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A Group Demodulator Employing Multi-Symbol Chirp Fourier Transform
Kiyoshi KOBAYASHI Tomoaki KUMAGAI Shuzo KATO
IEICE TRANSACTIONS on Communications
Publication Date: 1994/07/25
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Personal, Indoor and Mobile Radio Communications)
communication terminal and equipment, group demodulator, FDM-TDM conversion, chirp Fourier transform, personal communication,
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This paper proposes a group demodulator that employs multi-symbol chirp Fourier transform to demodulate pulse shaped and time asynchronous signals without degradation; this is not possible with conventional group demodulators based on chirp Fourier transform. Computer simulation results show that the bit error rate degradation of the proposed group demodulator at BER=10-3 is less than 0.3dB even when a root Nyquist (α=0.5) filter is used as the transmission pulse shaping filter and the symbol timing offset between the desired channel and the chirp sweep is half the symbol period.