversion on the signals output by the digital up-converter module. The signal intermediate frequency transmitting device is suitable for LTE-CDMA / WCDMA / TD-SCDMA / GSM communication systems. The interpolation filter module comprises a four-level filter. The digital up-converter module comprises a digital frequency mixer. The signal intermediate frequency transmitting device can support the multiple communication systems, the structure of the system is simplified, the size of the device is small, and the device is low in manufacturing cost.

Description

technical field [0001] The invention relates to mobile communication multi-mode technology, in particular to a signal intermediate frequency transmitting device for LTE / CDMA / WCDMA / TD-SCDMA / GSM 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 modes of communication, so as to realize switching and simultaneous communication of different modes 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 ...

AI Technical Summary

Problems solved by technology

[0007] (3) As for the devices used for control and monitoring, these devices are independent, and the launch of multi-mode mobile communication systems cannot be realized on the same platform

[0009] (1) Parallel processing channels are used, and the equipment is expensive, bulky, and expensive; (2) Multi-mode signal processing cannot be realized on the same platform; (3) Multi-mode fusion of 3gpp and 3gpp2 has not been realized; (4) Flexibility Low, different systems are not compatible, and different systems and frequency bandwidths cannot be flexibly configured

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