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Topic: Gaussian minimum shift keying

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	Bandwidth-Efficient Modulation
		With Gaussian minimum shift keying, input bits with rectangular (+1, -1) representation are converted to Gaussian (bell-shaped) pulses by a Gaussian filter before further smoothing by a frequency modulator.
		With Gaussian minimum shift keying, there are no well-defined phase transitions to detect for bit synchronization, and the energy from each bit is mixed with the energy from several other bits.
		In other words, the Gaussian minimum shift keying waveform is usually less power-efficient than more traditional waveforms such as binary phase-shift keying and requires a more complex receiver, but this potential reduction in power efficiency and increase in receiver complexity could be rewarded with a very significant enhancement of bandwidth efficiency.
	www.aero.org /publications/crosslink/winter2002/03.html (2366 words)

	Modulation
		The three key parameters of a sinusoid are its amplitude, its phase and its frequency, all of which can be modified in accordance with an information signal to obtain the modulated signal.
		MSK and GMSK are particular cases of continuous phase modulation (CPM).
		The use of on-off keying to transmit Morse code at radio frequencies is known as continuous wave (CW) operation.
	www.brainyencyclopedia.com /encyclopedia/m/mo/modulation.html (782 words)

	PacComm Modem Technology
		A key feature of the DFM modem design is digital generation of the transmit audio waveform.
		This modulation method is termed Gaussian Minimum Shift Keying (GMSK) by the IC manufacturer.
		Using a DFM modem entails modification to a voice radio so that direct connection can be made to both the modulation varactor and receiver discriminator.
	www.paccomm.com /modtech.html (398 words)

	Global System for Mobile Communications - Wikipedia, the free encyclopedia
		From the point of view of the consumer, the key advantage of GSM systems has been higher digital voice quality and low cost alternatives to making calls such as text messaging.
		The modulation used in GSM is Gaussian minimum shift keying (GMSK), a kind of continuous-phase frequency shift keying.
		In GMSK, the signal to be modulated onto the carrier is first smoothed with a Gaussian low-pass filter prior to being fed to a frequency modulator, which greatly reduces the interference to neighboring channels (adjacent channel interference).
	en.wikipedia.org /wiki/GSM (2116 words)

	A simple GMSK modulator for microwave and millimeter-wave frequencies.(Gaussian minimum shift keying) - Microwave ...
		A simple hardware architecture for effective realization of Gaussian minimum-shift keying (GMSK) modulation at microwave and millimeter-wave frequencies is presented.
		The modulator is based on achieving continuous linear phase modulation of a carrier signal over the full 360 [degrees] range.
		Performance results for a prototype GMSK modulator implementation at 18 GHz are also presented.
	www.highbeam.com /doc/1G1-54195211.html?refid=holomed_1 (164 words)

	Modulation Article, Modulation Information (Site not responding. Last check: 2007-10-09)
		When OFDM is used in conjunction with channel coding techniques, itis described as ' Coded orthogonal frequency division modulation ' (COFDM).
		Where the signal is a simple low speed on-off indication, as in morse code or radioteletype (RTTY)transmission, modulation is often known as 'keying' as in the terms
		Where Morse code is used to turn the carrier wave on and off, the term usedis not 'amplitude keying', but 'continuous wave' (CW) operation.
	www.anoca.org /pulse/keying/modulation.html (227 words)

	Electrical Engineering Glossary Definition for GMSK - Maxim/Dallas
		Maxim > Glossary of EE Terms > GMSK
		Gaussian minimum shift keying (GMSK) is a form of frequency shift keying (FSK) used in GSM systems.
		The tone frequencies are separated by exactly half the bit rate.
	www.maxim-ic.com /glossary/index.cfm/Ac/V/ID/521/Tm/GAUSSIAN_MINIMUM_SHIFT_KEYING (80 words)

	RF Avenue - Digital Modulation Tutorial, Theory, & Tools -- FSK, PSK, BPSK, QPSK, Books, Book Reviews, ...
		Differential Phase Shift Keying (DPSK) Modulation - DBPSK, DQPSK,...
		Also covers a number of related issues such as intersymbol interference, pulse shaping, signal-to-noise ratio, and bit error rate.
		- Explores the logical path from the elementary BPSK modulation scheme, to QPSK, to OQPSK, to MSK, and finally to GMSK modulation.
	www.newwaveinstruments.com /resources/rf_microwave_resources/sections/digital_modulation_tutorial_theory_technique.htm (1090 words)

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