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Stefan Lindenmeier – One of the best experts on this subject based on the ideXlab platform.

  • Automotive Antenna Diversity system for satellite radio with high phase accuracy in low SNR-scenarios
    International Journal of Microwave and Wireless Technologies, 2018
    Co-Authors: S. Senega, A. Nassar, Stefan Lindenmeier

    Abstract:

    AbstractFor a fast scan-phase satellite radio Antenna Diversity system a noise correction method is presented for a significant improvement of audio availability at low signal-to-noise ratio (SNR) conditions. An error analysis of the level and phase detection within the Diversity system in the presence of noise leads to a correction method based on a priori knowledge of the system’s noise floor. This method is described and applied in a hardware example of a satellite digital audio radio services Antenna Diversity circuit for fast fading conditions. Test drives, which have been performed in real fading scenarios, are described and results are analyzed statistically. Simulations of the scan-phase Antenna Diversity system show higher signal amplitudes and availabilities. Measurement results of dislocated Antennas as well as of a Diversity Antenna set on a single mounting position are presented. A comparison of a Diversity system with noise correction, the same system without noise correction, and a single Antenna system with each other is performed. Using this new method in fast multipath fading driving scenarios underneath dense foliage with a low SNR of the Antenna signals, a reduction in audio mute time by one order of magnitude compared with single Antenna systems is achieved with the Diversity system.

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  • New Compact Antenna Diversity with a Fully Integrated Microwave Circuit for Automotive Satellite Radio Reception
    2018 13th European Microwave Integrated Circuits Conference (EuMIC), 2018
    Co-Authors: S. Senega, A. Nassar, Robert Weigel, Jvrgen Rober, Christian Heuert, Stefan Lindenmeier

    Abstract:

    A compact Antenna Diversity system with a new integrated circuit is presented for automotive reception of satellite digital audio radio services (SDARS) at 2.3 GHz. For a scan-phase Antenna Diversity with switching and phase alignment of up to three Antenna paths, the integrated circuit includes RF switches, phase-alignment and signal combining as well as the frequency conversion for level detection. This is the first integrated circuit for SDARS scan-phase Antenna Diversity, which includes all the Diversity functions except for level detection and digital signal processing. With the integrated circuit with a package size of only 9 mm by 9 mm a compact hardware demonstrator is realized. The Diversity circuit is independent of the radio and offers the same interface to the radio as a conventional single Antenna. In laboratory measurements characteristic values of the RF signal paths like gain and variable phase shift are determined. In addition, the new compact Diversity circuit is also evaluated in a real fading scenario on a single side mirror of the test vehicle showing a significant reduction of audio mutes by the Diversity system compared to single Antenna reception.

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  • Characterization of a new integrated scan-phase Antenna Diversity circuit for automotive satellite radio reception
    2016 46th European Microwave Conference (EuMC), 2016
    Co-Authors: S. Senega, Juergen Roeber, A. Nassar, Robert Weigel, Christian Heuer, Stefan Lindenmeier

    Abstract:

    An integrated Antenna Diversity system is described which enables a high increase of reception performance for satellite digital audio radio services (SDARS). A detailed analysis is given for the gain and noise figure requirements specifically regarding the implementation in an integrated circuit. On base of this analysis a hardware demonstrator of the scan-phase Antenna Diversity system is realized in which the phase aligned rf combining and signal selection is implemented completely in a compact IC with a package size of only 8 mm by 8 mm. For evaluation the integrated scan-phase Antenna Diversity system is fed by different Antenna signals of real test drives in the US. The Diversity system proves its functionality in reducing the overall time of audio mutes by almost one order in magnitude compared to standard single Antennas.

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S. Senega – One of the best experts on this subject based on the ideXlab platform.

  • Automotive Antenna Diversity system for satellite radio with high phase accuracy in low SNR-scenarios
    International Journal of Microwave and Wireless Technologies, 2018
    Co-Authors: S. Senega, A. Nassar, Stefan Lindenmeier

    Abstract:

    AbstractFor a fast scan-phase satellite radio Antenna Diversity system a noise correction method is presented for a significant improvement of audio availability at low signal-to-noise ratio (SNR) conditions. An error analysis of the level and phase detection within the Diversity system in the presence of noise leads to a correction method based on a priori knowledge of the system’s noise floor. This method is described and applied in a hardware example of a satellite digital audio radio services Antenna Diversity circuit for fast fading conditions. Test drives, which have been performed in real fading scenarios, are described and results are analyzed statistically. Simulations of the scan-phase Antenna Diversity system show higher signal amplitudes and availabilities. Measurement results of dislocated Antennas as well as of a Diversity Antenna set on a single mounting position are presented. A comparison of a Diversity system with noise correction, the same system without noise correction, and a single Antenna system with each other is performed. Using this new method in fast multipath fading driving scenarios underneath dense foliage with a low SNR of the Antenna signals, a reduction in audio mute time by one order of magnitude compared with single Antenna systems is achieved with the Diversity system.

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  • New Compact Antenna Diversity with a Fully Integrated Microwave Circuit for Automotive Satellite Radio Reception
    2018 13th European Microwave Integrated Circuits Conference (EuMIC), 2018
    Co-Authors: S. Senega, A. Nassar, Robert Weigel, Jvrgen Rober, Christian Heuert, Stefan Lindenmeier

    Abstract:

    A compact Antenna Diversity system with a new integrated circuit is presented for automotive reception of satellite digital audio radio services (SDARS) at 2.3 GHz. For a scan-phase Antenna Diversity with switching and phase alignment of up to three Antenna paths, the integrated circuit includes RF switches, phase-alignment and signal combining as well as the frequency conversion for level detection. This is the first integrated circuit for SDARS scan-phase Antenna Diversity, which includes all the Diversity functions except for level detection and digital signal processing. With the integrated circuit with a package size of only 9 mm by 9 mm a compact hardware demonstrator is realized. The Diversity circuit is independent of the radio and offers the same interface to the radio as a conventional single Antenna. In laboratory measurements characteristic values of the RF signal paths like gain and variable phase shift are determined. In addition, the new compact Diversity circuit is also evaluated in a real fading scenario on a single side mirror of the test vehicle showing a significant reduction of audio mutes by the Diversity system compared to single Antenna reception.

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  • Characterization of a new integrated scan-phase Antenna Diversity circuit for automotive satellite radio reception
    2016 46th European Microwave Conference (EuMC), 2016
    Co-Authors: S. Senega, Juergen Roeber, A. Nassar, Robert Weigel, Christian Heuer, Stefan Lindenmeier

    Abstract:

    An integrated Antenna Diversity system is described which enables a high increase of reception performance for satellite digital audio radio services (SDARS). A detailed analysis is given for the gain and noise figure requirements specifically regarding the implementation in an integrated circuit. On base of this analysis a hardware demonstrator of the scan-phase Antenna Diversity system is realized in which the phase aligned rf combining and signal selection is implemented completely in a compact IC with a package size of only 8 mm by 8 mm. For evaluation the integrated scan-phase Antenna Diversity system is fed by different Antenna signals of real test drives in the US. The Diversity system proves its functionality in reducing the overall time of audio mutes by almost one order in magnitude compared to standard single Antennas.

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Fumiyuki Adachi – One of the best experts on this subject based on the ideXlab platform.

  • VTC Fall – A Novel Analog Signal Transmission Using Joint Space-Time Transmit Diversity and Receive Antenna Diversity
    2014 IEEE 80th Vehicular Technology Conference (VTC2014-Fall), 2014
    Co-Authors: Shinya Kumagai, Fumiyuki Adachi

    Abstract:

    ‡ Abstract—Recently, we proposed a novel analog signal transmission technique called analog single-carrier transmission with frequency-domain equalization (analog SC-FDE) and showed that analog SC-FDE achieves better normalized mean square error (NMSE) performance than conventional analog signal transmission. In order to achieve further performance improvement, transmit/receive Antenna Diversity technique is effective. In digital wireless communications, joint space-time transmit Diversity (STTD) and receive Antenna Diversity is well known as a promising Antenna Diversity technique which achieves a high Diversity order (equal to the product of the number of transmit Antennas and the number of receive Antennas) with a simple signal processing. In this paper, analog SC-FDE using joint STTD and receive Antenna Diversity is proposed. A theoretical analysis of the NMSE performance is derived to evaluate the transmission performance of the proposed scheme and is confirmed by computer simulation. We show that joint STTD and receive Antenna Diversity can significantly improve the NMSE performance of our proposed analog SC- FDE.

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  • SINGLE-CARRIER TRANSMISSION USING QRM-MLD WITH Antenna Diversity
    , 2009
    Co-Authors: Tetsuya Yamamoto Kazuki Takeda, Fumiyuki Adachi

    Abstract:

    The frequency-domain received single-carrier (SC) signal can be expressed using the matrix representation similar to the multiple-input multiple-output (MIMO) multiplexing. The signal detection schemes developed for MIMO multiplexing can be applied to the SC transmissions. In this paper, we apply maximum likelihood detection employing QR decomposition and M-algorithm (QRM-MLD) to the SC signal detection with Antenna Diversity reception. We show that by using Antenna Diversity reception, the number of surviving symbol candidates can be reduced. We evaluate, by the computer simulation, the bit error rate (BER) performance achievable by QRM-MLD and compare it with that achievable by the Vertical-Bell Laboratories Layered spacetime architecture (V-BLAST) detection.

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  • joint frequency domain equalization and Antenna Diversity combining for orthogonal multicode ds cdma signal transmissions in a frequency selective fading channel
    IEICE Transactions on Communications, 2004
    Co-Authors: T Itagaki, Fumiyuki Adachi

    Abstract:

    Orthogonal multicode direct sequence code division multiple access (DS-CDMA) has the flexibility in offering various data rate services. However, in a frequency-selective fading channel, the bit error rate (BER) performance is severely degraded since the othogonality among spreading codes is partially lost. In this paper, we apply frequency-domain equalization and Antenna Diversity combining, used in multi-carrier CDMA (MC-CDMA), to orthogonal multicode DS-CDMA in order to restore the code othogonality while achieving frequency and Antenna Diversity effect. It is found by computer simulations that the joint use of frequency-domain equalization and Antenna Diversity combining can significantly improve the BER performance of orthogonal multicode DS-CDMA in a frequencyselective fading channel. key words: frequency-domain equalization, Antenna Diversity, multicode DS-CDMA, frequency-selective fading

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