Seamless Symbol Rate Switching Scheme for Multi-Rate FDMA Modem

Fumihiro YAMASHITA  Kiyoshi KOBAYASHI  Kohei OHATA  Masazumi UEBA  

IEICE TRANSACTIONS on Communications   Vol.E89-B    No.2    pp.545-555
Publication Date: 2006/02/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.2.545
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Satellite Communication
symbol rate,  satellite communications,  seamless switching,  modem,  

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A new seamless symbol rate switchable modem for multi-rate FDMA systems is proposed in this paper. In the new modem, a novel clock phase compensation algorithm makes it possible to switch the symbol rate synchronously between the transmitter and the receiver, with no degradation in BER when the symbol rate is changed. In addition, by matching the interpolation filter to the symbol rate, this modem is capable of operating at lower clock speeds, which greatly reduces the consumption power. Computer simulations confirm its fundamental performance. Simulation results show that the proposed power-efficient symbol rate switchable modem can change the symbol rate without degrading BER performance.