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Ingeniería e Investigación

versão impressa ISSN 0120-5609

Resumo

TORRES NOVA, Juan Mario  e  PAZ PENAGOS, Hernán. Studying and comparing spectrum efficiency and error probability in GMSK and DBPSK modulation schemes. Ing. Investig. [online]. 2008, vol.28, n.3, pp.75-80. ISSN 0120-5609.

Gaussian minimum shift keying (GMSK) and differential binary phase shift keying (DBPSK) are two digital modulation schemes which are -frequently used in radio communication systems; however, there is interdependence in the use of its benefits (spectral efficiency, low bit error rate, low inter symbol interference, etc). Optimising one parameter creates problems for another; for example, the GMSK scheme succeeds in reducing bandwidth when introducing a Gaussian filter into an MSK (minimum shift keying) modulator in exchange for increasing inter-symbol interference in the system. The DBPSK scheme leads to lower error probability, occupying more bandwidth; it likewise facilitates synchronous data transmission due to the receiver’s bit delay when recovering a signal.

Palavras-chave : spectrum efficiency; DBPSK modulation; GMSK modulation; error probability.

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