The concept of reconfigurable intelligent surface (RIS)-assisted transmission, where phases of reflected signals are adjusted in an effective arrangement, has been recently put forward as a promising solution for 6G and beyond networks. Considering this and the undeniable potential of index modulation (IM) techniques, an RIS-based space shift keying (SSK) scheme is proposed in this letter to maintain all inherent advantages of both RISs and SSK. Specifically, a mathematical framework is presented by using a maximum likelihood (ML) detector for the calculation of the average bit error rate (ABER). Extensive computer simulation results are provided to assess the potential of the proposed RIS-based SSK system and to verify the theoretical derivations. The obtained results indicate that the proposed scheme enables highly reliable transmission with unconventionally high energy efficiency, however with the added cost of increased receiver complexity.

中文翻译：

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可重构智能表面辅助空间移位键控

可重构智能表面 (RIS) 辅助传输的概念，其中反射信号的相位以有效排列进行调整，最近被提出作为 6G 及以后网络的有前途的解决方案。考虑到这一点以及索引调制 (IM) 技术不可否认的潜力，本文提出了一种基于 RIS 的空间移位键控 (SSK) 方案，以保持 RIS 和 SSK 的所有固有优势。具体而言，通过使用最大似然 (ML) 检测器来计算平均误码率 (ABER) 来提出数学框架。提供了广泛的计算机模拟结果来评估所提出的基于 RIS 的 SSK 系统的潜力并验证理论推导。