Ricean Fading Channel

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Thomas W. Tedesso - One of the best experts on this subject based on the ideXlab platform.

Christoph Gunther - One of the best experts on this subject based on the ideXlab platform.

  • comment on estimate of Channel capacity in rayleigh Fading environment
    IEEE Transactions on Vehicular Technology, 1996
    Co-Authors: Christoph Gunther
    Abstract:

    Lee (see ibid., vol.39, p.187, no.8, 1990) proposed a very simple and elegant model for estimating the capacity of slowly Fading Channels. A small error in his paper, however, has led to an inexact picture. We correct that inaccuracy. As a consequence, the loss in capacity of a Rayleigh Fading Channel with respect to the additive white Gaussian noise (AWGN) Channel turns out to be negligible for all values of the signal-to-noise ratio that are of interest. Furthermore, we extend the analytical results to the situation with M-branch diversity and Ricean Fading Channels. The lower moments of the associated distributions, i.e., of the /spl chi//sup 2/-distribution (Nakagami with integer m-parameter) and Rice distribution agree when the parameters of the distribution are suitably chosen. With that choice of parameters, the capacities of the M-branch diversity and of the Ricean Fading Channel become almost identical.

N.c. Beaulieu - One of the best experts on this subject based on the ideXlab platform.

  • estimation of Ricean k parameter and local average snr from noisy correlated Channel samples
    IEEE Transactions on Wireless Communications, 2007
    Co-Authors: Yunfei Chen, N.c. Beaulieu
    Abstract:

    The problem of estimating the K parameter and the local average signal-to-noise ratio in a noisy Ricean Fading Channel is studied. Unlike most previous estimators where independent Channel samples are assumed, in this paper, novel estimators that assume correlated Channel samples are proposed. Both data-aided and non-data-aided designs are considered. The performances of the new estimators are examined. Several design issues are discussed. Numerical results are presented to show their good performances in a realistic Ricean Fading Channel

  • ICC - Estimators for K Factor and Local Average SNR Using Noisy Correlated Samples
    2006 IEEE International Conference on Communications, 2006
    Co-Authors: Yunfei Chen, N.c. Beaulieu
    Abstract:

    The problem of estimating the K parameter and the local average signal-to-noise ratio in a noisy Ricean Fading Channel is studied. Unlike previous estimators where independent or noiseless Channel samples are assumed, in this paper, novel estimators are designed to operate with noisy correlated Channel samples. Both data-aided and non-data-aided designs are considered. The performances of the new estimators are examined in detail. Numerical results are presented to show their good performances in a realistic Ricean Fading Channel.

  • Maximum likelihood estimation of the K factor in Ricean Fading Channels
    IEEE Communications Letters, 2005
    Co-Authors: Yunfei Chen, N.c. Beaulieu
    Abstract:

    Estimation of the K factor in a Ricean Fading Channel is studied. Unlike most previous estimators which employ exclusively samples of the Fading envelope, new maximum likelihood estimators that use samples of both the Fading envelope and the Fading phase, or samples of the Fading phase only, are derived and examined. Simulation results show that these estimators have good performances when operating in a Ricean Fading Channel, and in some cases outperform envelope-sample-based estimators.

R C Robertson - One of the best experts on this subject based on the ideXlab platform.

  • performance analysis of quadrature amplitude modulated signals received over a slow flat Ricean Fading Channel
    Military Communications Conference, 2006
    Co-Authors: Frank Kragh, R C Robertson
    Abstract:

    Exact analytic solutions are developed for the probability of bit error for a quadrature amplitude modulated signal when the signal is transmitted over a slow, flat Ricean Fading Channel. New analytic techniques are used for increased accuracy and, where applicable, are compared to the usual approximations.

  • Multiple tone interference of frequency-hopped noncoherent MFSK signals transmitted over Ricean Fading Channels
    IEEE Transactions on Communications, 1996
    Co-Authors: R C Robertson, J. Sheltry
    Abstract:

    This paper investigates the performance degradation resulting from multitone interference of orthogonal, frequency-hopped, noncoherent M-ary frequency-shift keyed receivers (FH/MFSK) where the effect of thermal and other wideband noise is not neglected. The multiple, equal power jamming tones are assumed to correspond to some or all of the possible FH M-ary orthogonal signaling tones. Furthermore, the Channel is modeled as a Ricean Fading Channel; and both the signaling tones and the multiple interference tones are assumed to be affected by Channel Fading. It is also assumed that Channel Fading need not necessarily affect the signaling tones and the interference tones in the same-way. When the information signal power exceeds the power of the individual interference tones, poorer overall system performance is obtained when the multiple interfering tones experience Fading. This trend is accentuated as M increases. When the information signal experiences Fading, the effect of Fading multiple interference tones on overall system performance lessens, and for a Rayleigh-faded information signal, Fading of the multiple interference tones has no effect on overall system performance regardless of M.

  • Multiple tone interference of frequency-hopped noncoherent MFSK signals transmitted over Ricean Fading Channels
    Proceedings of MILCOM '95, 1
    Co-Authors: R C Robertson, J. Sheltry
    Abstract:

    This paper investigates the performance degradation resulting from multitone interference of orthogonal, noncoherent frequency-hopped M-ary frequency-shift keyed receivers (FH/MFSK) where the effect of thermal and other wideband noise is not neglected. The multiple, equal power jamming tones are assumed to correspond to some or all of the possible FH M-ary orthogonal signaling tones. Furthermore, the Channel is modeled as a Ricean Fading Channel, a possibility precluded when thermal noise is neglected; and both the signaling tones and the multiple interference tones are assumed to be affected by Channel Fading. Only band multitone interference is considered, and it is assumed that jammed hop bands contain a single interfering tone at one of the M possible signaling frequencies. When the information signal is not affected by Fading but the multiple interference tones are, the effect on the overall performance of the FH/MFSK system is very small when the power of the individual interference tones is greater than or equal to the information signal power. When the information signal power exceeds the power of the individual interference tones, the counterintuitive result of poorer overall system performance when the multiple interfering tones experience Fading as compared with when they do not, is obtained. This trend is accentuated as M increases. When the information signal experiences Fading, the effect of Fading multiple interference tones on overall system performance lessens, and for a Rayleigh faded information signal, Fading of the multiple interference tones has no effect on overall system performance regardless of M.

Rugui Yao - One of the best experts on this subject based on the ideXlab platform.

  • accurate approximation of zf massive mimo Channel rate with a finite antenna over Ricean Fading Channel
    IEEE Access, 2018
    Co-Authors: James Kweku Nkrumah Nyarko, Jian Xie, Rugui Yao, Yuexian Wang, Ling Wang
    Abstract:

    In a typical downlink massive multiple-input and multiple-output (massive MIMO) system, the available degree of freedom (DoF) and multiplexing gain improve the Channel rate. However, while a finite base station (BS) antenna limits the DoF, the line of sight (LoS) component decreases the multiplexing gain as a result of reducing the rank of the Ricean Channel matrix. This paper provides the simple and tight approximations of the massive MIMO Channel rate using the zero-forcing (ZF) precoding over the Ricean Fading Channel and with a finite antenna. We derive an accurate approximation of the ZF Ricean Channel covariance matrix by exploiting the arbitrary-rank Channel mean. This allows the ZF precoding to focus on the nonzero eigenmode of the correlation matrix in order to improve the Channel gain. Subsequently, we deduce the first-, second- and third-eigenvalue moments. We then obtain an asymptotic series expansion in the closed-form expressions of the ZF achievable rates. Numerical results confirm the accuracy of the approximations, as the approximated ZF achievable rates converge to the ideal Channel rate. In particular, the convergence shows a dependence on the Ricean factor and effective signal-to-noise ratio (SNR), while a finite BS antenna in ZF massive MIMO Channel offers the required diversity order.

  • A Novel Simulation Model With Correct Statistical Properties For Ricean Fading Channels
    2006 International Conference on Communications Circuits and Systems, 2006
    Co-Authors: Rugui Yao, Yongsheng Wang
    Abstract:

    A novel simulation model is proposed by investigating the characteristics of Ricean Fading Channel. We deduce the second-order and high-order statistical properties, including the probability density functions (PDF) of envelope and phase, as well as the level crossing rate (LCR) and average Fading duration (AFD) for this model. From the deduction, the correct statistical properties of the proposed model are stationary in the wide sense. Moreover, the Fading phases are uniformly distributed and mutually independent with the distribution of envelope. The simulation results further illuminate that the statistical properties of the proposed model are consistent with theoretical ones. Compared with existing models in [5-7], the proposed model is more effective and efficient in simulation for its much fewer random variables and less computation complexity.

  • WCNC - A novel simulation model with correct statistical properties for Ricean Fading Channels
    IEEE Wireless Communications and Networking Conference 2006. WCNC 2006., 2006
    Co-Authors: Rugui Yao, Yongsheng Wang
    Abstract:

    A novel simulation model is proposed by investigating the characteristic of Ricean Fading Channel. We deduce the second-order and high-order statistical properties, the probability density functions (PDF) of envelope and phase, as well as the level crossing rate (LCR) and average Fading duration (AFD) for this model. From the deduction, the correct statistical properties of the proposed model are stationary in the wide sense. Moreover, the Fading phases are uniformly distributed and mutually independent with the distribution of envelope. The simulation results further illuminate that the statistical properties of the proposed model are consistent with theoretical ones. Compared with all the existing models, the proposed model is more effective and efficient in simulation for its much fewer random variables and less computation complexity

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