Wireless Communication Channel Model Research Articles

Soft-Input Turbo Channel Estimation for Single-Carrier Multiple-Input–Multiple-Output Systems

We investigate soft-input Turbo channel estimation for multiple-input-multiple-output (MIMO) systems with single-carrier (SC) frequency-domain equalization (FDE), based on the Kalman filtering and normalized recursive least-squares (NRLS) criteria. Under each criterion, structured channel estimation (SCE) is developed, which exploits the correlation between adjacent frequency bins, and achieves a close performance to the case with perfect channel state information (CSI). An intensive performance analysis is provided in terms of the mean square error (MSE) of channel estimation, which provides a good match with the numerical results. Given a practical channel model for wireless communications, Turbo NRLS SCE (TNRLS-SCE) outperforms Turbo Kalman SCE (TK-SCE) in terms of the steady-state MSE, with a wide range of root-mean-square (RMS) delay spreads and a medium-to-high Doppler spread.

Inter-Chip Wireless Communication Channel: Measurement, Characterization, and Modeling

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> Wireless chip area network (WCAN) that realizes wireless interconnects within a chip (intra-chip) or among chips (inter-chip) represents a new development in wireless communications. WCAN features unique intra- and inter-chip wireless channels. This paper focuses on understanding of inter-chip wireless communication channels in computer cases. Inter-chip wireless communication channel is characterized for the first time based on measurements conducted in frequency domain inside a computer case on a laboratory workbench. A novel technique for doubling the time-domain resolution is proposed for converting the frequency-domain data to time-domain using inverse discrete Fourier transform (IDFT). It is found that path loss factor is 1.607 for case closed and energy follows lognormal distribution in small scale. Based on analysis in practical situations, channel models are developed and simulated. Comparison between model-generated and empirical data shows that simulated channel responses closely match experimental data. Further more, sampled data in different computer cases give consistent results, making the work presented a representative channel model for wireless inter-chip communication. </para>

Channel model for wireless communication around human body

A channel model for a wireless body area network at 400 MHz, 900 MHz and 2.4 GHz is derived. The electromagnetic wave propagation around the body is simulated with a finite-difference time-domain simulator. Creeping waves were identified as the propagation path around the body. Its impact on the delay spread in an indoor environment is discussed.

Channel model for satellite indoor communication, system design

In this paper the development of a channel model for wireless indoor communication, specifically with regard to indoor retransmission of satellite signals and reception by fixed and portable receivers in the L band, is described. The study is confined to the channel model, though it does not include the assessment of particular transmission forms. The theories and approaches used in the model are mainly derived from the field of mobile communication. They are combined to a straightforward chain from large- to small-scale variations yielding information about the several stages of fading. One of the features is the evaluation of the complex field distribution across a local area that can be transformed into a time-varying fading when assuming a moving receiver or a non-stationary environment. © 1998 John Wiley & Sons, Ltd.

Channel model for satellite indoor communication, system design

In this paper the development of a channel model for wireless indoor communication, specifically with regard to indoor retransmission of satellite signals and reception by fixed and portable receivers in the L band, is described. The study is confined to the channel model, though it does not include the assessment of particular transmission forms. The theories and approaches used in the model are mainly derived from the field of mobile communication. They are combined to a straightforward chain from large- to small-scale variations yielding information about the several stages of fading. One of the features is the evaluation of the complex field distribution across a local area that can be transformed into a time-varying fading when assuming a moving receiver or a non-stationary environment. © 1998 John Wiley & Sons, Ltd.