An introduction to signal detection and estimation (2nd ed.)
An introduction to signal detection and estimation (2nd ed.)
Matrix computations (3rd ed.)
Microwave Mobile Communications
Microwave Mobile Communications
On Limits of Wireless Communications in a Fading Environment when UsingMultiple Antennas
Wireless Personal Communications: An International Journal
EURASIP Journal on Applied Signal Processing
Low-complexity banded equalizers for OFDM systems in Doppler spread channels
EURASIP Journal on Applied Signal Processing
Efficient sequence detection of multicarrier transmissions over doubly dispersive channels
EURASIP Journal on Applied Signal Processing
A Gibbs sampling based MAP detection algorithm for OFDM over rapidly varying mobile radio channels
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Intercarrier interference in MIMO OFDM
IEEE Transactions on Signal Processing
A comparison of pilot-aided channel estimation methods for OFDMsystems
IEEE Transactions on Signal Processing
Low-complexity equalization of OFDM in doubly selective channels
IEEE Transactions on Signal Processing
Equalization for OFDM over doubly selective channels
IEEE Transactions on Signal Processing
Iterative interference cancellation and channel estimation for mobile OFDM
IEEE Transactions on Wireless Communications
MMSE and adaptive prediction of time-varying channels for OFDM systems
IEEE Transactions on Wireless Communications
ICI mitigation for pilot-aided OFDM mobile systems
IEEE Transactions on Wireless Communications
Iterative joint time-variant channel estimation and multi-user detection for MC-CDMA
IEEE Transactions on Wireless Communications
Iterative Channel Estimation and Decoding of Turbo Coded SFBC-OFDM Systems
IEEE Transactions on Wireless Communications
Blind multiuser detection: a subspace approach
IEEE Transactions on Information Theory
Channel estimation for OFDM with fast fading channels by modified Kalman filter
IEEE Transactions on Consumer Electronics
Iterative Estimation and Equalization for SCCP Over Doubly Selective Channels
Wireless Personal Communications: An International Journal
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This paper is concerned with the challenging and timely problem of joint channel estimation, equalization, and data detection for uplink orthogonal frequency division multiplexing (OFDM) systems in the presence of frequency selective and very rapidly time varying channels. The resulting algorithm is based on the space alternating generalized expectation maximization (SAGE) technique which is particularly well suited to multicarrier signal formats leading to a receiver structure that also incorporates interchannel interference (ICI) cancelation. In order to reduce the computational complexity of the algorithm, band-limited, discrete cosine orthogonal basis functions are employed to represent the rapidly time-varying fading channel by the discrete cosine serial expansion coefficients. It is shown that, depending on the normalized Doppler frequency, only a small number of expansion coefficients is sufficient to approximate the channel perfectly and there is no need to know the correlation function of the input signal. In this way, the resulting reduced dimensional channel coefficients are estimated and the data symbols detected iteratively with tractable complexity. The proposed SAGE joint detection algorithm updates the data sequences serially and the channel parameters are updated in parallel, leading to a receiver structure that also incorporates ICI cancelation. Computer simulations show that the cosine transformation represents the time-varying channel very effectively and the proposed algorithm has excellent symbol error rate and channel estimation performance even with a very small number of channel expansion coefficients employed in the algorithm, resulting in substantial reduction of the computational complexity.