Development of an Interference Canceller in Satellite Communications Using a Multi-Level Modulation with Superposed Transmission

Shoko KURODA  Sho TANAKA  Shigeo NAOI  Yozo TAKEDA  Ryusuke MIYAMOTO  Takao HARA  Minoru OKADA  

IEICE TRANSACTIONS on Communications   Vol.E92-B   No.11   pp.3354-3364
Publication Date: 2009/11/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.3354
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Satellite Communication Technologies in Conjunction with Main Topics of JC-SAT2008)
satallite communication,  carrier superposed transmission,  delay mesurement,  interference canceller,  

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This paper proposes an architecture of an interference canceller for satellite communications with super-posed transmission, which is applicable not only to QPSK but also to 16QAM transmission to get higher satellite capacity. We implement it as an FPGA-based prototype and verify its performance. We propose here to use a new method to measure the satellite round-trip delay using an extended matched filter (EMF), which can work in low C/N conditions such as 0 dB and under. Given this performance, our canceller can work in a network in which forward and reverse links have the same power level. The results of the laboratory tests for QPSK show that interference can be suppressed by about 30 dB and that the BER degradation due to the canceller was small enough for operation.