The Hardware Platform Design Of The GSM Femtocell

With the evolution of the whole telecommunications network,all countries are vigorouslyresearching a variety of the access network technology and access network equipments.Theimprovement of telecommunications business,the improvement of consumption habits and theneeds of solving communication blind spots and hot spots,which make the research of indoorbroadband wireless access system equipment important.This paper study the networkarchitecture of the indoor broadband wireless access system,design the hardware platform ofGSM indoor broadband wireless access system.GSM indoor broadband wireless access system has a variety of types.The femtocelldesigned in paper is aimed at families and companies,which integrates several networkelements of traditional MacroCell structure and uses the popular flat network structure.Theaccess to the core network is in different ways according to the different integration of networkelements.The base station in paper integrates BTS and BSC which accesses to the corenetwork through IP network.The hardware platform includes the OAM system,the upper layerprotocol subsystem,MAC layer and the physical layer,the radio transceiver system,WLANsystem and power clock system.This paper studies the data processing of the MAC layer andthe physical layer and the medium frequency and the sampling clock selection,which focus onthe hardware circuit design of the two parts.The design deals with the data of physical layerand MAC layer through the DSP and the FPGA platform respectively, compared to onlyprocessing in FPGA. It is favor of the function expansion and cost saving. In addition, thesystem also integrates a WLAN function.IF test results show that ADC spurious free dynamic range is greater than68.5dBc andDAC adjacent channel leakage ratio is greater than30dBc;system tests show that the indicatorsof the design of the hardware platform meet the system requirements.