The Experts below are selected from a list of 57 Experts worldwide ranked by ideXlab platform

Tharmalingam Ratnarajah - One of the best experts on this subject based on the ideXlab platform.

  • doppler effect assisted wireless communication for interference mitigation
    IEEE Transactions on Communications, 2019
    Co-Authors: Dushyantha A Basnayaka, Tharmalingam Ratnarajah
    Abstract:

    Doppler effect is a fundamental phenomenon that appears in wave propagation, where a moving observer experiences dilation or contraction of the wavelength of a wave. It also appears in radio frequency (RF) wireless communication when there exists a relative movement between the transmitter and the receiver, and is widely considered as a major impairment for reliable wireless communication. The current paper proposes Doppler assisted wireless communication (DAWC) that exploits Doppler effect and uses kinetic energy for co-channel interference (CCI) mitigation. The proposed system also exploits the propagation environment and the network topology and consists of an access point (AP) with a rotating drum antenna. The rotating drum receive antenna is designed in such a way that it shifts the interfering Signals away from the Desired Signal Band. This paper includes a detailed system model, and the results show that under favorable fading conditions, CCI can be significantly reduced. Therefore, it is anticipated that more sophisticated wireless systems and networks can be designed by extending the basic ideas proposed herein.

  • doppler effect assisted wireless communication for interference mitigation
    arXiv: Information Theory, 2018
    Co-Authors: Dushyantha A Basnayaka, Tharmalingam Ratnarajah
    Abstract:

    Doppler effect is a fundamental phenomenon that appears in wave propagation, where a moving observer experiences dilation or contraction of wavelength of a wave. It also appears in radio frequency (RF) wireless communication when there exists a relative movement between the transmitter and the receiver, and is widely considered as a major impairment for reliable wireless communication. The current paper proposes Doppler Assisted Wireless Communication that exploits Doppler effect for co-channel interference mitigation. The proposed system also exploits the propagation environment and the network topology, and consists of an access point with a rotating thin drum antenna. The rotating drum receive antenna is designed in such a way that it shifts the interference Signals away from the Desired Signal Band. This paper includes a detailed system model, and the results show that under favourable fading conditions, co-channel interference can be significantly reduced. Therefore, it is anticipated that more sophisticated wireless systems and networks can be designed by extending the basic system proposed herein.

  • GLOBECOM - Doppler Effect Assisted Interference Mitigation for Wireless Communication
    2018 IEEE Global Communications Conference (GLOBECOM), 2018
    Co-Authors: Dushyantha A Basnayaka, Harald Haas, Tharmalingam Ratnarajah
    Abstract:

    Doppler effect is a fundamental phenomenon that appears in wave propagation, where a moving observer experiences dilation or contraction of wavelength of a wave. It also appears in radio frequency (RF) wireless communication when there exists a relative movement between the transmitter and the receiver, and is widely considered as a major impairment for reliable wireless communication. The current paper proposes a wireless receiver that carefully exploits Doppler effect for cochannel interference mitigation. The proposed system-termed as DAIM to stand for Doppler Assisted Interference Mitigation-exploits the propagation environment and the network topology, and consists of an access point with a rotating drum antenna. The rotating drum receive antenna is designed in such a way that it shifts the interference Signals away from the Desired Signal Band. This paper includes a detailed system model and a simulation study. The results show that under favorable fading conditions, co-channel interference can be significantly reduced if not eliminated. Therefore, it is anticipated that more sophisticated wireless systems and networks can be designed by extending the basic system proposed herein.

Dushyantha A Basnayaka - One of the best experts on this subject based on the ideXlab platform.

  • doppler effect assisted wireless communication for interference mitigation
    IEEE Transactions on Communications, 2019
    Co-Authors: Dushyantha A Basnayaka, Tharmalingam Ratnarajah
    Abstract:

    Doppler effect is a fundamental phenomenon that appears in wave propagation, where a moving observer experiences dilation or contraction of the wavelength of a wave. It also appears in radio frequency (RF) wireless communication when there exists a relative movement between the transmitter and the receiver, and is widely considered as a major impairment for reliable wireless communication. The current paper proposes Doppler assisted wireless communication (DAWC) that exploits Doppler effect and uses kinetic energy for co-channel interference (CCI) mitigation. The proposed system also exploits the propagation environment and the network topology and consists of an access point (AP) with a rotating drum antenna. The rotating drum receive antenna is designed in such a way that it shifts the interfering Signals away from the Desired Signal Band. This paper includes a detailed system model, and the results show that under favorable fading conditions, CCI can be significantly reduced. Therefore, it is anticipated that more sophisticated wireless systems and networks can be designed by extending the basic ideas proposed herein.

  • doppler effect assisted wireless communication for interference mitigation
    arXiv: Information Theory, 2018
    Co-Authors: Dushyantha A Basnayaka, Tharmalingam Ratnarajah
    Abstract:

    Doppler effect is a fundamental phenomenon that appears in wave propagation, where a moving observer experiences dilation or contraction of wavelength of a wave. It also appears in radio frequency (RF) wireless communication when there exists a relative movement between the transmitter and the receiver, and is widely considered as a major impairment for reliable wireless communication. The current paper proposes Doppler Assisted Wireless Communication that exploits Doppler effect for co-channel interference mitigation. The proposed system also exploits the propagation environment and the network topology, and consists of an access point with a rotating thin drum antenna. The rotating drum receive antenna is designed in such a way that it shifts the interference Signals away from the Desired Signal Band. This paper includes a detailed system model, and the results show that under favourable fading conditions, co-channel interference can be significantly reduced. Therefore, it is anticipated that more sophisticated wireless systems and networks can be designed by extending the basic system proposed herein.

  • GLOBECOM - Doppler Effect Assisted Interference Mitigation for Wireless Communication
    2018 IEEE Global Communications Conference (GLOBECOM), 2018
    Co-Authors: Dushyantha A Basnayaka, Harald Haas, Tharmalingam Ratnarajah
    Abstract:

    Doppler effect is a fundamental phenomenon that appears in wave propagation, where a moving observer experiences dilation or contraction of wavelength of a wave. It also appears in radio frequency (RF) wireless communication when there exists a relative movement between the transmitter and the receiver, and is widely considered as a major impairment for reliable wireless communication. The current paper proposes a wireless receiver that carefully exploits Doppler effect for cochannel interference mitigation. The proposed system-termed as DAIM to stand for Doppler Assisted Interference Mitigation-exploits the propagation environment and the network topology, and consists of an access point with a rotating drum antenna. The rotating drum receive antenna is designed in such a way that it shifts the interference Signals away from the Desired Signal Band. This paper includes a detailed system model and a simulation study. The results show that under favorable fading conditions, co-channel interference can be significantly reduced if not eliminated. Therefore, it is anticipated that more sophisticated wireless systems and networks can be designed by extending the basic system proposed herein.

Harald Haas - One of the best experts on this subject based on the ideXlab platform.

  • GLOBECOM - Doppler Effect Assisted Interference Mitigation for Wireless Communication
    2018 IEEE Global Communications Conference (GLOBECOM), 2018
    Co-Authors: Dushyantha A Basnayaka, Harald Haas, Tharmalingam Ratnarajah
    Abstract:

    Doppler effect is a fundamental phenomenon that appears in wave propagation, where a moving observer experiences dilation or contraction of wavelength of a wave. It also appears in radio frequency (RF) wireless communication when there exists a relative movement between the transmitter and the receiver, and is widely considered as a major impairment for reliable wireless communication. The current paper proposes a wireless receiver that carefully exploits Doppler effect for cochannel interference mitigation. The proposed system-termed as DAIM to stand for Doppler Assisted Interference Mitigation-exploits the propagation environment and the network topology, and consists of an access point with a rotating drum antenna. The rotating drum receive antenna is designed in such a way that it shifts the interference Signals away from the Desired Signal Band. This paper includes a detailed system model and a simulation study. The results show that under favorable fading conditions, co-channel interference can be significantly reduced if not eliminated. Therefore, it is anticipated that more sophisticated wireless systems and networks can be designed by extending the basic system proposed herein.

Haruo Kobayashi - One of the best experts on this subject based on the ideXlab platform.

  • Noise-Coupled Image Rejection Architecture of Complex Bandpass ΔΣAD Modulator
    IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences, 2010
    Co-Authors: Hao San, Haruo Kobayashi
    Abstract:

    This paper proposes a new realization technique of image rejection function by noise-coupling architecture, which is used for a complex Bandpass ΔΣAD modulator. The complex Bandpass ΔΣAD modulator processes just input I and Q Signals, not image Signals, and the AD conversion can be realized with low power dissipation. It realizes an asymmetric noise-shaped spectra, which is desirable for such low-IF receiver applications. However, the performance of the complex Bandpass ΔΣAD modulator suffers from the mismatch between internal analog I and Q paths. I/Q path mismatch causes an image Signal, and the quantization noise of the mirror image Band aliases into the Desired Signal Band, which degrades the SQNDR (Signal to Quantization Noise and Distortion Ratio) of the modulator. In our proposed modulator architecture, an extra notch for image rejection is realized by noise-coupled topology. We just add some passive capacitors and switches to the modulator; the additional integrator circuit composed of an operational amplifier in the conventional image rejection realization is not necessary. Therefore, the performance of the complex modulator can be effectively raised without additional power dissipation. We have performed simulation with MATLAB to confirm the validity of the proposed architecture. The simulation results show that the proposed architecture can achieve the realization of image-rejection effectively, and improve the SQNDR of the complex Bandpass ΔΣAD modulator.

  • Complex Bandpass ΔΣAD modulator with noise-coupled image rejection
    2009 52nd IEEE International Midwest Symposium on Circuits and Systems, 2009
    Co-Authors: Hao San, Haruo Kobayashi
    Abstract:

    This paper proposes a new realization technique of image rejection function by noise-coupling architecture, which is used for a complex Bandpass ΔΣAD modulator. The complex Bandpass ΔΣAD modulator processes just input I and Q Signals, not image Signals, and the AD conversion can be realized with low power dissipation. It realizes an asymmetric noise-shaped spectra, which is desirable for such low-IF receiver applications. However, the performance of the complex Bandpass ΔΣAD modulator suffers from the mismatch between internal analog I and Q paths. I/Q path mismatch causes an image Signal, and the quantization noise of the mirror image Band aliases into the Desired Signal Band, which degrades the SQNDR (Signal to Quantization Noise and Distortion Ratio) of the modulator. In our proposed modulator architecture, an extra notch for image rejection is realized by noise-coupled topology. We just add some passive capacitors and switches to the modulator; the additional integrator circuit composed of an operation amplifier in the conventional image rejection realization is not necessary. Therefore, the performance of the complex modulator can be effectively raised without additional power dissipation. We have performed simulation with MATLAB to confirm the validity of the proposed architecture. The simulation results show that the proposed architecture can achieve the realization of image-rejection effectively, and improve the SQNDR of the complex Bandpass ΔΣAD modulator.

Chiu-sing Choy - One of the best experts on this subject based on the ideXlab platform.

  • ISCAS - A novel mismatch cancellation and I/Q channel multiplexing scheme for quadrature Bandpass ΔΣ modulators
    2009 IEEE International Symposium on Circuits and Systems, 2009
    Co-Authors: Cheong-fat Chan, Kong-pang Pun, Chiu-sing Choy
    Abstract:

    This paper investigates and resolves in-channel/quadrature channel (I/Q) imbalances in quadrature Band pass delta sigma modulators. These mismatches result in image interference and noise being aliased into the Desired Signal Band, thus degrading the dynamic range of the modulators. A novel dynamic element match shaping scheme is proposed to cancel the aliasing of image interference, noise, and self-image. The simulation results for the proposed scheme show that the SNDR is only degraded by 1.6 dB from the ideal case (without I/Q mismatch). Meanwhile, using the I/Q channel multiplexing technique, operational amplifiers, quantizers, and digital-analog converters can be shared between I/Q channels. As a result, silicon area can be reduced with the same power consumption.