介绍了空时码的编码和译码方法，以及设计空时码的准则。
The encoding and decoding method, as well as the design criterion are introduce .
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。
Based on cyclic diagonal codes, an improved design of unitary space-time codes (USTC) at low SNR is proposed.
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。
On the symbol detection of layered space time codes, it is assumed that the perfect channel estimations are available at the receiver.
与同速率的满秩网格空时码相比，它能获得更好的误码性能，并且实现简单。
Compared with the full rank space-time trellis code (FR-STTC) with the same transmission rate, it can provide a better performance and a lower realization complexity.
在介绍空时码的MIMO信息论基础上，系统地对三类空时码进行了分析比较。
In this paper, after introducing MIMO information theory about sp ace time code, three kinds of space time code are compared and analyzed systematically.
另外，证明了空时码的几何一致性并使用该特性大大地减少了空时码搜索的复杂度。
Furthermore, geometrical uniformity of STC is utilized to reduce the complexity of code search greatly.
本文基于一种“单环”相关信道模型，对空时分组码和差分空时码进行了分析和研究。
In this thesis, space-time block coding and differential space-time coding are discussed on the basis of "one-ring" correlated channel model.
鉴于酉空时码的独特结构，在差错概率公式中可以很容易地分析衰落相关系数矩阵带来的影响。
According to the special structure of unitary code, it is very simple to analyze the effect of fading correlation from the equation of PWEP.
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。
A decoding algorithm based on the tree-structured constellation design was presented in order to reduce the decoding complexity of unitary space-time codes.
对准静态衰落信道、快衰落信道以及介于两者之间的时变衰落信道下的空时码设计准则进行了研究。
The design criteria of space-time code (STC) for quasi-static fading channels, fast fading channels, and the time-varying fading channels are investigated.
随着码率的不断增加，酉空时码群中的各个星座点之间的乘积距离会变得越来越小，从而导致性能恶化。
With the increase of the code rate, the production distance between the constellation of the unitary group code decreases rapidly and deteriorates the performance of the system.
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.
然后对网格空时码（STTC）和分组空时码（STBC）的编译码原理、特点和性能进行了全面的分析；
Then the encoding and decoding theories, features and performances of STBC and STTC are detailed in all aspects.
空时码的提出为解决无线通信系统中的传输速率问题提供了一条新思路，目前已经成为通信研究的一个热点。
Space-time code indicates a new idea of providing high transmission rate in wireless communication systems and has recently received considerable attention.
考察了空时码的首事件差错概率，并基于首事件差错概率提出一种新的用于时变衰落信道的空时码混合设计准则。
The first-event error probability of STC is evaluated, and a new hybrid design criterion of space-time code for time-varying fading channels is proposed based on that probability.
差分酉空时码不需要任何信道状态信息，在通信终端处于高速移动环境下的快变衰落信道中仍能保持较好的性能。
Differential unitary space-time code(DUSTC) keeps good performance in rapidly fading channels when neither the transmitter nor the receiver knows the channel state information.
介绍了空时码在频率非选择性慢衰落信道下各种设计准则的推导过程，并对几种现有空时码进行了性能分析和比较。
This paper analyzed the impact of fading correlation on the noncoherent unitary space-time code, deduced the pair-wise error probability(PWEP) and Chernoff bound under fading correlation.
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, 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.
针对多输入多输出系统中现有的线性分散(LD)空时码编、解码复杂度高的问题，提出了一类正交线性分散(old)空时编码。
Focusing on the problem that existing linear dispersion (LD) space-time codes have a high encoding and decoding complexity, a type of orthogonal linear dispersion (OLD) space-time codes is proposed.
利用分组干扰抑制的方法，通过合理地设计空时码的发射码矩阵和对阵列天线进行了子阵划分，提出了一种新的混合型的空时编码方法。
A new hybrid space-time coding approach is presented in this paper. The properly designed code matrix and group interference suppression method are used in this approach.
主要介绍了发射分集技术中用于抗信道衰落和提高系统容量的空时分组码和分层空时码的原理和基本特点，并对这些空时编码技术进行了性能分析。
To overcome the bad performance in combating fading of BLAST and low code rate of STBC, a layered structure STBC is introduced in this article by combining BLAST and STBC.
用有限的空时码进行扩谱，并利用较少的发射天线和接收天线进行信号的发射与接收，从而在TD _ SCDMA移动接收端获得最大的扩谱增益。
Base_station USES finite number of space_time codes to spread, and small number of antennas to transmit and receive signal, thus TD_SCDMA mobile terminals can obtain maximal spreading gain.
但对分集增益而言，网格空时码和分组空时码均可达到系统所能提供的最大分集增益，而分层空时码由于受实现方式的制约，只能得到其中一部分分集增益。
But as to the diversity gains, STCM and STBC can achieve the maximum diversity that the system provides, while LST only obtains a small part of it because of its limited application.
目前，一种普遍的解决方法是将空时码与正交频分复用（OFDM）相结合，但需要假定信道变化缓慢，从而有足够的时间通过发送训练序列来进行信道估计。
Now, a general solution is that combining STC with OFDM, but it is supposed that the channel changes slowly, so there is enough time to transmit the training sequence for channel estimation.
发射端分集、编码和调制结合空时格码，可以有效地提高信号在无线衰落信道中传输的有效性和可靠性；
Space-time trellis code combining space diversity with code and modulation, can improve efficiency and reliability of communication system in wireless channel efficiently.
发射端分集、编码和调制结合空时格码，可以有效地提高信号在无线衰落信道中传输的有效性和可靠性；
Space-time trellis code combining space diversity with code and modulation, can improve efficiency and reliability of communication system in wireless channel efficiently.
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