GMSK调制解调系统英文03.doc

GMSK modulation demodulation system Background GMSK, with excellent spectral efficiency and power efficiency characteristics, and thus as a modulation technique is widely used in many current wireless standards (GSM, DECT, CDPD). The form of a review of a relatively coherent demodulation and non-coherent demodulation technique .Reserves the right to non-coherent differential detection programs have fast synchronization, and hardware simplicity advantages at the same time, the use of decision feedback equalization (DFE), a non-redundant error correction (NEC) and other technology to enhance the performance of the conventional differential demodulator and use a combination of several techniques to a variety of new demodulation scheme. This article elaborates on the causes of the decline in the wireless communications. With the decline of sexual Road statistical model to model the wireless channel . The use of computer simulation demodulation scheme in the thermal noise, multipath fading, Doppler shift, and the error rate performance under the co-channel interference and other communications environment. GMSK Introduction Gaussian Minimum Shift Keying (GMSK) which has good spectral efficiency due to radiation and low-band, constant envelope characteristics makes it able to use the high power efficiency of Class C amplifier. These excellent features make it as an efficient digital modulation schemes are widely used in a variety of communication systems and standards. Including: Based on GSM technology developed by the European Telecommunications Standards Institute (ETSI) specification developed by Global Communications (GSM) digital cellular mobile systems; Formulated by the European Post and Telecommunications Association (CEPT), European Telecommunications Standards the ETS1300 a 175 Cordless Telecommunications standard (DECT); The United Kingdom and Hong Kong-based communication standard for cordless phones (Cordless Phones) and telecommunications points (T