KPMG's British firm has introduced time codes so that employees can account for how long they spend dealing with staff matters.
毕马威(KPMG)英国公司已经引入了时间编码，用来计算员工在职工事务方面所耗费的时间。
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。
On the symbol detection of layered space time codes, it is assumed that the perfect channel estimations are available at the receiver.
提出一种基于旋转不变子空间的垂直分层空时码及其直接信号检测算法。
A decoding algorithm based on the tree-structured constellation design was presented in order to reduce the decoding complexity of unitary space-time codes.
针对酉空时码最大似然检测复杂度高的问题，提出了一种酉空时星座的设计及低复杂度译码方法。
Firstly, the paper analyses the space-time channel model and space-time signal systematically, as space-time codes belong to the technology dealing with space and time.
首先，由于空时编码是利用时间和空间的结合，属于空时处理技术，本文对空时信道模型和空时信号处理作了系统的分析。
Based on the simple analyses of the MIMO system, this paper discusses and compares the performance and the complexity of the detection algorithms of layered space-time codes.
本文在对MIMO系统作简要分析的基础上讨论了应用于分层空时系统的各种检测算法，并对其进行了性能及复杂度比较。
In this paper, by combining the subspace method with layered space-time codes, we propose a vertical layered space-time code and accomplish the channel estimation without the training symbols.
本文将信号处理中的子空间方法同分层空时码的编码结构相结合，提出了一种垂直分层空时编码，实现了无需训练序列的信道估计。
In this paper, we mainly compare the performance of the two space-time codes in many aspects, such as design criterion, transmission rate, diversity gain, code gain and arithmetic complexity etc.
在本文中，本文对这两种编码方式在设计准则、传输速率、分集增益、编码增益和算法复杂性等方面进行了较为详尽的比较研究。
Power Allocation(PA) and Space Time Codes(STC) are the key techniques of the Multiple-Input Multiple-Output(MIMO) to increase spectral efficiency and improve performance.
运用功率分配和空时编码技术可以在MIMO系统中提高频谱效率、改善系统性能。
Based on the above, the impact of amplitude coefficient ratio on amplitude-phase Double Differential Space-Time Codes is discussed, and an optimal selection scheme in amplitude coefficient is given.
在此基础上，讨论了幅度系数比对幅度相位双差分空时码的影响，并给出了一种最佳的幅度系数选择方案。
Based on the above, the impact of amplitude coefficient ratio on amplitude-phase Double Differential Space-Time Codes is discussed, and an optimal selection scheme in amplitude coefficient is given.
在此基础上，讨论了幅度系数比对幅度相位双差分空时码的影响，并给出了一种最佳的幅度系数选择方案。
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