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A Class of Multiuser Interference Free Modulations Produced by General Orthogonal Modulations
Yasunaga, Takashi,Oka, Ikuo,Ata, Shingo,Fujiwara, Chikato 통신위성우주산업연구회 2004 Joint Conference on Satellite Communications Vol.2004 No.-
Suppression of multiuser interference effects in a frequency-selective fading channel is big issue in mobile communication system. In this paper, a parameter of modulations is discussed to develop new modulations which do not yield multiuser interference in CDMA. The modulations are shown to be in a certain class of general orthogonal modulations. The general orthogonal modulations are based on orthogonal vectors, which are obtained by multidimensional rotations and have parameters of rotation planes and rotation angles. We find the parameters of general orthogonal modulations that preserves orthogonality among users in the frequency-selective channel. The derived parameters express the new modulations, whose transfer matrices are expressed by a Kronecker product of two rotation matrices. We obtain the parameters that maximize constellation distance by computer simulations. Numerical results of distance are demonstrated to compare the performance of widely used CDMA and the new modulations proposed in this paper.
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Performance Improvement of Hybrid Search Engine for Wide and Sparse Rules
Keiko Endo,Yuji Yano,Shingo Ata,Ikuo Oka 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.1
Network equipment uses hardware-based search methods for high-speed classification. In future networks, it is expected search hardware needs to find an entry from a large table which contains complex rules. Today, TCAM (Ternary Content Addressable Memory) is used widely as a search hardware in high-speed routers. However, it is difficult to increase the capacity of TCAM. We have proposed MDSE (Multi-Dimensional Search Engine) architecture that can search the large table with power saving. MDSE can be configured by a combination of the different search components. A component of MDSE needs search binary values in power saving. In this paper, we propose TACT (The Advanced Conceptional TCAM) structure optimized for binary long key search. TACT can be applied to a search block of MDSE. We implement MDSE configured by TACT on FPGA, and evaluate that the power consumption of TACT is 7.63 mA per 4 Kbits. Furthermore, we propose TT-HSE (TCAM + TACT Hybrid Search Engine) as MDSE configured by TCAM and TACT. We show that TT-HSE reduces the power consumption by 57.9% compared with MD-TCAM, using TACT performance and the table data generated by Classbenchv6 dataset.
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