Index Modulation With Channel Training: Spectral Efficiency and Optimal Antenna Alphabets
Index Modulation With Channel Training: Spectral Efficiency and Optimal Antenna Alphabets
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DOI：
10.1109/twc.2023.3296696
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发表时间：
2024-03
影响因子：
10.4
通讯作者：
Bharath Shamasundar;Aria Nosratinia
中科院分区：
文献类型：
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作者：
Bharath Shamasundar;Aria Nosratinia
索引调制是一种MIMO技术，其中一些发射天线在每个传输间隔期间是空闲的，但接收机需要始终知道所有链路增益。即使索引调制是特别敏感的估计信道状态信息（CSI）的成本，CSI成本和不完善的索引调制的容量的影响还没有得到充分的表征，直到现在。因此，每个额外天线的边际成本/效益以及最佳天线字母表仍然不清楚。本研究计算训练后的索引调变频谱效率，并决定最佳的天线字母。我们的方法涉及到一个全面的检查导频功率和自由度的影响，可实现的折射率调制。结果包括2.5dB的改善，在以前最好的已知的界限为4\times2 $空间调制在6 b/s/Hz。此外，我们确定的条件下，单天线传输是上级空间调制，反之亦然。此外，这种基于训练的频谱效率分析扩展到多用户上行链路，确定可以容纳的用户的数量，同时最大限度地提高上行链路的总速率下的空间调制。
Index modulation is a MIMO technology where some transmit antennas are idle during each transmission interval, but the receiver requires knowledge of all link gains at all times. Even though index modulation is particularly sensitive to the cost of estimating the channel state information (CSI), the impact of CSI cost and imperfections on the capacity of index modulation has not been adequately characterized until now. As a result, the marginal cost/benefit of each additional antenna, and the optimal antenna alphabet have remained unclear. This study computes the spectral efficiency of index modulation subject to training and determines optimal antenna alphabets. Our approach involves a comprehensive examination of the influence of pilot power and degrees of freedom on the achievable rate of index modulation. The results include 2.5dB improvement over the best previously known bound for $4\times2$ spatial modulation at 6b/s/Hz. Additionally, we determine the conditions under which single-antenna transmission is superior to spatial modulation, and vice versa. Moreover, this training-based spectral efficiency analysis is extended to the multiuser uplink, identifying the number of users that can be accommodated while maximizing the uplink sum-rate under spatial modulation.