一种新的快衰落信道下的差分Unitary时空编码调制方法
A Novel Differential Unitary Space-Time Modulation Scheme in Fast Fading Channel
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摘要: 该文提出了一种新的基于循环对角群码的差分Unitary 时空编码调制方法，这种新方法通过改变发送符号的顺序来降低快衰落信道时变对解码造成的影响，从而提高在快衰落信道下的性能。这种性能的提高是以处理时延和额外能量开销的增加为代价的，在实际应用中需要在这两者之间寻求平衡，处理时延越大，额外的能量开销就越小，反之亦然。 与传统的差分Unitary时空编码调制方法比较，理论分析和matlab做的Monte Carlo仿真结果表明，在快衰落信道下，提出的差分Unitary时空编码调制方法可获得明显的性能增益，能够显著降低系统的成对差错概率和误比特率。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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