8Kurdthongmee W. Design and Implementation of an FPGh-Based Multiple-Color LED Display Board[ J]. Microprocessors and Micr- osystems ,2005, (29) :327-336.
9AT Commands Interface Guide. Version 1.00[S]. Wavecom company.2001.10.
10AT commands for GPRS Version 1.8[S]. WAVECOM company.2002.5