Method and device for double-module mobile terminal reducing radio frequency interference

Abstract

The present invention relates to a method for reducing the radio frequency interference in the double module mobile terminal, the GSM outputs an effective control signal when the GSM is working at the frequency period between 1800M to 1900M, otherwise, the control signal is ineffective; if the control signal is effective and the CDMA is working at the frequency of 1900M, the transmission power of the CDMA signal will be weaken; the invention also relates to a device for reducing the radio frequency interference in the double module mobile terminal, which includes a global mobile communication system GSM module and a code division multiple access CDMA module, and the device also includes an analogue switch, and the control end of the analogue switch leads out the control signal a from the front end of the GSM radio frequency or the GSM base band circuit, the access signals b1 and b2 of the CDMA base band circuit are inputted as the two inputs of the analogue switch, and the control signal inputs the strobe alternative access signal to the CDMA radio frequency transmitting circuit.

Description

technical field [0001] The present invention relates to a dual-mode mobile terminal, in particular to a method and a device for simultaneous operation of a GSM and CDMA dual-mode mobile terminal in a high frequency band (DCS and PCS frequency band). Background technique [0002] With the development of dual-mode mobile terminal users' needs, developers are faced with more and more technical challenges. Among them, the mutual interference of GSM / CDMA dual-mode mobile terminals working simultaneously in the DCS frequency band (1710-1880MHz, referred to as the 1800M frequency band) and the PCS frequency band (1850-1990MHz, referred to as the 1900M frequency band) is an obvious problem. For the network of the PCS frequency band of CDMA, the mobile terminals currently on the market have not taken any effective measures for this, but in the laboratory test, when the two frequency bands work at the same time, CDMA has a huge impact on GSM. [0003] For GC dual-mode mobile terminal...

AI Technical Summary

Problems solved by technology

Among them, the mutual interference of GSM / CDMA dual-mode mobile terminals working simultaneously in the DCS frequency band (1710-1880MHz, referred to as the 1800M frequency band) and the PCS frequency band (1850-1990MHz, referred to as the 1900M frequency band) is an obvious problem. For the CDMA PCS frequency band network, the mobile terminals currently on the market have not taken any effective measures for this, but in the laboratory test, when the two frequency bands work at the same time, CDMA has a huge impact on GSM

[0003] For GC dual-mode mobile terminals that support CDMA 1900M frequency band, GSM 1800M frequency band, and GSM1900M frequency band, when CDMA1900M frequency band and GSM1800M frequency band or adjacent frequencies of GSM1900M frequency band work at the same time, CDMA transmission will cause huge interference to GSM reception, resulting in GSM The receiving sensitivity is greatly reduced, which seriously affects the communication quality of GSM

Therefore, in a communication network environment where CDMA and GSM 1800M frequency bands and 1900M frequency bands exist simultaneously, such dual-mode mobile terminals cannot be used normally.

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