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The RF Signal Analysis of GSM Mobile Telephone and the Hardware Design on the Basis of Digital Low IF Technology

Author: ZhuJiang
Tutor: LiFuHai
School: Hunan University
Course: Circuits and Systems
Keywords: Radiofrequency Antenna switch Power amplifier EMC
CLC: TN929.532
Type: Master's thesis
Year: 2005
Downloads: 457
Quote: 2
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Abstract


At present, in China 's mobile communication market personal terminal mainstream products for GSM mobile phone . But with the sharp increase of the number of mobile users , the problems exposed by the GSM mobile phone RF system is also becoming more serious . Such as : received signal sensitivity is decreased, the transmission power value of deviation from the normal operating range , the error rate, the phase error is large , the occupied area of the RF circuit is too large . The article first in-depth study on the GSM mobile phone RF signal processing and RF circuit theory . On this basis , the paper from the principles and application of three different GSM mobile phone RF system solutions and comparative analysis . Mainly Analog Devices superheterodyne double-conversion systems , low level of integration occupied board area , at the same time in the mirror frequency interference generated frequency conversion process ; recent zero-IF RF systems , RF the circuit relative superheterodyne two sub - inverter type of integration is greatly improved , but the system is the introduction of the DC component , low-frequency interference and non-linear interference ; in order to solve the above technical bottlenecks , the use of the concept of digital low-IF RF system design . Text , digital low-IF technology as the core hardware circuit design has the following characteristics . The module design of the core circuit , the use of the chip has been achieved a digital low- IF technique ; in the power amplification circuit module , the design method enables the degree of integration of the system to be improved , and also to increase work efficiency of the amplifier circuit module ; by analysis based on the design of the high frequency characteristics of the basic components of the antenna switch circuit , so that reduces the high-frequency interference from baseband ; antenna matching circuit design , software simulation , select the theoretically optimal matching , and shorten the development cycle ; EMC design , combined with power management, baseband and RF three aspects of systems analysis , and system testing . Finally, the paper describes the part of the inadequacies of the RF signal analysis and digital low-IF technology - based hardware design to be improved .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Mobile Communications > Cellular mobile communications systems (mobile phones, mobile phone handsets ) > Time Division Multiple Access (TDMA) mobile communications
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