Patent ID: 7830912
Filing Date: 2010-11-09
Classification: H04B,H04W

Abstract:
1. A communications device simultaneously operating in a dual-band Code Division Multiple Access (CDMA) communications system and a dual-band Global System for Mobile communications (GSM), the dual-band CDMA communications system comprising a Personal Communications Services (PCS) CDMA communications system and a cellular CDMA communications system, the dual-band GSM communications system comprising a GSM communications system of 900 MHz and a GSM communications system of 1800 MHz, the communications device comprising: a radio signal transceiver module for receiving and transmitting radio signals; a CDMA module for processing signals of the dual-band CDMA communications system, the CDMA module comprising: a GSM module for processing signals of the dual-band GSM communications system comprising: a first CDMA filtering unit coupled to the first CDMA transmitting module for filtering out signals of an overlapping frequency band between the PCS CDMA communications system and the GSM communications system of 1800 MHz outputted from the first CDMA transmitting module; a second CDMA filtering unit coupled to the second CDMA receiving module for filtering out signals of an overlapping frequency band between the cellular CDMA communications system and the GSM communications system of 900 MHz received by the second CDMA receiving module; a first GSM filtering unit coupled to the first GSM transmitting module for filtering out signals of an overlapping frequency band between the cellular CDMA communications system and the GSM communications system of 900 MHz; and a second GSM filtering unit coupled to the second GSM receiving module for filtering out signals of an overlapping frequency band between the PCS CDMA communications system and the GSM communications system of 1800 MHz received by the second GSM receiving module.