Joint Time-Domain Tracking of Channel and Frequency Offsets for MIMO OFDM Systems
Wireless Personal Communications: An International Journal
A pilot-based fast algorithm for joint estimation of frequency offset and channel in OFDM
Signal Processing - Fractional calculus applications in signals and systems
Blind identification of FIR channels in the presence of unknown noise
EURASIP Journal on Applied Signal Processing
Constrained optimization of MIMO training sequences
EURASIP Journal on Applied Signal Processing
Multi-carrier transmission techniques for wireless communication systems: a survey
WSEAS TRANSACTIONS on COMMUNICATIONS
EURASIP Journal on Wireless Communications and Networking - Special issue on OFDMA architectures, protocols, and applications
Performance bounds for MIMO-OFDM channel estimation
IEEE Transactions on Signal Processing
Pilot design for MIMO OFDM systems with virtual carriers
IEEE Transactions on Signal Processing
A signal perturbation free whitening-rotation-based semiblind approach for MIMO channel estimation
IEEE Transactions on Signal Processing
Sequential estimation of multipath MIMO-OFDM channels
IEEE Transactions on Signal Processing
Blind channel estimation in orthogonally coded MIMO-OFDM systems: a semidefinite relaxation approach
IEEE Transactions on Signal Processing
Low complexity pilot aided frequency synchronization for OFDMA uplink transmission
IEEE Transactions on Wireless Communications
Channel re-estimation in OFDM systems with constellation rotation
RWS'09 Proceedings of the 4th international conference on Radio and wireless symposium
3D pilot aided channel estimation
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
Pilot designs for channel estimation of OFDM systems with frequency-dependent I/Q imbalances
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
EURASIP Journal on Wireless Communications and Networking - Special issue on synchronization in wireless communications
Channel estimation for OFDM modulated two-way relay networks
IEEE Transactions on Signal Processing
A forward-backward Kalman filter-based STBC MIMO OFDM receiver
EURASIP Journal on Advances in Signal Processing
Recursive MMSE channel estimation for MIMO-OFDM systems
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
On using transmission overhead efficiently for channel estimation in OFDM
IEEE Transactions on Communications
Linearly time-varying channel estimation for MIMO/OFDM systems using superimposed training
IEEE Transactions on Communications
Temporal synchronization of MIMO wireless communication in the presence of interference
IEEE Transactions on Signal Processing
A restricted isometry property for structurally-subsampled unitary matrice
Allerton'09 Proceedings of the 47th annual Allerton conference on Communication, control, and computing
Effect of I/Q imbalance on pilot design for MIMO OFDM channel estimation
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
An oversampling approach for LoS-ToA estimation in interleaved OFDMA
Proceedings of the 6th International Wireless Communications and Mobile Computing Conference
Effect of imperfect channel estimation in I/Q imbalanced OFDM system
Proceedings of the 6th International Wireless Communications and Mobile Computing Conference
Low-complexity equalization of rapidly time-varying multi-path channels for OFDM systems
ICICS'09 Proceedings of the 7th international conference on Information, communications and signal processing
Preamble-based channel estimation for CP-OFDM and OFDM/OQAM systems: a comparative study
IEEE Transactions on Signal Processing
Joint estimation of I/Q imbalance, CFO and channel response for MIMO OFDM systems
IEEE Transactions on Communications
Contrabass: concurrent transmissions without coordination
Proceedings of the ACM SIGCOMM 2010 conference
Pilot designs for channel estimation of MIMO OFDM systems with frequency-dependent I/Q imbalances
IEEE Transactions on Communications
A signal-perturbation-free transmit scheme for MIMO-OFDM channel estimation
IEEE Transactions on Circuits and Systems Part I: Regular Papers
Optimized training sequences for spatially correlated MIMO-OFDM
IEEE Transactions on Wireless Communications
IEEE Transactions on Communications
Adaptive channel estimation for STBC-OFDM systems based on nature-inspired optimization strategies
MACOM'10 Proceedings of the Third international conference on Multiple access communications
Semi-blind most significant tap detection for sparse channel estimation of OFDM systems
IEEE Transactions on Circuits and Systems Part I: Regular Papers
Optimal superimposed training sequences for channel estimation in MIMO-OFDM systems
EURASIP Journal on Advances in Signal Processing
Effects of channel estimation on multiuser virtual MIMO-OFDMA relay-based networks
EURASIP Journal on Wireless Communications and Networking
Adaptive Channel Estimation for Multiple Antenna OFDM Systems
Wireless Personal Communications: An International Journal
Simplified Semi-Blind Channel Estimation for Space---Time Coded MIMO-OFDM Systems
Wireless Personal Communications: An International Journal
Full length article: Optimally balancing data and pilot power for adaptive MIMO-OFDM systems
Physical Communication
Wireless Personal Communications: An International Journal
Channel estimation based on neural network in space time block coded MIMO-OFDM system
Digital Signal Processing
Wireless Personal Communications: An International Journal
Pilot Tones Optimization Using Artificial Bee Colony Algorithm for MIMO---OFDM Systems
Wireless Personal Communications: An International Journal
Detection of sparse targets with structurally perturbed echo dictionaries
Digital Signal Processing
Hi-index | 35.71 |
This paper describes a least squares (LS) channel estimation scheme for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems based on pilot tones. We first compute the mean square error (MSE) of the LS channel estimate. We then derive optimal pilot sequences and optimal placement of the pilot tones with respect to this MSE. It is shown that the optimal pilot sequences are equipowered, equispaced, and phase shift orthogonal. To reduce the training overhead, an LS channel estimation scheme over multiple OFDM symbols is also discussed. Moreover, to enhance channel estimation, a recursive LS (RLS) algorithm is proposed, for which we derive the optimal forgetting or tracking factor. This factor is found to be a function of both the noise variance and the channel Doppler spread. Through simulations, it is shown that the optimal pilot sequences derived in this paper outperform both the orthogonal and random pilot sequences. It is also shown that a considerable gain in signal-to-noise ratio (SNR) can be obtained by using the RLS algorithm, especially in slowly time-varying channels.