arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2605.04545cs.ITeess.SPmath.IT
收藏

Z-Opt:一种近最优的低复杂度二维格拉斯曼星座

Z-Opt: A Near-Optimal Reduced-Complexity Two-Dimensional Grassmannian Constellation

Graduate School of Engineering Science, Yokohama National University(横滨国立大学大学院工学研究科);Ericsson Research, Ericsson Japan K. K.(爱立信日本株式会社爱立信研究院)

Kotaro Shigenaga, Hiroki Iimori, Yuto Hama, Chandan Pradhan, Szabolcs Malomsoky, Naoki Ishikawa

AI总结:

针对高信噪比下瑞利衰落信道非相干通信的格拉斯曼星座高效构建难题,提出S-Opt与Z-Opt两种低复杂度二维格拉斯曼星座构建方法及对应检测器,性能与GLRT检测器相当且复杂度更低。

摘要:

格拉斯曼星座在高信噪比下可达到瑞利衰落信道非相干通信的容量,但其高效构建仍具挑战性。本文针对G(2,1)上的格拉斯曼星座提出两种构建方法,分别命名为S-Opt和Z-Opt,并设计两种低复杂度检测器。构建与检测均在单位球(量子计算中称为布洛赫球)上进行。利用格拉斯曼流形上的弦距离与布洛赫球上的欧氏距离的比例关系,从Fejes-Toth界推导得到最小弦距离的理论上界。S-Opt星座由球填充解构建,达到对应最优布洛赫球填充的理论极限。S-Opt检测器适用于G(2,1)上的任意星座,所需复乘次数随接收天线数线性缩放、随星座大小对数缩放,数值比较次数随星座大小对数缩放,性能与GLRT检测器相当。基于S-Opt构建的思路,进一步提出Z-Opt星座,通过在布洛赫球上堆叠正多边形构建,在评估的星座大小范围内,其最小弦距离接近推导得到的上界。Z-Opt检测器所需复乘次数随接收天线数线性缩放,数值比较次数随星座大小的平方根对数缩放,针对Z-Opt星座的性能与GLRT检测器相当。

英文摘要:

Grassmannian constellations achieve the capacity of noncoherent communications over Rayleigh fading channels at high SNR, yet their efficient construction remains challenging. In this paper, we present two construction methods for Grassmannian constellations on G(2,1), termed S-Opt and Z-Opt, and propose two low-complexity detectors. Both construction and detection are performed on the unit sphere, known as the Bloch sphere in quantum computing. Exploiting the proportionality between the chordal distance on the Grassmann manifold and the Euclidean distance on the Bloch sphere, we derive a theoretical upper bound on the minimum chordal distance from the Fejes-Toth bound. The S-Opt constellation is constructed from sphere-packing solutions and achieves the theoretical limit corresponding to the considered optimal Bloch-sphere packings. The S-Opt detector applies to arbitrary constellations on G(2,1) and requires a number of complex multiplications scaling linearly with the number of receive antennas and logarithmically with the constellation size, and a number of numerical comparisons scaling logarithmically with the constellation size, while achieving the same performance as the GLRT detector. Based on the insight from the S-Opt construction, we further propose the Z-Opt constellation, constructed by stacking regular polygons on the Bloch sphere, whose minimum chordal distance approaches the derived upper bound over the evaluated constellation sizes. The Z-Opt detector requires a number of complex multiplications scaling linearly with the number of receive antennas and a number of numerical comparisons scaling logarithmically with the square root of the constellation size, while achieving the same performance as the GLRT detector for the Z-Opt constellation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑