The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform

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

  • mmse Frequency domain equalization using spectrum combining for nyquist filtered broadband single carrier transmission
    Vehicular Technology Conference, 2010
    Co-Authors: Suguru Okuyama, Kazuki Takeda, Fumiyuki Adachi
    Abstract:

    Single carrier (SC) signal transmission has a property of low peak-to-average power ratio (PAPR) and achieves the Frequency Diversity gain by the use of Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion. In this paper, Nyquist filtered broadband SC transmission is considered. As the transmit filter roll-off factor α increases, the signal bandwidth increases and the PAPR reduces. MMSE-FDE using spectrum combining was proposed in [15]. An additional Frequency Diversity gain can be obtained by making use of the excess bandwidth introduced by the transmit filter and by using spectrum combining. In this paper, we thoroughly investigate how α affects PAPR, BER performance, and throughput performance.

  • introduction of Frequency domain signal processing to broadband single carrier transmissions in a wireless channel
    IEICE Transactions on Communications, 2009
    Co-Authors: Fumiyuki Adachi, Hiromichi Tomeba, Kazuki Takeda
    Abstract:

    Recently, Frequency-domain equalization (FDE) has been attracting much attention as a way to improve single-carrier (SC) signal transmission in a Frequency-selective wireless channel. Since the SC signal spectrum is spread over the entire signal bandwidth, FDE can take advantage of channel Frequency-selectivity and achieve the Frequency Diversity gain. SC with FDE is a promising wireless signal transmission technique. In this article, we review the pioneering research done on SC with FDE. The principles of simple one-tap FDE, channel estimation, and residual inter-symbol interference (ISI) cancellation are presented. Multi-input/multi-output (MIMO) is an important technique to improve the transmission performance. Some of the studies on MIMO/SC with FDE are introduced.

  • Frequency domain equalization for broadband single carrier multiple access
    IEICE Transactions on Communications, 2009
    Co-Authors: Fumiyuki Adachi, Hiromichi Tomeba, Kazuki Takeda
    Abstract:

    SUMMARY Single-carrier (SC) multiple access is a promising uplink multiple access technique because of its low peak-to-average power ratio (PAPR) property and high Frequency Diversity gain that is achievable through simple one-tap Frequency-domain equalization (FDE) in a strong Frequency-selective channel. The multiple access capability can be obtained by combining either Frequency division multiple access (FDMA) or code division multiple access (CDMA) with SC transmission. In this article, we review the recent research on the SC multiple access techniques with one-tap FDE. After introducing the principle of joint FDE/antenna Diversity combining, we review various SC multiple access techniques with one-tap FDE, i.e., SC-FDMA, SC-CDMA, block spread CDMA, and

Antonia Maria Tulino - One of the best experts on this subject based on the ideXlab platform.

  • capacity of multiple transmit multiple receive antenna
    2002
    Co-Authors: Angel Lozano, Antonia Maria Tulino
    Abstract:

    The capacity of wireless communication architectures equipped with multiple transmit and receive antennas and impaired by both noise and cochannel interference is studied. We find a closed-form solution for the capacity in the limit of a large number of antennas. This asymptotic solution, which is a sole function of the relative number of transmit and receive antennas and the signal-to-noise and signal-to-inter- ference ratios (SNR and SIR), is then particularized to a number of cases of interest. By verifying that antenna Diversity can substitute for time and/or Frequency Diversity at providing ergodicity, we show that these asymptotic solutions approximate the ergodic capacity very closely even when the number of antennas is very small.

  • Capacity of multiple-transmit multiple-receive antenna architectures
    IEEE Transactions on Information Theory, 2002
    Co-Authors: Angel Lozano, Antonia Maria Tulino
    Abstract:

    The capacity of wireless communication architectures equipped with multiple transmit and receive antennas and impaired by both noise and cochannel interference is studied. We find a closed-form solution for the capacity in the limit of a large number of antennas. This asymptotic solution, which is a sole function of the relative number of transmit and receive antennas and the signal-to-noise and signal-to-interference ratios (SNR and SIR), is then particularized to a number of cases of interest. By verifying that antenna Diversity one can substitute for time and/or Frequency Diversity at providing ergodicity, we show that these asymptotic solutions approximate the ergodic capacity very closely even when the number of antennas is very small.

Ghassan Kawas Kaleh - One of the best experts on this subject based on the ideXlab platform.

  • Frequency Diversity spread spectrum communication system to counter bandlimited gaussian interference
    IEEE Transactions on Communications, 1996
    Co-Authors: Ghassan Kawas Kaleh
    Abstract:

    A spread spectrum system to counter bandlimited Gaussian interference is proposed. The optimum receiver for this system is easy to build. Frequency Diversity which allows the receiver to distinguish unjammed signal replicas from their jammed versions is used. The system can also resist bandlimited partial-time jamming. The only choice left to a smart jammer to maximize the error probability is to spread its signal like the communicator. The optimum receiver, which jointly performs symbol detection and interference rejection, is derived. Side information needed by this receiver can easily be estimated. However, if the interference bandwidth is narrow compared to the signal bandwidth, side information on noise and interference levels is not needed by a simpler and near-optimum receiver. Bit-error probability is evaluated for quaternary phase shift keying (QPSK) modulation and compared to that of direct sequence spread spectrum. We also propose the use of polyphase filters for simple system implementation.

Kazuki Takeda - One of the best experts on this subject based on the ideXlab platform.

  • mmse Frequency domain equalization using spectrum combining for nyquist filtered broadband single carrier transmission
    Vehicular Technology Conference, 2010
    Co-Authors: Suguru Okuyama, Kazuki Takeda, Fumiyuki Adachi
    Abstract:

    Single carrier (SC) signal transmission has a property of low peak-to-average power ratio (PAPR) and achieves the Frequency Diversity gain by the use of Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion. In this paper, Nyquist filtered broadband SC transmission is considered. As the transmit filter roll-off factor α increases, the signal bandwidth increases and the PAPR reduces. MMSE-FDE using spectrum combining was proposed in [15]. An additional Frequency Diversity gain can be obtained by making use of the excess bandwidth introduced by the transmit filter and by using spectrum combining. In this paper, we thoroughly investigate how α affects PAPR, BER performance, and throughput performance.

  • introduction of Frequency domain signal processing to broadband single carrier transmissions in a wireless channel
    IEICE Transactions on Communications, 2009
    Co-Authors: Fumiyuki Adachi, Hiromichi Tomeba, Kazuki Takeda
    Abstract:

    Recently, Frequency-domain equalization (FDE) has been attracting much attention as a way to improve single-carrier (SC) signal transmission in a Frequency-selective wireless channel. Since the SC signal spectrum is spread over the entire signal bandwidth, FDE can take advantage of channel Frequency-selectivity and achieve the Frequency Diversity gain. SC with FDE is a promising wireless signal transmission technique. In this article, we review the pioneering research done on SC with FDE. The principles of simple one-tap FDE, channel estimation, and residual inter-symbol interference (ISI) cancellation are presented. Multi-input/multi-output (MIMO) is an important technique to improve the transmission performance. Some of the studies on MIMO/SC with FDE are introduced.

  • Frequency domain equalization for broadband single carrier multiple access
    IEICE Transactions on Communications, 2009
    Co-Authors: Fumiyuki Adachi, Hiromichi Tomeba, Kazuki Takeda
    Abstract:

    SUMMARY Single-carrier (SC) multiple access is a promising uplink multiple access technique because of its low peak-to-average power ratio (PAPR) property and high Frequency Diversity gain that is achievable through simple one-tap Frequency-domain equalization (FDE) in a strong Frequency-selective channel. The multiple access capability can be obtained by combining either Frequency division multiple access (FDMA) or code division multiple access (CDMA) with SC transmission. In this article, we review the recent research on the SC multiple access techniques with one-tap FDE. After introducing the principle of joint FDE/antenna Diversity combining, we review various SC multiple access techniques with one-tap FDE, i.e., SC-FDMA, SC-CDMA, block spread CDMA, and

Angel Lozano - One of the best experts on this subject based on the ideXlab platform.

  • capacity of multiple transmit multiple receive antenna
    2002
    Co-Authors: Angel Lozano, Antonia Maria Tulino
    Abstract:

    The capacity of wireless communication architectures equipped with multiple transmit and receive antennas and impaired by both noise and cochannel interference is studied. We find a closed-form solution for the capacity in the limit of a large number of antennas. This asymptotic solution, which is a sole function of the relative number of transmit and receive antennas and the signal-to-noise and signal-to-inter- ference ratios (SNR and SIR), is then particularized to a number of cases of interest. By verifying that antenna Diversity can substitute for time and/or Frequency Diversity at providing ergodicity, we show that these asymptotic solutions approximate the ergodic capacity very closely even when the number of antennas is very small.

  • Capacity of multiple-transmit multiple-receive antenna architectures
    IEEE Transactions on Information Theory, 2002
    Co-Authors: Angel Lozano, Antonia Maria Tulino
    Abstract:

    The capacity of wireless communication architectures equipped with multiple transmit and receive antennas and impaired by both noise and cochannel interference is studied. We find a closed-form solution for the capacity in the limit of a large number of antennas. This asymptotic solution, which is a sole function of the relative number of transmit and receive antennas and the signal-to-noise and signal-to-interference ratios (SNR and SIR), is then particularized to a number of cases of interest. By verifying that antenna Diversity one can substitute for time and/or Frequency Diversity at providing ergodicity, we show that these asymptotic solutions approximate the ergodic capacity very closely even when the number of antennas is very small.