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Bandwidth-efficient linear Modulations for multiple-antenna transmission

机译:用于多天线传输的带宽有效的线性调制

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摘要

Some M/spl times/T modulation matrices for M transmit antennas and T symbol periods, with M=2,3,4 and T=2, and M=T=4 are studied. A transmission rate of M symbols per channel use and a transmit diversity order of min(M,T) are achieved over a quasi-static fading channel when using rotated versions of a multidimensional quadratic amplitude modulation with spectral efficiency 2 bits/symbol. Extension to input constellations with higher spectral efficiencies is then considered. The modulations are then generalized to any number of transmit antennas M and any number of symbol periods T, such that a transmission rate of M symbols per channel use, and a transmit diversity of T are achieved under fast fading (ergodic scenario). By means of signal space diversity, the proposed modulations exploit the degrees of freedom of multiantenna channels and have moderate detection complexity at moderate and large signal-to-noise ratios (SNRs).
机译:研究了M个发射天线和T个符号周期的M / spl次/ T调制矩阵,其中M = 2,3,4和T = 2,M = T = 4。当使用频谱效率为2位/符号的多维二次振幅调制的旋转版本时,在准静态衰落信道上可以实现每信道使用M个符号的传输速率和min(M,T)的传输分集阶数。然后考虑扩展到具有更高频谱效率的输入星座图。然后将调制一般化为任意数量的发射天线M和任意数量的符号周期T,以便在快速衰落(遍历场景)下实现每信道使用M个符号的传输速率和T的发射分集。通过信号空间分集,所提出的调制利用了多天线信道的自由度,并且在中等和较大的信噪比(SNR)下具有中等的检测复杂度。

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