期刊名称：International Journal of Advanced Research in Computer Engineering & Technology (IJARCET)
印刷版ISSN：2278-1323
出版年度：2013
卷号：2
期号：4
页码：1389-1392
出版社：Shri Pannalal Research Institute of Technolgy
摘要：GMSK is most prominent standards around the world. Global System for Mobile communication (GSM), Digital European Cordless Telephone (DECT), Cellular Digital Packet Data (CDPD), Digital communications system in the 1800 MHz band (DCS1800 in Europe), Person al communications services in the 1900 MHz band (PCS1900) in U.S., all use GMSK as their modulation format. The reason GMSK is used for GSM is its High spectral efficiency, MSK uses phase variation for modulation so better immune to noise. Non linear amplifiers are used to give better response and consumes less power so low battery usage which is an important parameter in cellular technologies. Gaussian Minimum Shift keying modulation scheme is a derivative of MSK. In GMSK, the side lobe levels of the spectrum introduced in MSK are further reduced by passing the modulating NRZ data waveform through a pre modulation Gaussian pulse-shaping filter. ISI degrade the performance of GMSK. In this paper we suggested the methods for reduction in the ISI. GMSK performance is improved by using optimum filters, Viterbi-adaptive equalization and soft decision Viterbi decoding.
关键词：Bit Error Rate (BER); Gaussian filter; ; Gaussian Minimu m Shift Keying (GMSK); Inter Symbol ; Interference (ISI); Minimum Shift Keying (MSK); Signal to ; Noise Ratio (SNR).
