6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications

Research Article

Signal Separation and Reconstruction Method for Simultaneously Received Multi-System Signals in a Unified Wireless System

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  • @INPROCEEDINGS{10.4108/icst.crowncom.2011.245899,
        author={Takayuki Yamada and Doohwan Lee and Hiroyuki Shiba and Yo Yamaguchi and Kazuhiro Uehara},
        title={Signal Separation and Reconstruction Method for Simultaneously Received Multi-System Signals in a Unified Wireless System},
        proceedings={6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications},
        publisher={IEEE},
        proceedings_a={CROWNCOM},
        year={2012},
        month={5},
        keywords={flexible wireless system signal separation signal reconstruction short-time fourier transform},
        doi={10.4108/icst.crowncom.2011.245899}
    }
    
  • Takayuki Yamada
    Doohwan Lee
    Hiroyuki Shiba
    Yo Yamaguchi
    Kazuhiro Uehara
    Year: 2012
    Signal Separation and Reconstruction Method for Simultaneously Received Multi-System Signals in a Unified Wireless System
    CROWNCOM
    IEEE
    DOI: 10.4108/icst.crowncom.2011.245899
Takayuki Yamada1,*, Doohwan Lee1, Hiroyuki Shiba1, Yo Yamaguchi1, Kazuhiro Uehara1
  • 1: NTT Network Innovation Laboratories, NTT Corporation
*Contact email: yamada.takayuki@lab.ntt.co.jp

Abstract

These days, a wide variety of wireless systems are used and new wireless systems appear one after another on the market. In this regard, we proposed a unified wireless system that we call “flexible wireless system”. Comprising flexible access points and a flexible signal processing unit, it collectively receives a wideband spectrum that includes multiple signals from various wireless systems. In cases of simultaneous multiple signal reception, however, reception performance degrades due to the interference among multiple signals. To address this problem, we propose a new signal separation and reconstruction method for spectrally overlapped signals. The method analyzes spectral information obtained by the short time Fourier transform to extract amplitude and phase values at each center frequency of overlapped signals. Using these values enables signals from received radio wave data to be separated and reconstructed for simultaneous multi-system reception. Computer simulation results obtained in evaluating the method’s performance confirmed its effectiveness.