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分集增益
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  diversity gain
     Threaded Algebraic Space Time (TAST) code achieves the full diversity gain without the loss of code rate, and fits the high-rate transmission.
     纹状代数空时码(Threaded Algebraic Space Time code,TAST)具有在不牺牲码率的条件下获得全部分集增益的良好性能,适合于高速率传输。
短句来源
     The LDPC-DSTC system can offer both the diversity gain and coding gain.
     研究结果表明,LDPC-DSTC系统既能够实现分集增益,又能提供编码增益,有效地提高了系统性能。
短句来源
     RESEARCH ON DIVERSITY GAIN OF OFDM-MIMO SYSTEMS
     基于OFDM的MIMO系统的空间复用增益和分集增益研究
短句来源
     Through“Interference Nulling”and“Interference Cancellation”operation and“Decision Feedback”, this algorithm can accumulate signal diversity gain to improve its performance. But the original BLAST algorithm has a very high computational cost because of the nulling and cancellation step.
     该算法通过“干扰置零”(Interference Nulling)与“干扰消除”(Interference Cancellation)操作以及“负反馈”(Decision Feedback)思想来积累信号分集增益,提高算法的检测性能。
短句来源
     Although the structure of STBC decoding is very simple, it can achieve the same diversity gain as the method of MRC, and its use of the spectrum is very high.
     由于空时分组码编译码器的结构相当简单,却能获得与最大比合并相同的分集增益,并且它的频谱利用率高,已经被引用到3GPP1中。
短句来源
更多       
  diversity gains
     Both the numerical and simulation results demonstrate that the proposed receiver achieves smaller modeling error and significant diversity gains for a given factor comparison to the model of linearly frequency-selective channel.
     理论和仿真结果均表明,采用这种等效模型的接收机比采用线性频率选择性信道等效模型的接收机获得了更小的等效误差和更大的分集增益,从而更好地解决了RAKE接收机所不能区分的码片内延时的问题。
短句来源
     Combined MIMO with OFDM,diversity gains can be obtained to improve the performance of the systems effectively.
     通过将MIMO技术与OFDM技术结合,能够充分发挥各自特点,从而更有效地获得分集增益,提高系统容量及性能。
短句来源
     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.
     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 .
短句来源
     A scheduling and power allocation algorithm was developed in a combined orthogonal frequency division multiplexing(OFDM) access and spatial multiplexing multiuser multiple input multiple output(MIMO) access environment to introduce diversity gains to fully utilize radio resources.
     为进一步引入分集增益以提高无线资源频谱利用率,针对多用户多输入多输出-正交频分复用(MIMO-OFDM)系统下行传输,提出联合OFDM和多用户空间复用MIMO混合接入方式下的用户调度和功率分配算法。
短句来源
     Performance analysis shows that with uncorrelated transmit and receive antennas the TAS/MRC scheme can achieve full diversity gains and if all the transmit antennas are used,the diversity gains of the system decrease as receive correlation increases and degrades the performance of the system.
     性能分析表明:采用不相关的发射和接收天线,TAS/MRC方法能实现满分集增益; 随着接收相关的增强,系统的分集增益减小,性能下降;
短句来源
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  diversity advantage
     Modeling the channel as AR1 autoregressive model,the proposed decoder performs robust performance to remove ITAI by restricted zero-forcing method or cholesky decomposition after diversity advantage combining(DAC) at receiver.
     所提方案中信道用一阶自回归模型建立,在多接收天线时,通过分集增益合并(diversity advantagecombiner,DAC)后,采用约束置零或cholesky分解的方法移除发送天线间互干扰。
短句来源
     Compared with BLAST-TAS, under the same spectral efficiency, the proposed scheme shows significant diversity advantage.
     在相同的频谱效率下,与BLAST-TAS相比,所提方案表现出明显的分集增益;
短句来源
  “分集增益”译为未确定词的双语例句
     On the basis of analyzing the Maximalratio Receiver Combining (MRRC) scheme,a simple 2branch transmit diversity technique is introduced in this paper,which uses 2 transmit antennas and 1 receive antenna.
     在分析接收分集技术最大比率接收合并(MRRC)方案的基础上,介绍了一种两分支发送分集方案。 该方案采用2个发射天线、1个接收天线,可提供与1个发送天线、2个接收天线情况下的MRRC方案相同的分集增益
短句来源
     Diversity of MIMO STBC and adaptive OFDMA under correlated fading channel
     相关衰落信道MIMO STBC分集增益与多用户自适应OFDMA研究
短句来源
     For 1 bit/s/Hz average bandwidth efficiency, the uncoded adaptive OFDM scheme with two transmitters and two receivers yields about 35 dB gains for a BER of 10 -5 compared to the conventional OFDM system.
     在无信道编码和误比特率为 10 - 5条件下 ,对于平均带宽效率为1bit/ (s.Hz)的双天线发射分集接收的自适应 OFDM系统与传统 OFDM系统相比可以获得约 35 d B的自适应分集增益
短句来源
     The analysis and simulation results show that the capacity of mulituser diversity systems is influenced by such factors as the number of the users,the number of transmitting antennas,the number of receiving antennas,the scheme of resources scheduling and power assignment,and the combination of spatial diversity and multiuser diversity.
     结果表明,用户个数、发送天线的个数、接收天线的个数、资源调度方法、功率分配方案、空间分集和多用户分集的联合方式等,都对多用户分集系统的容量有着不同程度的影响。 只有综合考虑各种因素,才能最大限度地获得多用户分集增益,否则可能得到相反的效果。
短句来源
     Space-time based cooperative diversity can achieve full spatial diversity in the number of cooperating terminals.
     基于空时编码的合作分集技术在理论上可以实现完全的空间分集增益,分集系数等于参与合作的节点数量。
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  diversity gain
Space-time trellis codes can achieve the best tradeoff among bandwidth efficiency, diversity gain, constellation size and trellis complexity.
      
In MultiCarrier Code-Division Multiple-Access (MC-CDMA) system, the received signals scattered in the frequency domain are combined to get frequency diversity gain.
      
However, the frequency diversity gain is limited because of correlation between subcarriers.
      
By using interleaving, frequency diversity gain of system is increased.
      
Both of the good error correcting capability of TPC and the large diversity gain of STBC can be achieved simultaneously.
      
更多          
  diversity gains
Space-Time Block (STB) code has been an effective transmit diversity technique for combating fading due to its orthogonal design, simple decoding and high diversity gains.
      
In particular, the role played by the distributed coding protocols in achieving diversity gains is investigated in connection with the co-operative communications model built via relay channels.
      
The measured data was analyzed and signalcross-correlations, signal mean levels of individualreceiving branches and diversity gains of differentreceiving antenna separations (horizontal, verticaland compound) were evaluated.
      
The obtained resultsalso showed that horizontal, vertical and compoundspace diversity gains are almost the same.
      
One important issue to utilize the powerful diversity gains of those multi-antenna technologies is how to create independent channels between transmitter and receiver.
      
更多          
  diversity advantage
A differential space-time block code (DSTBC) provides full diversity advantage and does not require any radio channel estimation in the receiver, which makes it an attractive alternative to the well-known coherent space-time block code (STBC).
      
Assuming, one receive antenna, these codes provide a diversity advantage of two.
      
Assuming correct decisions in the first and second stage of decoding, a diversity advantage of two is achieved in the third stage.
      
Diversity advantage changes the slope of the average probability for Rayleigh fading channels at high SNR.
      
Design Rules 1 and 2 guarantee diversity advantage for this code.
      
更多          


The design philosophy of the frequency diversity radar receiver is introduced in this pa- per.A compromise between frequency diversity gain and channel numbers for improving detection perfor- manes is analysed.The problems of hardware design relative to frequency diversity are discussed. Finally,the results of flight test are given.

介绍频率分集雷达接收机的设计原理,分析了频率分集增益与通道数的关系以及频率分集对检测性能的改善,阐述了与频率分集相关的硬件设计问题。最后给出试飞的结果。

In a multipath environment an uncoded OFDM transmission system has a bit error rate (BER) comparable with a narrowband radio channel because the fading of each subcarrier is frequency nonselective.To overcome this behaviour and to increase the BER performance acombination of OFDM and CDMA has been proposed recently.In an OFDM CDMA scheme the energy of each information symbol is spread over all subcarriers.Therefore a diversity gain can be obtained in a broadband fading channel.In this paper we discuss the...

In a multipath environment an uncoded OFDM transmission system has a bit error rate (BER) comparable with a narrowband radio channel because the fading of each subcarrier is frequency nonselective.To overcome this behaviour and to increase the BER performance acombination of OFDM and CDMA has been proposed recently.In an OFDM CDMA scheme the energy of each information symbol is spread over all subcarriers.Therefore a diversity gain can be obtained in a broadband fading channel.In this paper we discuss the performance of coherent OFDM CDMA in a frequency selective Rayleigh fading channel.Channel estimation and equalization are integral parts that determine the performance of the system.Quantitative comparison of three equalization algorithms in a Rayleigh fading environment with noisy channel state information (CSI) will be presented:Orthogonality Restoring Correlation (ORC),ORC with a threshold in order to suppress subcarriers with low signal strength (TORC) and an iterative improvement based on a maximum likelihood approach.

在多路径环境下,因为每一个副载波的衰落是不能进行频率选择的,一个无编码正交频分复用传输系统与窄带无线电传输信道相比较,有一个误码率问题。要克服这种情况,以减低误码率,最近提出合并正交频分复用与码分多址。在一个正交频分复用-码分多址图案中,每一个信息符号的能量都扩散到所有副载波中。因此,在宽带衰落信道中可获得分集增益。本文将讨论在频率选择性瑞利衰减信道中相干正交频分复用-码分多址的性能问题。信道估值和均衡是决定系统性能的主要部分。文中将给出在加有噪声的信道中,瑞利衰落环境下的三个均衡算法的定量比较:正交恢复相关算法(ORC),为了抑制带有低信号能量的副载波而加上门限的正交恢复相关算法(TORC)和最大似然比算法

This paper makes qualitative analysis to the performance of soft handover technology of downlink WCDMA(Wideband code division multiple access) system,which will play an important role in the third generation mobile communication system.Taking handover margin as a criterion,it also gives a comparison between hard handover and soft handover.Moreover,the macro diversity effect has been studied in detail.At the end of this paper,some equations are derived,in which two important parameters,i.e.,multipath characteristics...

This paper makes qualitative analysis to the performance of soft handover technology of downlink WCDMA(Wideband code division multiple access) system,which will play an important role in the third generation mobile communication system.Taking handover margin as a criterion,it also gives a comparison between hard handover and soft handover.Moreover,the macro diversity effect has been studied in detail.At the end of this paper,some equations are derived,in which two important parameters,i.e.,multipath characteristics and the user density in the cell,have close relation to the macro diversity gain.

本文对宽带码分多址 (WCDMA)系统下行链路的软切换技术进行了定性分析 ,引入了新的软切换参数 :切换边际值 ,并与硬切换技术进行了比较 ,此外还对软切换宏蜂窝分集效应进行了研究 ,得出了宏蜂窝分集增益与信道多径特性和小区用户密度两个重要参数之间的关系式

 
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