三刻钟内用加特林机枪在三十码处不能击中一个教堂的年轻人，却可以站在百码开外，举起一把空膛的旧火枪，趟趟把祖母当靶子击倒。
A youth who can't hit a cathedral at thirty yards with a Gatling gun in three quarters of an hour, can take up an old empty musket and bag his grandmother every time, at a hundred.
空响应带有不同的状态码：PUT请求的响应没有任何内容，但是有不同的状态码。
Empty response with different status code: the response of the PUT request will not have any content, but will have a different status code.
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.
最后，在空时区块码不同的正交矩阵之下，展现出我们的模拟结果。
Finally, we present our simulation results under different encoding scheme of the space time block code.
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.
而以牺牲正交性和部分分集增益为代价来获得更高传输速率的非正交空时分组码又会使误码性能降低。
Whereas the non-orthogonal space-time block codes which obtain higher transmission rate at the cost of orthogonality and partial diversity gain may degrade the performance.
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.
本文提出了一种新的四天线准正交空时分组码的通用设计方法。
In this paper, a novel general design method of quasi-orthogonal space-time block codes for four antennae is presented.
根据不同的传输需求，正交线性空时弥散码的形式还可以灵活变化。
Orthogonal linear dispersive space time code can also be used as an adaptive one for different application requirement.
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.
针对这种情况，本文给出了一种空时网格码的正交设计方法。 这种方法可以用来构造大天线数目的码字，从而避免了繁琐的码字搜索过程。
So we put forward an orthogonal method which can be used to design the STTC with large number of transmit antennas and avoid the complicated search for the code.
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.
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.
但由于空时分组码受正交条件限制，传输效率得不到提高，而BLAST系统存在差错传播制约着误码率的下降。
But the data efficiency of STBC is restricted to orthogonal transmission and the bit error rate of BLAST is high due to the error propagation.
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.
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.
针对分布式小区架构的小区间干扰抑制问题，提出了一种结合空时分组码(STBC)的小区间干扰协调策略。
To mitigate inter-cell interference in distributed cellular architecture, an inter-cell interference coordination scheme with space time block coding (STBC) is proposed.
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.
通过在OFDM通信系统中应用新型差分空时分组码（DSTBC），获得编码增益，无需信道估计。
By using new DSTBC in OFDM communications system channel estimation is nto necessary and coding gain is gotten.
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.
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.
在保证满分集度的前提下，尽可能提高码率，并优化时延分组数，才是多发射天线构架复信号空时分组码设计的更明智的选择。
So it is a more wise choice to increase the transmission rate and optimize the time slot block number on the condition of keeping the full diversity order in STBC design.
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.
针对此问题，提出了一种新的基于空时分组码(STBC)的并行选择映射算法。
A novel concurrent selective mapping (SLM) algorithm with space-time block coded (STBC) was proposed to solve this problem.
对于PS K调制下的空频块码，复数球形译码相对实数球形译码有较低的复杂度。
The complex sphere decoding has lower complexity compared with real sphere decoding for space-frequency block codes with PSK modulation.
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.
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.
对于使用阵列天线的直接序列扩谱系统，提出使用空时相关器方法实现码捕获和自适应波束形成权值捕获。
For DSSS system with antenna array, the spatial-temporal correlator (STC) is proposed for the acquisition of the PN code and adaptive beamforming weight.
该文考虑空时分组码多载波码分多址（MC-CDMA）系统的盲干扰抑制。
This paper considers blind interference suppression for a space-time block coded MultiCarrier CDMA (MC-CDMA) system.
该文考虑空时分组码多载波码分多址（MC-CDMA）系统的盲干扰抑制。
This paper considers blind interference suppression for a space-time block coded MultiCarrier CDMA (MC-CDMA) system.
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