Spatial Modulation vs. Single-Antenna Transmission: When is Indexing Helpful?
Spatial Modulation vs. Single-Antenna Transmission: When is Indexing Helpful?
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DOI：
10.1109/isit54713.2023.10206660
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发表时间：
2023-06
期刊：
影响因子：
--
通讯作者：
Bharath Shamasundar;Aria Nosratinia
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文献类型：
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作者：
Bharath Shamasundar;Aria Nosratinia
在空间调制中，即使在每个传输间隔中只有一个天线是活动的，接收机也需要在所有时间相对于所有发射天线的信道估计。因此，与传统的单天线传输相比，空间调制对信道状态信息（CSI）的估计的成本更敏感。尽管它的重要性，一个准确的，联合表征的CSI成本和CSI不完善的空间调制的容量的影响，迄今为止一直不可用。因此，每个附加天线的边际成本/效益以及最佳天线字母表一直不清楚。这项工作计算的频谱效率的空间调制的训练通过一个严格的表征的可实现的速率上的功率和自由度专用于导频的依赖。我们的研究结果可靠地表征的情况下，当传统的单天线传输是上级空间调制或反之亦然。
In spatial modulation, even though only one antenna is active in each transmission interval, the receiver needs channel estimates with respect to all transmit antennas at all times. Thus, spatial modulation is more sensitive to the cost of the estimation of channel state information (CSI) compared with conventional single-antenna transmission. Despite its importance, an accurate, joint characterization of the impact of CSI cost and CSI imperfections on the capacity of spatial modulation has been unavailable thus far. As a result, the marginal cost/benefit of each additional antenna, and hence the optimal antenna alphabet, has been unclear. This work calculates the spectral efficiency of spatial modulation subject to training through a tight characterization of the dependence of the achievable rate on the power and degrees of freedom dedicated to pilots. Our results reliably characterize the cases when conventional single-antenna transmission is superior to spatial modulation or vice versa.