On the Capacity of Index Modulation
On the Capacity of Index Modulation
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DOI：
10.1109/twc.2022.3173207
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发表时间：
2022-11
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
索引调制表示分为两个部分的传输信息：通过选择可用传输尺寸的子集（天线，子载波或时间段），其选择索引带有信息，并通过调制符号在选定的维度中传输。索引调制是通过降低发射机硬件复杂性来进行的，并在过去十年中引起了大量的研究关注。实际上，了解光谱效率或能力对于设置调制和编码索引调制的参数至关重要，但是到目前为止，近似值和边界对于此目的而言还不够准确。我们计算索引调制的光谱效率的近下和上限。当接收天线的数量大于或等于发射天线的数量时，我们的上限和上限会在高SNR处相遇，因此在这些情况下，指数调制的高SNR能力已充分表征。为空间调制，广义空间调制，时间和频率指数调制提供了结果目录。广泛的模拟说明了我们结果的有用性和准确性。例如，对于以8位/s/hz为$ 4 \ times 2 $天线的空间调制，我们的结果比文献中最佳可用界限更紧。
Index modulation represents the transmitted information in two parts: by selecting a subset of available transmission dimensions (antennas, sub-carriers, or time-slots) whose selection index carries information, and by modulation symbols transmitted in the selected dimensions. Index modulation is motivated by reducing the transmitter hardware complexity and has attracted significant research attention in the past decade. In practice, knowing the spectral efficiency or capacity is essential for setting the parameters of modulation and coding for index modulation, but approximations and bounds thus far have not been accurate enough for that purpose. We calculate close lower and upper bounds for the spectral efficiency of index modulation. Our lower and upper bounds meet at high-SNR when the number of receive antennas is greater than or equal to the number of transmit antennas, thus the high-SNR capacity of index modulation in these cases has been fully characterized. A catalog of results is provided for spatial modulation, generalized spatial modulation, time and frequency index modulation. Extensive simulations illustrate the usefulness and accuracy of our results. For example, for spatial modulation with $4\times 2$ antennas at 8 bits/s/Hz, our results are 2dB tighter than the best available bounds in the literature.