A Group Demodulator Employing Multi-Symbol Chirp Fourier Transform

Kiyoshi KOBAYASHI  Tomoaki KUMAGAI  Shuzo KATO  

IEICE TRANSACTIONS on Communications   Vol.E77-B   No.7   pp.905-910
Publication Date: 1994/07/25
Online ISSN: 
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.