现代通信系统4×4天线的准正交STBC编码

Quasi-Orthogonal STBC for 4×4 Antennas in Modern Communication System

针对4发4收天线设计了一种运用球体填充方式、具备分组解码性质准正交时空块状编码。通过计算推导与仿真验证,文章设计的新编码方式较目前4×4双组可解最优QSTBC编码方式具备明显性能方面的优势,并且具有相似的解码复杂度,且能有效解决当通信系统使用复杂星座图或天线数量超过2个的正交时空块状编码码率永远低于1的问题。文章提出的利用球体填充的编码方法既能保留传统编码的分组解码特性,又具备优于传统编码的性能。

A 4×4 two-group decodable quasi-orthogonal space-time block code within sphere packing was designed for 4×4 antennas.According to both calculations and simulations,the proposed QSTBC has a comparable complexity and a better performance than that of the current best 4×4 two-group decodable QSTBCs.Moreover,the problem that the traditional OSTBC was always suffered by its low code rate when complex constellations and more than two antennas were employed in communication systems can be properly solved.Therefore,the proposed coding approach not only remains the previous advantages,but also generates obvious improvement by utilizing the sphere packing method.