A Digitized Group Modulator Using Simple Fractional Sampling for Multi-Carrier TDMA Radio Systems

Yoshifumi SUZUKI

IEICE TRANSACTIONS on Communications   Vol.E79-B    No.5    pp.701-707
Publication Date: 1996/05/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Radio Communication
group modulator,  simple fractional sampling,  multi-carrier TDMA,  base station,  radio communication,  

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This paper proposes a new digitized group modulator for radio base station transmitters of multi-carrier TDMA. This group modulator can flexibly set carrier spacing and features a simple construction as a result of employing the Simple Fractional Sampling technique. A group modulator LSI was designed and built using 0.5-µm BiCMOS technology, and a π/4-shifted QPSK group modulator was constructed using this LSI. Experiments confirm that the modulator simultaneously generates multiple carriers in a wide bandwidth without the need for precise adjustment and there is little difference between each of the carriers in terms of BER performance. Moreover, experiments confirm that the group modulator's burst-output (frequency hopping) performance is excellent.