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2018 Fiscal Year Final Research Report

The implementation architecture design for a high efficient wireless frequency usage technique

Research Project

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Project/Area Number 16K06339
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Communication/Network engineering
Research InstitutionThe University of Electro-Communications

Principal Investigator

Han Chenggao  電気通信大学, 大学院情報理工学研究科, 准教授 (10400714)

Project Period (FY) 2016-04-01 – 2019-03-31
Keywords無線周波数利用効率 / 通信方式 / 畳み込み拡散多重接続方式 / 高速フーリエ変換 / 高速アダマール変換 / 符号分割多重接続方式
Outline of Final Research Achievements

Convolutional spreading code division multiple access (CS-CDMA) system provides an inter-channel interference free transmission with a high frequency usage efficiency. However, if we employ length $L$ spreading sequences, the naive calculation of the CS operation of CS-CDMA requires $3L$/symbol multiplication. Address such drawback, in this research, we designed an implementation architecture based on shift resistor and fast Fourier/Hadamard transforms. Using the proposed architecture, we can reduce the multiplications operations required for CS operation to $\sqrt{L}\log\sqrt{L}$/symbol for fast Fourier transform based structure and to 0 for fast Hadamard transfor based structure, respectively.

Free Research Field

通信方式

Academic Significance and Societal Importance of the Research Achievements

情報通信産業は二十一世紀の基幹産業であるが、無線通信技術の開発においては、無線周波数資源の枯渇という重大な問題を抱えている。これらの問題に対し、畳み込み拡散多重接続(CS-CDMA: convolutional spreading coded division multiple access)通信方式は、高い無線周波数利用効率を実現できることで、注目されているが、実用では拡散演算の複雑度が高いとの問題点がある。本研究では、CS-CDMAの拡散演算を高速に実現できるシフトレジスターと高速フーリエ/アダマール変換に基づいた実装アーキテクチャーを設計し、拡散演算の計算量を大幅に削減した。

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Published: 2020-03-30  

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