Efficient sequence detection of multicarrier transmissions over doubly dispersive channels
EURASIP Journal on Applied Signal Processing
Finite Parameter Model for Doubly-Selective Channel Estimation in OFDM
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
EURASIP Journal on Wireless Communications and Networking - Special issue on OFDMA architectures, protocols, and applications
IEEE Transactions on Signal Processing
Blind channel estimation in orthogonally coded MIMO-OFDM systems: a semidefinite relaxation approach
IEEE Transactions on Signal Processing
IEEE Transactions on Wireless Communications
IEEE Transactions on Wireless Communications
Optimized training and basis expansion model parameters for doubly-selective channel estimation
IEEE Transactions on Wireless Communications
Chirp channel estimation and OFDM transmission using discrete prolate spheroidal sequences
SPPRA '08 Proceedings of the Fifth IASTED International Conference on Signal Processing, Pattern Recognition and Applications
Computationally efficient MIMO HSDPA system-level modeling
EURASIP Journal on Wireless Communications and Networking - Special issue on broadband wireless access
Linearly time-varying channel estimation for MIMO/OFDM systems using superimposed training
IEEE Transactions on Communications
Doubly selective channel estimation using exponential basis models and subblock tracking
IEEE Transactions on Signal Processing
Space-time block coding for doubly-selective channels
IEEE Transactions on Signal Processing
Slepian-based serial estimation of time-frequency variant channels for MIMO-OFDM systems
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Block detection of multiple symbol DPSK in a statistically unknown time-varying channel
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Channel estimation in wireless OFDM systems with irregular pilot distribution
IEEE Transactions on Signal Processing
On the estimation of doubly-selective fading channels
IEEE Transactions on Wireless Communications
IEEE Transactions on Wireless Communications
Noncoherent capacity of underspread fading channels
IEEE Transactions on Information Theory
IEEE Transactions on Wireless Communications
A channel-based hypothesis testing approach to enhance user authentication in wireless networks
COMSNETS'10 Proceedings of the 2nd international conference on COMmunication systems and NETworks
A novel BEM- based channel estimation algorithm for time variant uplink OFDMA system
ICACT'10 Proceedings of the 12th international conference on Advanced communication technology
Space-time block coding for frequency-selective and time-varying channels
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
Forgetting factor selection in RLS decision-directed tracking of doubly-selective channels
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
Robustness of joint Bayesian frequency offset and channel estimation based on basis expansion models
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
On channel-based user authentication for mobile terminals
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
Robust precoding with Bayesian error modeling for limited feedback MU-MISO systems
IEEE Transactions on Signal Processing
Low complexity equalization for doubly selective channels modeled by a basis expansion
IEEE Transactions on Signal Processing
Maximum-likelihood semiblind equalization of doubly selective channels using the EM algorithm
EURASIP Journal on Advances in Signal Processing - Special issue on advanced equalization techniques for wireless communications
The impact of time varying channels on MAC layer in IEEE 802.11 networks
CIT'11 Proceedings of the 5th WSEAS international conference on Communications and information technology
Wireless Personal Communications: An International Journal
Wireless Personal Communications: An International Journal
Iterative Decomposed OFDM Channel Estimation Algorithm Over Highly Mobile Channels
Wireless Personal Communications: An International Journal
Iterative estimation of the time-varying underwater acoustic channel using basis expansion models
Proceedings of the Eighth ACM International Conference on Underwater Networks and Systems
| Hi-index | 35.77 |
We propose and analyze a low-complexity channel estimator for a multiuser multicarrier code division multiple access (MC-CDMA) downlink in a time-variant frequency-selective channel. MC-CDMA is based on orthogonal frequency division multiplexing (OFDM). The time-variant channel is estimated individually for every flat-fading subcarrier, assuming small intercarrier interference. The temporal variation of every subcarrier over the duration of a data block is upper bounded by the Doppler bandwidth determined by the maximum velocity of the users. Slepian showed that time-limited snapshots of bandlimited sequences span a low-dimensional subspace. This subspace is also spanned by discrete prolate spheroidal (DPS) sequences. We expand the time-variant subcarrier coefficients in terms of orthogonal DPS sequences we call Slepian basis expansion. This enables a time-variant channel description that avoids the frequency leakage effect of the Fourier basis expansion. The square bias of the Slepian basis expansion per subcarrier is three magnitudes smaller than the square bias of the Fourier basis expansion. We show simulation results for a fully loaded MC-CDMA downlink with classic linear minimum mean square error multiuser detection. The users are moving with 19.4 m/s. Using the Slepian basis expansion channel estimator and a pilot ratio of only 2%, we achieve a bit error rate performance as with perfect channel knowledge.