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- 저자 : Hiromasa Habuchi (검색결과 14 건)
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Modified Pseudo Orthogonal M-sequence Sets for Synchronous Optical-CDMA
Yusuke Kozawa,Hiromasa Habuchi 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In this paper, to increase normalized throughput of the optical code-divisionmultiple-access (CDMA) system, optical-CDMA systems with multi-pulse pulse position modulation (MPPM) using the modified pseudo orthogonal M-sequence sets is proposed. The throughput performance and bit error rate (BER) are evaluated by theoretical analysis. Consequently, the normalized throughput of the proposed system can achieve 1.35 [bit/chip] when the number of slots per frame is 16. Furthermore, BER of the proposed system is superior to that of the conventional systems.
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Effect of the Interference Canceler on the Nonorthogonal CSK/CDMA ALOHA
Nobuyoshi KOMURO,Hiromasa HABUCHI,Toshinori TSUBOI 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
Nonorthogonal Code Shift Keying Code Division Multiple Access (CSK/CDMA) ALOHA is expected to improve the throughput in advanced wireless network, such as sensor networks and ad-hoc networks. The throughput of the nonorthogonal CSK/CDMA ALOHA is expected to get better by introducing interference cancellation technique. It is not clear how much the throughput improved by introducing interference canceler. This paper presents the throughput performance of the nonorthogonal CSK/CDMA ALOHA with interference canceler by theoretical analysis. Consequently, it is found that the throughput performance of our system is over 1.0. It is also found that the throughput performance shows more than 295 % increase by using the interference canceler when Eb/No is high.
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Hierarchical Information Acquisition Scheme on the Local Broadcasting System
Yusuke Oka,Hiromasa Habuchi,Kouji Ohuchi 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In this paper, it is proposed the information delivery system that the transmission signal embraces together the wide-area information and the local area information. The distant user from the base station receives the wide-area information only and the nearby user receives together the widearea information and the local-area information. The proposed system uses the code shift keying(CSK) for transmitting the local-area information and the amplitude shift keying(ASK) for the wide-area information. In the proposed system, the broadcast information is hierarchized by combining ASK with CSK.
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