Differential Space-Time-Frequency Codes for MB-OFDM UWB with Dual Carrier Modulation

L. C. Tran, A. Mertins


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 associated with dual carrier modulation (DCM) can significantly improve the bit error performance of conventional differential MB-OFDM system (without MIMO), and even provide better bit error performance than the DSTFC MB-OFDM system associated with constant envelope modulation schemes.
Original languageEnglish
Title of host publication2009 IEEE International Conference on Communications
Number of pages5
Publication date01.06.2009
Article number5198916
ISBN (Electronic)978-1-4244-3435-0
Publication statusPublished - 01.06.2009
Event2009 IEEE International Conference on Communications - Dresden, Germany
Duration: 14.06.200918.06.2009
Conference number: 78026


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