公开(公告)号：US11665032B2

公开(公告)日：2023-05-30

申请号：US17619353

申请日：2019-09-25

Applicant: Korea Advanced Institute of Science and Technology

Inventor： Sang-Gug Lee ,  Eui-Rim Jeong ,  Jinho Ko ,  Keun-Mok Kim

IPC: H04L27/00 ,  H04L27/10

CPC classification number: H04L27/0006 ,  H04L27/10

Abstract: A method and apparatus for modulating/demodulating an FSK signal capable of overcoming a trade-off relationship between a modulation index and a spectral efficiency are disclosed. An apparatus for modulating/demodulating a frequency deviation keying (FSK) signal includes a channel selection-modulator, a phase locked loop, and an output unit. The channel selection-modulator modulates an FSK signal by setting a frequency channel to be used. The phase locked loop generates a desired output frequency ‘fout’ compared to a reference frequency ‘fREF’ by adjusting a frequency division ratio (N+n) with respect to a frequency of the modulated FSK signal. The output unit amplifies the FSK signal having the generated output frequency ‘fout’ and radiating the amplified FSK signal through an antenna. Here, each of the frequency channels is divided into two or more tones, and different frequency channels are allocated between the tones divided into two or more tones.