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Open Access
Highly Efficient Sensing Methods of Primary Radio Transmission Systems toward Dynamic Spectrum Sharing-Based 5G Systems

Atomu SAKAI, Keiichi MIZUTANI, Takeshi MATSUMURA, Hiroshi HARADA

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Summary :

The Dynamic Spectrum Sharing (DSS) system, which uses the frequency band allocated to incumbent systems (i.e., primary users) has attracted attention to expand the available bandwidth of the fifth-generation mobile communication (5G) systems in the sub-6GHz band. In Japan, a DSS system in the 2.3GHz band, in which the ARIB STD-B57-based Field Pickup Unit (FPU) is assigned as an incumbent system, has been studied for the secondary use of 5G systems. In this case, the incumbent FPU is a mobile system, and thus, the DSS system needs to use not only a spectrum sharing database but also radio sensors to detect primary signals with high accuracy, protect the primary system from interference, and achieve more secure spectrum sharing. This paper proposes highly efficient sensing methods for detecting the ARIB STD-B57-based FPU signals in the 2.3GHz band. The proposed methods can be applied to two types of the FPU signal; those that apply the Continuous Pilot (CP) mode pilot and the Scattered Pilot (SP) mode pilot. Moreover, we apply a sample addition method and a symbol addition method for improving the detection performance. Even in the 3GPP EVA channel environment, the proposed method can, with a probability of more than 99%, detect the FPU signal with an SNR of -10dB. In addition, we propose a quantized reference signal for reducing the implementation complexity of the complex cross-correlation circuit. The proposed reference signal can reduce the number of quantization bits of the reference signal to 2 bits for in-phase and 3 bits for orthogonal components.

Publication
IEICE TRANSACTIONS on Communications Vol.E104-B No.10 pp.1227-1236
Publication Date
2021/10/01
Publicized
2021/03/30
Online ISSN
1745-1345
DOI
10.1587/transcom.2020DSP0008
Type of Manuscript
Special Section PAPER (Special Section on Dynamic Spectrum Sharing for Future Wireless Systems)
Category

Authors

Atomu SAKAI
  Kyoto University
Keiichi MIZUTANI
  Kyoto University
Takeshi MATSUMURA
  Kyoto University
Hiroshi HARADA
  Kyoto University

Keyword