Implementation of an Industrial R/C System Using a Hybrid DS/FH Spread Spectrum Technique

Atsushi HOSHIKUKI  Michio YAMAMOTO  Satoru ISHII  Ryuji KOHNO  Hideki IMAI  

IEICE TRANSACTIONS on Communications   Vol.E76-B   No.8   pp.984-989
Publication Date: 1993/08/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Spread Spectrum Techniques and Applications)
industrial R/C system,  hybrid DS/FH,  DS,  FH,  spread spectrum,  

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Industrial radio control systems require a high degree of safety and reliability even in operating environments where harsh interference conditions exist. In order to implement Spread Spectrum (SS) modulation techniques in industrial radio control systems, a hybrid Direct Sequence/Frequency Hopping (DS/FH) system with high speed synchronization capability was designed, implemented and evaluated. In this system, a digital matched filter was utilized for despreading the DS signal. By manipulating the despread signal and sensing the correlation peak, the frequency hopping circuit can operate without a special synchronizing circuit. The focus of this report is on an engineering sample created for the 900MHz band available as an ISM band in the U.S. In this sample, error correction code was integrated with the hybrid DS/FH which gives the system excellent narrow-band interference rejection properties and Code Division Multiple Access (CDMA) capabilities.