| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
It has been shown that many spreading codes with negative auto-correlation suitable for asynchronous CDMA communications can be generated by NFSRs. Also, some sets of such spreading codes which are orthogonal to each other can be generated and they are suitable for optical CDMA communications. Furthermore, we proposed concatenated codes obtained by a Barker sequence and an NFSR sequence for positioning systems and investigated their aperiodic auto-correlation properties. Due to the excellent aperiodic auto-correlation property of Barker sequence, the side lobes of the proposed concatenated sequences are small.
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