A Synchronization Method for Synchronous CDMA Broadband Communication Systems with GEO Satellites

Takuya SAKAMOTO  Daisuke UMEHARA  Yoshiteru MORIHIRO  Makoto KAWAI  

IEICE TRANSACTIONS on Communications   Vol.E87-B   No.8   pp.2111-2118
Publication Date: 2004/08/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Fundamental Technologies for Broadband Satellite Communications)
synchronous CDMA,  GEO satellite,  synchronization method,  Kalman filter,  

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High speed core networks with optical fibers have spread widely, but it is still difficult to access the core networks from many rural areas. Synchronous CDMA systems with GEO satellite links are attractive to solve this problem, since they have wide service areas and are suitable for packet-based networks due to their statistically multiplexing effects. Additionally, the synchronous CDMA systems have more effective frequency utilization and power efficiency than asynchronous ones. In the synchronous CDMA systems, transmitted signals from fixed earth stations are required to achieve synchronization with each other. The broadband systems require extremely precise timing control as their bit rates increase. In this paper, we propose a synchronization method for a synchronous CDMA communication system using a GEO satellite and verify the feasibility of Gigachip rate synchronous CDMA systems.