This paper proposes a new method for constructing multidimensional signal constellations (SC), referred to as SCOPT, for high-speed communication systems with enhanced energy efficiency (EE). In contrast to conventional approaches, the proposed method increases the minimum Euclidean distance (MED) between signals by increasing the normalized signal duration, without relying on coding or increasing transmit power. Analytical expressions for the demodulation error probability and the energy loss relative to the Shannon limit are derived. It is shown that, unlike classical Shannon-type constellations (SCSH), SCOPT enable reliable communication regimes in which the required signal-to-noise ratio may fall below the conventional Shannon limit within the adopted geometric framework. The proposed constellations retain a simple structure compatible with standard modulation schemes such as QAM and APSK,making them suitable for practical implementation in modern communication systems. Numerical analysis demonstrates that SCOPT significantly outperform SCSH in terms of energy efficiency while requiring substantially shorter signal duration.

翻译：本文提出一种用于高速通信系统的新型多维信号星座（SC）构建方法，称为SCOPT，旨在提升能量效率（EE）。与传统方法不同，所提方案通过增加归一化信号持续时间来增大信号间最小欧氏距离（MED），无需依赖编码或增加发射功率。推导出解调错误概率及相对于香农极限的能量损耗解析表达式。研究表明，与经典香农型星座（SCSH）不同，SCOPT能够实现可靠通信模式，在此模式下所需信噪比可能低于传统几何框架下的香农极限。所提星座保留与QAM、APSK等标准调制方案兼容的简洁结构，适用于现代通信系统的实际部署。数值分析表明，SCOPT在能效方面显著优于SCSH，且所需信号持续时间大幅缩短。