索引调制下的通信与计算一体化
Integrated Communication and Computing with Index Modulation
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中文总结 AI 辅助
提出一种利用索引调制中未激活天线进行空中计算的通信计算一体化架构，实现同时传输与计算，并通过VGaBP检测器在接近最优性能下平衡调制鲁棒性与计算精度。
中文摘要 AI 辅助
我们提出了一种集成通信与计算（ICC）架构，该架构将空间索引调制（IM）发射机中未激活的天线重新用于执行空中计算（AirComp）。虽然IM通过选择性地激活一部分发射天线实现了出色的频谱效率，但未使用的天线在传统上被完全停用，从而放弃了无需额外带宽即可利用的空间自由度（DoF）。通过在这些空闲天线上传输预均衡的低功率计算流，所提出的架构实现了同时进行数据传输和计算，而无需正交的频率或时间资源。对齐完全在发射机处进行，使得预均衡利用本地信道状态信息（CSI）完成，而在接收机处，矢量高斯置信传播（VGaBP）检测器在离散IM码本约束下恢复数据负载，然后从残差中估计目标函数。与精确最大似然（ML）基线相比的数值结果证实了在所采用的统计模型下接近最优的检测性能，并揭示了分配给数据传输的天线数量直接决定了调制鲁棒性与AirComp精度之间的权衡。
英文摘要
We propose an integrated communication and computing (ICC) architecture that repurposes the inactive antennas of a spatial index modulation (IM) transmitter to perform over-the-air computation (AirComp). While IM delivers excellent spectral efficiency by selectively activating a subset of transmit antennas, the unused antennas are conventionally completely deactivated, forgoing spatial degrees of freedom (DoF) that can be exploited without additional bandwidth. By instead transmitting a pre-equalized, low-power computing stream over these idle antennas, the proposed architecture achieves simultaneous data transmission and computation without requiring orthogonal frequency or time resources. Alignment is performed entirely at the transmitters, such that the pre-equalization occurs leveraging local channel state information (CSI), while at the receiver, a vector Gaussian belief propagation (VGaBP) detector recovers the data payload under the discrete IM codebook constraint before the target function is estimated from the residual. Numerical results against exact maximum likelihood (ML) baselines confirm near-optimal detection under the adopted statistical model, and reveal that the number of antennas assigned to data transmission governs a direct trade-off between modulation robustness and AirComp accuracy.
发表机构
- School of Computer Science and Engineering, Constructor University（康斯特大学计算机科学与工程学）
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