unitary space

STC technology can divide into: Layered space-time coding ( LSTC), space-time trellis code modulation ( ST-TCM), Unitary space-time coding ( USTC), differential space-time coding ( DSTC).

空时编码分为：分层空时编码、空时格型编码和酉空时编码、差分空时编码。

Starting from the precise pair-wise error probability ( PEP), the joint border of group coding signal error probability ( SEP) in differential unitary space – time ( DUST) modulation is deduced.

从精确成对错误概率（PEP）出发，推导得到了DUST调制群码符号误码率（SEP）的联合边界。

Based on cyclic diagonal codes, an improved design of unitary space-time codes ( USTC) at low SNR is proposed.

在低信噪比情况下，提出了一种基于循环对角码的改进的酉空时码设计。

DOA estimation in correlated noise fields using unitary spatio-temporal correlation matrices Space time Code

利用空时相关矩阵酉变换估计波达方向

The concept of generalized Unitary space is given, and several inequalities on the traces of quaternion matrices are proved by using properties of the internal product of quaternion vector and Unitary similarity theory of quaternion matrices.

给出了广义西空间的概念，并利用其中向量内积的性质及四元数体上方阵的酉相似理论，建立了几个自共轭四元数矩阵之迹的不等式。