Conference Paper

An Algorithm for Estimation and Tracking of Distributed Diffuse Scattering in Mobile Radio Channels

Signal Process. Lab., Helsinki Univ. of Technol., Espoo
DOI: 10.1109/SPAWC.2006.346497 Conference: Signal Processing Advances in Wireless Communications, 2006. SPAWC '06. IEEE 7th Workshop on
Source: IEEE Xplore

ABSTRACT Future wireless communication systems will exploit the rich spatial and temporal dispersion of the radio propagation environment. This requires new advanced channel models, which need to be verified by real-world channel sounding measurements. In this context the reliable estimation and tracking of the model parameters from measurement data is of particular interest. In this paper, we build a state-space model, and track the parameters of the distributed diffuse scattering component of the mobile radio channel using the extended Kalman Filter. The extended Kalman Filter is applied to capture the dynamics of the channel parameters in time and to reduce the computational complexity of the estimator compared to existing estimators. The proposed estimator can be combined with existing techniques for the estimation of specular/concentrated propagation paths, which are based on the maximum likelihood approach (SAGE/RIMAX) or the Kalman Filter. The performance of the algorithm is demonstrated using both simulated and measured data

1 Follower
  • [Show abstract] [Hide abstract]
    ABSTRACT: Propagation channel models serve as input to MIMO system-level simulations. Present-day standard models capture the spatial domain by directions of arrival and departure of individual multipath components, and by the angular spread of clusters of such components. Fully polarimetric, sophisticated measurement campaigns have provided model parameters for a large number of wireless communication scenarios, including the statistics of these parameters. Challenges remain in the areas of interference modeling, of body-worn and sensor networks, of highly non-stationary channels, of diffuse scattering, and of over-the-air testing of MIMO terminals.
    Antennas and Propagation (EuCAP), 2013 7th European Conference on; 01/2013
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: A model parameterization and validation is proposed for specular-diffuse clustered channel models. The double-directional model parameters, based on an experimental measurement campaign, are presented. The specular-diffuse model is validated with regard to the following validation metrics: mutual information, singular values, Demmel condition number and ellipticity. A good agreement is observed when comparing the model with experimental measurements. Finally, the influence of the diffuse multipath component on the performance of the model validation is evaluated.
    IEEE Transactions on Antennas and Propagation 08/2012; 60(8):4019-4022. DOI:10.1109/TAP.2012.2201095 · 2.46 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: This paper presents practical time synchronization algorithm for mobile channel in wireless orthogonal frequency division multiplexing (OFDM) system such as 3G-LTE [1]. We first analyze the method of general time synchronization algorithm in OFDM systems. The analysis will show that the calculated time value for synchronization is unstable and inadequate. This instability of synchronization time value is generated by the variation of multipath channel in which max power path is changed with time. We show how proposed algorithm reduces the instability of synchronization time. Results of simulation show that proposed algorithm reduces the instability of synchronization time and improve time tracking performance considerably. Consequently demodulation performance is also enhanced and overall communication system can operate more efficiently. Because proposed timing synchronization algorithm decides synchronization time considering channel characteristics, controlled synchronization time is extremely stable. Especially, 16-QAM and 64-QAM modulation schemes for high data rate transmission is more sensitive to timing error, therefore proposed time synchronization algorithm supports to keep high data rate system performance stable.
    Computer Communications and Networks (ICCCN), 2012 21st International Conference on; 01/2012