一種新的快衰落信道下的差分Unitary時空編碼調(diào)制方法
A Novel Differential Unitary Space-Time Modulation Scheme in Fast Fading Channel
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摘要: 該文提出了一種新的基于循環(huán)對角群碼的差分Unitary 時空編碼調(diào)制方法，這種新方法通過改變發(fā)送符號的順序來降低快衰落信道時變對解碼造成的影響，從而提高在快衰落信道下的性能。這種性能的提高是以處理時延和額外能量開銷的增加為代價的，在實際應(yīng)用中需要在這兩者之間尋求平衡，處理時延越大，額外的能量開銷就越小，反之亦然。 與傳統(tǒng)的差分Unitary時空編碼調(diào)制方法比較，理論分析和matlab做的Monte Carlo仿真結(jié)果表明，在快衰落信道下，提出的差分Unitary時空編碼調(diào)制方法可獲得明顯的性能增益，能夠顯著降低系統(tǒng)的成對差錯概率和誤比特率。
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關(guān)鍵詞:
- 無線通信;時空碼;差分;Unitary時空編碼調(diào)制
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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