Time-domain and frequency-domain per-tone equalization for OFDM over doubly selective channels
Signal Processing - Signal processing in communications
Joint Time-Domain Tracking of Channel and Frequency Offsets for MIMO OFDM Systems
Wireless Personal Communications: An International Journal
Joint MIMO-OFDM and MAC design for broadband multihop ad hoc networks
EURASIP Journal on Wireless Communications and Networking
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 Novel Technique for Channel Estimation and Equalization for High Mobility OFDM Systems
Wireless Personal Communications: An International Journal
On channel estimation in fast fading mobile coded MIMO OFDM
ISIT'09 Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 2
EURASIP Journal on Wireless Communications and Networking
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
Channel estimation for OFDM system with two training symbols aided and polynomial fitting
IEEE Transactions on Communications
IEEE Transactions on Signal Processing
A model reduction approach for OFDM channel estimation under high mobility conditions
IEEE Transactions on Signal Processing
New OFDM channel estimation with dual-ICI cancellation in highly mobile channel
IEEE Transactions on Wireless Communications
Time-varying FIR equalization for MIMO transmission over doubly selective channels
EURASIP Journal on Advances in Signal Processing - Special issue on advanced equalization techniques for wireless communications
Wireless Personal Communications: An International Journal
An Effective Method to Reduce Sensibility to CFO in OFDM
Wireless Personal Communications: An International Journal
EURASIP Journal on Wireless Communications and Networking
Wireless Personal Communications: An International Journal
Wireless Personal Communications: An International Journal
Statistical Transceiver Designs with ICI Reduction for MIMO-OFDM Systems
Wireless Personal Communications: An International Journal
| Hi-index | 35.69 |
In this paper, we examine multicarrier transmission over time-varying channels. We first develop a model for such a transmission scheme and focus particularly on multiple-input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM). Using this method, we analyze the impact of time variation within a transmission block (time variation could arise both from Doppler spread of the channel and from synchronization errors). To mitigate the effects of such time variations, we propose a time-domain approach. We design ICI-mitigating block linear filters, and we examine how they are modified in the context of space-time block-coded transmissions. Our approach reduces to the familiar single-tap frequency-domain equalizer when the channel is block time invariant. Channel estimation in rapidly time-varying scenarios becomes critical, and we propose a scheme for estimating channel parameters varying within a transmission block. Along with the channel estimation scheme, we also examine the issue of pilot tone placement and show that in time-varying channels, it may be better to group pilot tones together into clumps that are equispaced onto the FFT grid; this placement technique is in contrast to the common wisdom for time-invariant channels. Finally, we provide numerical results illustrating the performance of these schemes, both for uncoded and space-time block-coded systems.