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Journal of the Korean Institute of Electromagnetic and Science 2006;6(4):209-216.
Differential Space Time Coding based on Different Unitary Matrices Sets
Kwang-Jae Lee1, Chang-Joo Kim2, Hyun-Seok Yoo3, Sung-Hun Kim3, Moon-Ho Lee3
1Dept. of Multimedia, Information and Telecommunication, Hanlyo University
2Electronics and Telecommunication Research Institute(ETRI)
3Dept. of Information and Communication, Chonbuk National University
Abstract
This paper investigates a distinct set of complex unitary matrices for QPSK differential space time coding. After properly selecting the initial transmission matrix and unitary matrices we find that the different combinations of them could lead different BER performance over slow/fast Rayleigh fading channels and antennas correlated channels. The numerical results show that the proper selection of the initial transmission matrix and the set of unitary matrices can efficiently improve the bit error rate performance, especially for the antennas correlated fading channel. The computer simulations are evaluated over slow and fast Rayleigh fading channels.
Key words: Space Time Coding, Unitary Matrices, QPSK, Rayleigh Fading
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