An Interference Cancellation Scheme for Mobile Communication Radio Repeaters

Moohong LEE; Byungjik KEUM; Young Serk SHIM; Hwang Soo LEE

doi:10.1587/transcom.E92.B.1778

An Interference Cancellation Scheme for Mobile Communication Radio Repeaters

Moohong LEE, Byungjik KEUM, Young Serk SHIM, Hwang Soo LEE

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An interference cancellation (ICAN) scheme for mobile communication radio repeaters is presented. When a radio repeater has a gain that is larger than the isolation between its transmit and receive antennas, it oscillates due to feedback interference signals. To prevent feedback oscillation of a radio repeater, we first formulate a feedback oscillation model of the radio repeater and then derive an ICAN model from that model. From the derived ICAN model, we show that the stability and the signal quality of the repeater depend on the repeater's gain and delay, the propagation delay on feedback paths, feedback channel characteristics, and the capability of the feedback channel estimation algorithm. It is also shown that the stability condition of the repeater does not guarantee the quality of the repeater's output signal. To guarantee repeater's stability and signal quality, an ICAN scheme based on an iterative algorithm is subsequently proposed. The simulation results confirm the relationship between the stability and signal quality of the repeater and the impact of the aforementioned factors. Using the proposed ICAN scheme, a mean error vector magnitude (quality indicator) of about 6.3% for the repeater's output signal was achieved.

Publication: IEICE TRANSACTIONS on Communications Vol.E92-B No.5 pp.1778-1785

Publication Date: 2009/05/01

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Online ISSN: 1745-1345

DOI: 10.1587/transcom.E92.B.1778

Type of Manuscript: Special Section PAPER (Special Section on Radio Access Techniques for 3G Evolution)

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Moohong LEE, Byungjik KEUM, Young Serk SHIM, Hwang Soo LEE, "An Interference Cancellation Scheme for Mobile Communication Radio Repeaters" in IEICE TRANSACTIONS on Communications, vol. E92-B, no. 5, pp. 1778-1785, May 2009, doi: 10.1587/transcom.E92.B.1778.
Abstract: An interference cancellation (ICAN) scheme for mobile communication radio repeaters is presented. When a radio repeater has a gain that is larger than the isolation between its transmit and receive antennas, it oscillates due to feedback interference signals. To prevent feedback oscillation of a radio repeater, we first formulate a feedback oscillation model of the radio repeater and then derive an ICAN model from that model. From the derived ICAN model, we show that the stability and the signal quality of the repeater depend on the repeater's gain and delay, the propagation delay on feedback paths, feedback channel characteristics, and the capability of the feedback channel estimation algorithm. It is also shown that the stability condition of the repeater does not guarantee the quality of the repeater's output signal. To guarantee repeater's stability and signal quality, an ICAN scheme based on an iterative algorithm is subsequently proposed. The simulation results confirm the relationship between the stability and signal quality of the repeater and the impact of the aforementioned factors. Using the proposed ICAN scheme, a mean error vector magnitude (quality indicator) of about 6.3% for the repeater's output signal was achieved.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.E92.B.1778/_p

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@ARTICLE{e92-b_5_1778,
author={Moohong LEE, Byungjik KEUM, Young Serk SHIM, Hwang Soo LEE, },
journal={IEICE TRANSACTIONS on Communications},
title={An Interference Cancellation Scheme for Mobile Communication Radio Repeaters},
year={2009},
volume={E92-B},
number={5},
pages={1778-1785},
abstract={An interference cancellation (ICAN) scheme for mobile communication radio repeaters is presented. When a radio repeater has a gain that is larger than the isolation between its transmit and receive antennas, it oscillates due to feedback interference signals. To prevent feedback oscillation of a radio repeater, we first formulate a feedback oscillation model of the radio repeater and then derive an ICAN model from that model. From the derived ICAN model, we show that the stability and the signal quality of the repeater depend on the repeater's gain and delay, the propagation delay on feedback paths, feedback channel characteristics, and the capability of the feedback channel estimation algorithm. It is also shown that the stability condition of the repeater does not guarantee the quality of the repeater's output signal. To guarantee repeater's stability and signal quality, an ICAN scheme based on an iterative algorithm is subsequently proposed. The simulation results confirm the relationship between the stability and signal quality of the repeater and the impact of the aforementioned factors. Using the proposed ICAN scheme, a mean error vector magnitude (quality indicator) of about 6.3% for the repeater's output signal was achieved.},
keywords={},
doi={10.1587/transcom.E92.B.1778},
ISSN={1745-1345},
month={May},}

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TY - JOUR
TI - An Interference Cancellation Scheme for Mobile Communication Radio Repeaters
T2 - IEICE TRANSACTIONS on Communications
SP - 1778
EP - 1785
AU - Moohong LEE
AU - Byungjik KEUM
AU - Young Serk SHIM
AU - Hwang Soo LEE
PY - 2009
DO - 10.1587/transcom.E92.B.1778
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E92-B
IS - 5
JA - IEICE TRANSACTIONS on Communications
Y1 - May 2009
AB - An interference cancellation (ICAN) scheme for mobile communication radio repeaters is presented. When a radio repeater has a gain that is larger than the isolation between its transmit and receive antennas, it oscillates due to feedback interference signals. To prevent feedback oscillation of a radio repeater, we first formulate a feedback oscillation model of the radio repeater and then derive an ICAN model from that model. From the derived ICAN model, we show that the stability and the signal quality of the repeater depend on the repeater's gain and delay, the propagation delay on feedback paths, feedback channel characteristics, and the capability of the feedback channel estimation algorithm. It is also shown that the stability condition of the repeater does not guarantee the quality of the repeater's output signal. To guarantee repeater's stability and signal quality, an ICAN scheme based on an iterative algorithm is subsequently proposed. The simulation results confirm the relationship between the stability and signal quality of the repeater and the impact of the aforementioned factors. Using the proposed ICAN scheme, a mean error vector magnitude (quality indicator) of about 6.3% for the repeater's output signal was achieved.
ER -