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| A Novel Differential Unitary Space-Time Modulation Scheme in Fast Fading Channel |
| Lü Shu-juan; Wei Guo; Zhu Jin-kang; Du Zheng |
| PCN&SS Lab, University of Science and Technology of China, Hefei 230027, China |
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Abstract A new differential unitary space-time modulation scheme based on cyclic unitary group code is proposed for systems with multiple transmit antennas in fast fading channels. By exchanging the sequence of transmitted symbols, this new differential unitary space-time modulation scheme reduces the influence from time-variance of fast fading channels at the cost of larger processing delay and additional transmission power. For larger processing delay, the additional transmission power is negligible. Theoretical analysis and Monte Carlo simulations using matlab are carried out to investigate the performance of the conventional and the proposed differential unitary space-time modulation schemes. It is demonstrated that this new differential unitary space-time modulation scheme can achieve significant gains compared with the conventional differential unitary space-time modulation in fast fading channels with very little cost.
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Received: 26 April 2004
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2005, Vol. 27 
