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GFSKGaussian Frequency Shift Keying
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Furthermore, the Bluetooth radio chip uses Gaussian frequency shift keying (GFSK) modulation (with a modulation index between 0.28 and 0.35 in order to balance the effect of in-band interference between bit 0 and bit 1) and a 0.5 [WT.sub.B] factor on the Gaussian filter, where [WT.sub.B] is the time-bandwidth product of the filter-response.