Indian Journal of Science and Technology
Year: 2016, Volume: 9, Issue: Special Issue 1, Pages: 1-6
B. Usha Rani* and K. Ramanjaneyulu
In general coherent detection, channel estimation requires huge number of symbols for transmission in Multiband Orthogonal Frequency Division Multiplexing (MB-OFDM) Ultra Wide Band (UWB) system, due to this bandwidth efficiency reduces. The proposed Differential Space-Time-Frequency Code (DSTFCs) for multiband-OFDM Ultra-WB communications is increases the efficiency of bandwidth. DSTFC system does not require Channel State Information (CSI). Due to this, the system bandwidth efficiency is possible to increase with DSTFCs. The proposed DSTFCs are derived both coding and decoding algorithms for 64 QAM (Quadrature Amplitude Modulation). The Simulation outcomes show that the use of DSTFCs can improve the coherent MB-OFDM (without STFC), differential MB-OFDM (without OFDM) bit error performance. The performance of DSTFCs almost reaches the STFCs performance even in the absence of channel state information
Keywords: CSI, DSTFC, OFDM, QAM, STFC, UWB
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