OFDM Channel Estimation and Signal Detection on Nonintegral-Delay and Fast Time-Varying Channels
RSKT '09 Proceedings of the 4th International Conference on Rough Sets and Knowledge Technology
Iterative MAP equalization and decoding in wireless mobile coded OFDM
IEEE Transactions on Communications
IEEE Transactions on Signal Processing
Adaptive time interpolator for OFDM systems in time-variant channels
RWS'09 Proceedings of the 4th international conference on Radio and wireless symposium
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
Compressive cooperative sensing and mapping in mobile networks
ACC'09 Proceedings of the 2009 conference on American Control Conference
Mobile television receivers: a free-to-air overview
IEEE Communications Magazine
Pilot-assisted channel estimation method for OFDMA systems over time-varying channels
IEEE Communications Letters
EURASIP Journal on Wireless Communications and Networking - 3GPP LTE and LTE Advanced
Correlative coding based channel estimation for practical OFDM systems over time varying channels
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
An MIMO-OFDM baseband engine for high mobility environment
APCC'09 Proceedings of the 15th Asia-Pacific conference on Communications
EURASIP Journal on Wireless Communications and Networking
Bayesian Cramer-Rao bound for OFDM rapidly time-varying channel complex gains estimation
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Low-complexity OFDM channel estimation in the presence of I/Q imbalance and phase noise
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Channel estimation for OFDM system with two training symbols aided and polynomial fitting
IEEE Transactions on Communications
PIC-based iterative SDR detector for OFDM systems in doubly-selective fading channels
IEEE Transactions on Wireless Communications
Reduced-complexity baseband compensation of joint Tx/Rx I/Q imbalance in mobile MIMO-OFDM
IEEE Transactions on Wireless Communications
IEEE Transactions on Signal Processing
IEEE Transactions on Communications
Fast algorithms in slow and high Doppler mobile environments
IEEE Transactions on Wireless Communications
Two-step channel estimation scheme for OFDM systems over fast rayleigh fading channels
IEEE Communications Letters
Joint data QR-detection and Kalman estimation for OFDM time-varying Rayleigh channel complex gains
IEEE Transactions on Communications
A model reduction approach for OFDM channel estimation under high mobility conditions
IEEE Transactions on Signal Processing
An efficient channel estimation algorithm under narrow-band jamming for OFDM systems
MILCOM'06 Proceedings of the 2006 IEEE conference on Military communications
New OFDM channel estimation with dual-ICI cancellation in highly mobile channel
IEEE Transactions on Wireless Communications
IEEE Transactions on Wireless Communications
Time-varying channel estimation for OFDM with extended observation window
Proceedings of the ninth ACM international workshop on Vehicular inter-networking, systems, and applications
Iterative Decomposed OFDM Channel Estimation Algorithm Over Highly Mobile Channels
Wireless Personal Communications: An International Journal
Wireless Personal Communications: An International Journal
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Orthogonal frequency-division multiplexing (OFDM) is robust against frequency selective fading due to the increase of the symbol duration. However, for mobile applications channel time-variations in one OFDM symbol introduce intercarrier-interference (ICI) which degrades the performance. This becomes more severe as mobile speed, carrier frequency or OFDM symbol duration increases. As delay spread increases, symbol duration should also increase in order to maintain a near-constant channel in every frequency subband. Also, due to the high demand for bandwidth, there is a trend toward higher carrier frequencies. Therefore, to have an acceptable reception quality for the applications that experience high delay and Doppler spread, there is a need for ICI mitigation within one OFDM symbol. We introduce two new methods to mitigate ICI in an OFDM system with coherent channel estimation. Both methods use a piece-wise linear model to approximate channel time-variations. The first method extracts channel time-variations information from the cyclic prefix. The second method estimates these variations using the next symbol. We find a closed-form expression for the improvement in average signal-to-interference ratio (SIR) when our mitigation methods are applied for a narrowband time-variant channel. Finally, our simulation results show how these methods would improve the performance in a highly time-variant environment with high delay spread.