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In fast moving environment, the inter-carrier interference (ICI) due to Doppler spread will degrade the performance of OFDM system severely. Using Jakes' model for the Doppler power spectrum and linear model for time-varying channel during an OFDM symbol interval, the analytical closed- form expression of ICI power, signal-to-interference ratio (SIR) and signal-to-interference-plus-noise ratio (SINR)...
Multiple-input-multiple-output (MIMO) technology can efficiently increase the system capacity in rich scattering environments without increasing the bandwidth or transmission power. The precoder for MIMO transmission is a processing technique that exploits the channel state information (CSI) by operating on the signal before transmission to effectively improve link performance. A hybrid automatic...
In this paper, we study channel estimation methods with various curve fitting techniques for mobile WiMAX system and find that they cannot support high mobility sufficiently. We also propose a channel estimation method which is based on piecewise linear estimation to overcome the problem of high mobility. The performances including mean squared error (MSE) and bit error rate (BER) are compared and...
WiBro (wireless broadband), the standard of high-speed portable internet (HPI) based on OFDMA/TDD and IP network in Korea, is the subset of consolidated version of IEEE 802.16e wireless MAN standard. In this paper, the architecture and key physical layer technologies of WiBro are briefly introduced, whereas the convolutional turbo code (CTC) with high-order modulation is presented in detail. The performance...
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