因此，在宽带衰落信道中可获得分集增益。
Therefore a diversity gain can be obtained in a broadband fading channel.
该方案能获得最大传输速率，但不能提供最大的分集增益。
It has full transmission rate, but could not provide full diversity order.
在频率选择性信道中，新编码策略可以获得空时频全分集增益。
The new coded strategy can achieve full space-time-frequency diversity over frequency selective fading channel.
提出了一种基于OFDM达到最大可达分集增益的空频码设计方案。
A novel design of OFDM-based space-frequency codes is proposed such that the maximum achievable diversity gain is available.
该方法在时域进行差分编码，而在频域进行空频编码以获得分集增益。
The differential coding is performed in the time domain, while the space-frequency coding is processed in the frequency domain to achieve the diversity ga.
得出分集增益不受信道相关性的影响，但是编码增益则有一定的损耗的结论。
Furthermore, we conclude that the channel fading correlation has nothing to do with diversity advantage, but the code advantage will be affected.
多输入多输出(MIMO)技术可以为系统提供空间复用增益和空间分集增益。
Spatial multiplexing and space diversity gain of a system can be extracted through MIMO technique.
但是，空时分组编码只具有分集增益而缺乏编码增益，这使其在纠错能力上大为逊色。
However, STBC only shows diversity gain but free of coding gain. Consequently, the error capacity of an STBC design is limited.
多接收天线可以对判决似然比和迭代译码的外部信息提供分集增益，从而进一步提高系统性能。
Multi-receive antennas can also provide the diversity gain for LLR information and iterative extrinsic information.
分集增益的取值与分组长度有关，只有当分组长度不小于发射天线数目时才能获得满分集增益。
The diversity gain is relative to the block length, and can amount to the full diversity gain only when the block length is no less than the number of transmit antennas.
该方法充分利用多用户系统用户分集增益的特点，将信道资源尽量分配给信道质量较高的用户。
The inventive method fully utilizes the user diversity increment of the multi-user system to distribute the channel resource to the user of higher channel quality at most.
已有研究表明，MIMO系统可以同时提供分集增益和复用增益，以提高传输的可靠性和有效性。
Existing research shows that MIMO systems can provide diversity gain and multiplexing gain at the same time to improve the transmission reliability and efficiency.
在无线中继网络中采用网络编码技术，可在不损失分集增益的前提下有效提高中继节点的转发效率。
In the wireless relay network, the transmission efficiency of the relay node can be improved effectively without loss of diversity gain via the network coding technique.
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.
在无线衰落信道环境中，协作中继是一种增加额外分集增益的有效方法，而网络编码可以用来提高网络吞吐量。
In the wireless fading channel environment, cooperative relaying is an effective way to increase additional diversity gain, and network coding can be used to increase network throughput.
对OFDM系统提出将空时编码与自适应功率控制技术相结合，给出了仿真结果，提高了分集增益和自适应增益。
For the OFDM system, a scheme of combining space-time code with the adaptive power control technology is proposed with simulation results, which increases the diversity gain and the adaptive gain.
该方案的主要特征是，认知中继使用的协作机制结合了协作传输和协作中继，可以获得空间分集和频谱分集增益。
The key feature of the proposed scheme is that, the cognitive relay combines cooperative transmission and cooperative relay, as a result, both spatial diversity and spectrum diversity can be obtained.
CDM系统虽然获得了频率分集增益，但是，它必须通过有效的检测技术才能使其性能较之OFDM系统有所改善。
Although the additional frequency diversity gain can be attained, by using efficient detection techniques, the performance of OFDM-CDM system is better than that of conventional OFDM.
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。
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.
VBLAST可以有效提高多发射天线系统容量，而STBC则具有较高的分集增益，通过将两种方案结合起来组成一个新的系统。
The VBLAST can be used to exploit the capacity potential provided by multiple transmit antenna systems. The STBC has higher diversity gain.
文章针对多输入多输出（MIMO）系统在移动终端实现上的限制，提出分布式天线系统（DAS）的解决方案来获得空间分集增益。
Due to the limitation of mobile terminal implementation in MIMO systems, Distributed Antenna System (DAS) is proposed to provide space diversity 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.
针对MB - OFDMUWB系统的性能特征，基于理论分析系统的成对错误概率，获知编码增益和分集增益的计算公式，从而得到空时频编码方案的设计准则。
Aiming at the performance characteristics of MB-OFDM UWB, the formula for coding gain and diversity gain is worked out based on pairwise error probability of theoretical analyzing system.
这种编码在相同的码速率下，实现了比stbc更大的分集度和更高的编码增益。
Using this new scheme, higher diversity order and coding gain can be achieved than STBC at the same coding rate.
它可根据两支路信号电平之比值来自适应地或是工作于等增益合并模式，或是工作于选择分集模式。
It can work in ei - ther an equal-gain combining mode or a selection mode adaptively according to the ratio between the signal levels in the two branches.
由于中继节点的参与，该协议可充分利用多用户协作的空间分集和出错重传所带来的时间分集和编码增益。
As the relay node's involvement, the agreement can take full advantage of multi-user cooperative spatial diversity and the time diversity and coding gain from retransmission mechanism.
特别是在移动台低速移动，而信道可用径较少的环境下，发送分集技术可以获得相当可观的性能增益。
Transmission diversity can achieve a considerable performance gain especially in the channel that lacks of available paths.
主天线（100）和分集天线（105）是在物理上分开的，并且其取向使得它们具有不同的天线增益图形。
The main antenna (100) and diversity antenna (105) are physically separated and oriented such that they have different antenna gain patterns.
主天线（100）和分集天线（105）是在物理上分开的，并且其取向使得它们具有不同的天线增益图形。
The main antenna (100) and diversity antenna (105) are physically separated and oriented such that they have different antenna gain patterns.
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