Performance of Space-Time Block Coded MB-OFDM UWB Systems
CNSR '06 Proceedings of the 4th Annual Communication Networks and Services Research Conference
Complex Orthogonal Space-Time Processing in Wireless Communications
Complex Orthogonal Space-Time Processing in Wireless Communications
IEEE Transactions on Wireless Communications
Multiband-OFDM MIMO coding framework for UWB communication systems
IEEE Transactions on Signal Processing
Single-block differential transmit scheme for broadband wireless MIMO-OFDM systems
IEEE Transactions on Signal Processing
Block differentially encoded OFDM with maximum multipath diversity
IEEE Transactions on Wireless Communications
Differential space-time-frequency coded OFDM with maximum multipath diversity
IEEE Transactions on Wireless Communications
Bandwidth Efficient Channel Estimation Using Super-Imposed Pilots in OFDM Systems
IEEE Transactions on Wireless Communications
Space-time block codes from orthogonal designs
IEEE Transactions on Information Theory
A simple transmit diversity technique for wireless communications
IEEE Journal on Selected Areas in Communications
Quasi-orthogonal space-time-frequency codes in MB-OFDM UWB
Computers and Electrical Engineering
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In a multiple-input multiple-output (MIMO) multiband orthogonal frequency division multiplexing (MB-OFDM) ultra-wideband (UWB) system, coherent detection where the channel state information (CSI) is assumed to be exactly known at the receiver requires the transmission of a large number of symbols for channel estimation, thus reducing the bandwidth efficiency. This paper examines the use of unitary differential space-time frequency codes (DSTFCs) in MB-OFDM UWB, which increases the system bandwidth efficiency due to the fact that no CSI is required for differential detection. The proposed DSTFC MB-OFDM system would be useful when the transmission of multiple channel estimation symbols is impractical or uneconomical. Simulation results show that the application of DSTFCs can significantly improve the bit error performance of conventional differential MB-OFDM system (without MIMO).