Proceedings of the 2006 international conference on Wireless communications and mobile computing
Adaptive selection of MIMO schemes in IEEE 802.16e
IWCMC '07 Proceedings of the 2007 international conference on Wireless communications and mobile computing
Efficient closed-loop schemes for MIMO-OFDM-based WLANs
EURASIP Journal on Applied Signal Processing
EURASIP Journal on Wireless Communications and Networking
Cross-layer adaptive modulation and coding design for space-time block coded MIMO-OFDM systems
Computer Communications
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Optimal resource allocation in the OFDMA downlink with imperfect channel knowledge
IEEE Transactions on Communications
A subcarrier, bit, and power allocation scheme for MIMO OFDM-based multiuser communication systems
AsiaCSN '07 Proceedings of the Fourth IASTED Asian Conference on Communication Systems and Networks
On spectral efficiency of low-complexity adaptive MIMO systems in rayleigh fading channel
IEEE Transactions on Wireless Communications
Robust transmit processing for BICM-OFDM systems
IEEE Transactions on Wireless Communications
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Simplified maximum-likelihood precoder selection for limited feedback spatial multiplexing systems
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Robust cyclic space-frequency filtering for BICM-OFDM with outdated CSIT
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Max-matching diversity in OFDMA systems
IEEE Transactions on Communications
Cooperative ARQ via auction-based spectrum leasing
IEEE Transactions on Communications
Throughput evaluation for MIMO systems with partial CSIT and adaptive packet length
ICCOM'10 Proceedings of the 14th WSEAS international conference on Communications
Optimizing average performance of OFDM systems using limited-rate feedback
IEEE Transactions on Wireless Communications
Resource allocation in MU-OFDM cognitive radio systems with partial channel state information
EURASIP Journal on Wireless Communications and Networking
Scheduling in Wireless Networks
Foundations and Trends® in Networking
| Hi-index | 35.68 |
Relative to designs assuming no channel knowledge at the transmitter, considerably improved communications become possible when adapting the transmitter to the intended propagation channel. As perfect knowledge is rarely available, transmitter designs based on partial (statistical) channel state information (CSI) are of paramount importance not only because they are more practical but also because they encompass the perfect- and no-knowledge paradigms. In this paper, we first provide a partial CSI model for orthogonal frequency division multiplexed (OFDM) transmissions over multi-input multi-output (MIMO) frequency-selective fading channels. We then develop an adaptive MIMO-OFDM transmitter by applying an adaptive two-dimensional (2-D) coder-beamformer we derived recently on each OFDM subcarrier, along with an adaptive power and bit loading scheme across OFDM subcarriers. Relying on the available partial CSI at the transmitter, our objective is to maximize the transmission rate, while guaranteeing a prescribed error performance, under the constraint of fixed transmit-power. Numerical results confirm that the adaptive 2-D space-time coder-beamformer (with two basis beams as the two "strongest" eigenvectors of the channel's correlation matrix perceived at the transmitter) combined with adaptive OFDM (power and bit loaded with M-ary quadrature amplitude modulated (QAM) constellations) improves the transmission rate considerably.