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The communication channels in many practical scenarios, e.g., in industrial indoor environments can be modeled through Rician fading. Such a channel is characterized by its mean pathloss and Rician K factor. The computation of these parameters is essential for optimum power allocation, especially for wireless sensor networks consisting of energy-constrained battery-driven nodes. The most promising...
Accurate estimation of the doubly selective mobile radio channels is essential to achieve satisfactory performance in wideband wireless communication systems like 3GPP LTE. Pilot Assisted Channel Estimation (PACE) techniques like Linear Minimum Mean Squared Error (LMMSE), Least Square (LS) etc. are used to estimate the channel states at a certain time-frequency grid specified by the pilot symbols...
The Basis Expansion Model (BEM) is often employed to track the time variant multipath channels. Using an accurate estimation of the Doppler spread for the BEM gives better channel tracking performance for very high speed vehicles [1]. We propose a modification of the conventional BEM for 3GPP LTE systems which is independent from the Doppler spread for all realistic speeds. It shows no significant...
The main targets for the next generation of mobile communication systems, with LTE as a main candidate, are increased data rates and improved spectrum efficiency. The transmission scheme for the LTE downlink is OFDM which enables the design of low complexity and high performance receivers, if the channel is time-invariant. However in high-mobility scenarios, where the channel is time-variant, the...
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