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Electronics 2018, 7(1), 7; https://doi.org/10.3390/electronics7010007

Laboratory Experiment of Blind Adaptive Array with Subcarrier Transmission Power Assignment in Spectrum Superposing Scenarios

1
NTT Network Innovation Laboratories, 1-1, Hikarinooka, Yokosuka-shi, Kanagawa 239-0847, Japan
2
NTT Access Network Service Systems Laboratories, 1-1, Hikarinooka, Yokosuka-shi, Kanagawa 239-0847, Japan
This paper is an extended version of our paper published in the IEEE 84th Vehicular Technology Conference (VTC2016-Fall), Montréal, QC, Canada, 18–21 September 2016.
Current address: Graduate School of Engineering, Chiba University, 1–33 Yayoi-cho, Inage-ku, Chiba-shi 263-8522, Japan.
*
Author to whom correspondence should be addressed.
Received: 14 November 2017 / Revised: 8 January 2018 / Accepted: 9 January 2018 / Published: 11 January 2018
(This article belongs to the Special Issue Smart Antennas and MIMO Communications)
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Abstract

This paper experimentally validates the basic feasibility of our proposed blind adaptive array (BAA) with subcarrier transmission power assignment (STPA) scheme using a prototype. The proposed STPA-BAA enables spectrum superposing without any channel state information between two different wireless communication systems: employing STPA-BAA to the secondary system, inter-system interference from/to the primary system can be suppressed. Exploiting the characteristics of constant modulus algorithm (CMA) and power inversion (PI), the secondary transmitter provides two levels of power density for each subcarrier: high and low levels. It enables the secondary receiver to suppress interference with almost the same level of the desired signal. It is also effective in reducing interference to the primary receiver that has no interference suppression function. This paper conducts laboratory experiments of spectrum superposition in two multicarrier systems by wired setup. Though the practical performance of STPA-BAA is limited due to the quantization level or dynamic range of the transceiver, effectiveness of the proposed scheme is confirmed. View Full-Text
Keywords: adaptive array; blind algorithm; subcarrier transmit power assignment; spectrum superposing; field programmable gate array adaptive array; blind algorithm; subcarrier transmit power assignment; spectrum superposing; field programmable gate array
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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So, H.; Maruta, K.; Suzaki, K. Laboratory Experiment of Blind Adaptive Array with Subcarrier Transmission Power Assignment in Spectrum Superposing Scenarios. Electronics 2018, 7, 7.

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