Research On Signal Processing And Radio Resource Management For OpenBTS

OpenBTS is a software GSM transceiver, It is based on GNU Radio and USRP (Universal Software Radio Periphera).The Special ways of OpenBTS is that uses USRP and GNU Radio to achieve three-layer protocol of GSM air interface (Um), and uses the Asterisk PBX to connect the call. Thus the mobile phone of GSM can make calls through OpenBTS.OpenBTS package is built on top of GNURadio which is a well-known and free software development kit software radio functions. The hardware platforms of OpenBTS include the USRP and general PC. The purpose of OpenBTS is to introduce telecommunications services which are applicable for low-cost and low population density. It was originally proposed by Harving Samra David A.Burgess. Today the evolution direction of OpenBTS is formulated by3GPP.This article describes the operational processes of OpenBTS, which embraces the network settings, registration number, Synchronization of USRP and PC, two network notification text messages and phone connected to the state monitoring. Otherwise we discuss a successful business OpenBTS example:the low-cost phone service projects in Brazil Amazon region. The main contents include the flow of phone calls, the wireless resource management, and power control.In the BER simulation part, Viterbi equalizer and DFE equalizer which uses in OpenBTS are two commonly non-linear equalization techniques in the GSM physical layer. We compare two BER, and simulate the GSM BER which using Viterbi equalizer. The simulation work has a guiding significance to OpenBTS.The future development that I think about OpenBTS will be functionality extended, such as multi-band, support the positioning technology, and higher data throughput, greater capacity to support IP.