Interference Suppression Method between Primary Broadcasting and Secondary Systems Using Load Modulation

Takuma ITO; Naoki HONMA; Keisuke TERASAKI; Kentaro NISHIMORI; Yoshitaka TSUNEKAWA

doi:10.1587/transcom.E98.B.861

Interference Suppression Method between Primary Broadcasting and Secondary Systems Using Load Modulation

Takuma ITO, Naoki HONMA, Keisuke TERASAKI, Kentaro NISHIMORI, Yoshitaka TSUNEKAWA

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Summary :

Controlling interference from the secondary system (SS) to the receiver of the primary system (PS) is an important issue when the SS uses the same frequency band as the television broadcast system. The reason includes that the SS is unaware of the interference imposed on the primary receiver (PS-Rx), which does not have a transmitter. In this paper, we propose an interference control method between PS-Rx and SS, where a load modulation scheme is introduced to the PS-Rx. In this method, the signal from the PS transmitting station is scattered by switching its load impedance. The SS observes the scattered channel and calculates the interference suppression weights for transmitting, and controls interference by transmit beamforming. A simulation shows that the Signal-to-Interference Ratio (SIR) with interference control is improved by up to 41.5dB compared to that without interference control at short distances; the results confirm that the proposed method is effective in controlling interference between PS-Rx and SS. Furthermore, we evaluate the Signal-to-Noise Ratio (SNR) and channel capacity at SS.

Publication: IEICE TRANSACTIONS on Communications Vol.E98-B No.5 pp.861-869

Publication Date: 2015/05/01

Publicized

Online ISSN: 1745-1345

DOI: 10.1587/transcom.E98.B.861

Type of Manuscript: PAPER

Category: Antennas and Propagation

Authors

Takuma ITO
  Iwate University
Naoki HONMA
  Iwate University
Keisuke TERASAKI
  Iwate University
Kentaro NISHIMORI
  Niigata University
Yoshitaka TSUNEKAWA
  Iwate University

Keyword

load modulation, frequency sharing, interference control, channel capacity

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Takuma ITO, Naoki HONMA, Keisuke TERASAKI, Kentaro NISHIMORI, Yoshitaka TSUNEKAWA, "Interference Suppression Method between Primary Broadcasting and Secondary Systems Using Load Modulation" in IEICE TRANSACTIONS on Communications, vol. E98-B, no. 5, pp. 861-869, May 2015, doi: 10.1587/transcom.E98.B.861.
Abstract: Controlling interference from the secondary system (SS) to the receiver of the primary system (PS) is an important issue when the SS uses the same frequency band as the television broadcast system. The reason includes that the SS is unaware of the interference imposed on the primary receiver (PS-Rx), which does not have a transmitter. In this paper, we propose an interference control method between PS-Rx and SS, where a load modulation scheme is introduced to the PS-Rx. In this method, the signal from the PS transmitting station is scattered by switching its load impedance. The SS observes the scattered channel and calculates the interference suppression weights for transmitting, and controls interference by transmit beamforming. A simulation shows that the Signal-to-Interference Ratio (SIR) with interference control is improved by up to 41.5dB compared to that without interference control at short distances; the results confirm that the proposed method is effective in controlling interference between PS-Rx and SS. Furthermore, we evaluate the Signal-to-Noise Ratio (SNR) and channel capacity at SS.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/transcom.E98.B.861/_p

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@ARTICLE{e98-b_5_861,
author={Takuma ITO, Naoki HONMA, Keisuke TERASAKI, Kentaro NISHIMORI, Yoshitaka TSUNEKAWA, },
journal={IEICE TRANSACTIONS on Communications},
title={Interference Suppression Method between Primary Broadcasting and Secondary Systems Using Load Modulation},
year={2015},
volume={E98-B},
number={5},
pages={861-869},
abstract={Controlling interference from the secondary system (SS) to the receiver of the primary system (PS) is an important issue when the SS uses the same frequency band as the television broadcast system. The reason includes that the SS is unaware of the interference imposed on the primary receiver (PS-Rx), which does not have a transmitter. In this paper, we propose an interference control method between PS-Rx and SS, where a load modulation scheme is introduced to the PS-Rx. In this method, the signal from the PS transmitting station is scattered by switching its load impedance. The SS observes the scattered channel and calculates the interference suppression weights for transmitting, and controls interference by transmit beamforming. A simulation shows that the Signal-to-Interference Ratio (SIR) with interference control is improved by up to 41.5dB compared to that without interference control at short distances; the results confirm that the proposed method is effective in controlling interference between PS-Rx and SS. Furthermore, we evaluate the Signal-to-Noise Ratio (SNR) and channel capacity at SS.},
keywords={},
doi={10.1587/transcom.E98.B.861},
ISSN={1745-1345},
month={May},}

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TY - JOUR
TI - Interference Suppression Method between Primary Broadcasting and Secondary Systems Using Load Modulation
T2 - IEICE TRANSACTIONS on Communications
SP - 861
EP - 869
AU - Takuma ITO
AU - Naoki HONMA
AU - Keisuke TERASAKI
AU - Kentaro NISHIMORI
AU - Yoshitaka TSUNEKAWA
PY - 2015
DO - 10.1587/transcom.E98.B.861
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E98-B
IS - 5
JA - IEICE TRANSACTIONS on Communications
Y1 - May 2015
AB - Controlling interference from the secondary system (SS) to the receiver of the primary system (PS) is an important issue when the SS uses the same frequency band as the television broadcast system. The reason includes that the SS is unaware of the interference imposed on the primary receiver (PS-Rx), which does not have a transmitter. In this paper, we propose an interference control method between PS-Rx and SS, where a load modulation scheme is introduced to the PS-Rx. In this method, the signal from the PS transmitting station is scattered by switching its load impedance. The SS observes the scattered channel and calculates the interference suppression weights for transmitting, and controls interference by transmit beamforming. A simulation shows that the Signal-to-Interference Ratio (SIR) with interference control is improved by up to 41.5dB compared to that without interference control at short distances; the results confirm that the proposed method is effective in controlling interference between PS-Rx and SS. Furthermore, we evaluate the Signal-to-Noise Ratio (SNR) and channel capacity at SS.
ER -