信源

Lastly, two methods to estimate DOAs of coherent sources impinging on UCA are introduced, and simulation results have verified the effectiveness of these algorithms.

本文对基于圆阵的模式空间概念的模式平滑波达方向估计算法进行了性能仿真研究，仿真结果表明这些算法可以有效地实现对相干信源波达方向的估计。

To overcome the situation of information unsymmetrical, it will be necessary to build a system of communication.

消费者却并不了解这一点，他仍然认为假冒商标商品来源于生产者，其实质是增加了信源的冗余度，降低了通信效率。

To overcome the situation of information unsymmetrical, it will be necessary to build a system of communication.

消费 者却并不领会这一点，它仍然觉得假冒商标商品滥觞于生产者，其本色是增加了信源的冗余度，降低了通信效率。

But for different specialties people gave different models for secure network coding. For instance, J P Vilela introduced light weight secure network coding, and K Bhattad introduced weakly secure network coding. When considering the practical secure network, we must think over the network coding that resists active attack, that is to say resists Byzantine attack. In this paper we also introduce such kind of network coding.

蔡宁和杨伟豪首先针对单信源有向无圈网络给出了安全网络编码的定义和模型，其他研究者也各自提出了不同的安全模型，如J P Vilela提出了轻量级安全的网络编码，K Bhattad提出了弱安全的网络编码等，另外还有抗拜占庭攻击的网络编码。

Based on the requisition of wireless system debugging, this paper develops a novel radio-frequency beaconing. Design method and system constitution of a novel beaconing based on PLL IC PE3336 are given, and the accomplish method of the system's hardware and software arc expounded. The test results show that the beaconing adopted in this method has a reliable and stable frequency conversion features. The more applications in the wireless system find that the users can set necessary frequency conveniently. Especial1, the friendly man-machine interface makes the operation is more flexible. It is as excellent performance-price-ratio beaconing, and as a signal source, it can be used in the research and the debug procession of variable radio-frequency components.

根据无线电数据链系统及部件的调试需要，研制开发了一种新型的以锁相环为核心、由单片机控制的射频信标机；文中给出了基于锁相环芯片PE3336的新型信标机的设计方法与系统组成，阐述了系统硬件及软件的具体实现为法；测试结果表明，利用该方法设计的信标机具有稳定、可靠的变频特性，且各项指标均达到了要求；进一步在某无线电系统中的应用发现，用户可方便地设置所需频点；特别是友好的人机界面，使用户操作更为灵活方便，是一种性能价格比优良的信标机；并可作为信源用于不同的射频部件研制与调试过程中。

The uniform distribution of phase data and the Rayleigh distribution of amplitude data are investigated and the bit allocation formula is deduced according to the differential entropy of continuous information resource, which points out that the mean of amplitude is the only factor.

进一步研究了相位的均匀分布特性和幅度的瑞利分布特性，由连续信源微分熵定义推导了幅相比特分配的幅度均值公式，指出幅度均值是决定幅相比特分配的唯一因素。

Transport stream decoding is SDTV and HDTV source decoding software. It can decode the transport stream files in hard disk into DTV signal then broadcast, fast forward, fast rewind or pause them on screen.

传输流软件解码是一套标清和高清信源解码软件，能将硬盘上的传输流文件解码为数字电视信号，并可以在屏幕上对其进行快进、快退、暂停、播放。

Based on statistics states for source coding and study of a design of CDMA structured codebooks, the paper also presents the basic set-up of side information-aided at decoder, and approaches a good transmission performances under low-WNR and high-WNR that corresponds to the attack channel ambiguity.

该方法在分析信源编码的统计基础上，通过研究CDMA结构性码本的设计条件，在接收端利用边信息辅助解码，达到了在攻击信道条件下，适应于高低WNR环境的数据隐藏通信模式。

At first the Digital frequency shifting repeater transforms the original signal to the 70MHz IF signal in the donor, then the Frequency shift relay digital processing unit Digital Spread Spectrum the IF signal and through the 5.8GHZ signal to transmit to the remote end.

数字移频直放站首先在近端机内将将信源信号转换为数字70MHZ中频信号，通过&移频中继数字处理单元&将中频信号数字扩频后通过5.8GHZ的信号传送到远端。

Imbursed by the sub-item"Research on System Framework of Joint Source-Channel Coding under Wireless Circumstance"of national high-tech research and development plan(863 plan)"Digital Audio, Video Encoding, Transmission, Testing and Applying Model"(No.2002AA119010), and the great item"Research of Future Communication System Fundamental Theory and Technology (No.60496315)", the dissertation studies several key techniques of Low-Density Parity-Check Codes that were considered much in error correction codes field.

本文正是在国家高技术研究发展计划(863计划)&数字音视频编码、传输、测试与应用示范&(No.2002AA119010)的子课题&基于无线环境的联合信源信道系统框架研究&、国家自然科学基金重大项目&未来移动通信系统基础理论与技术研究(No.60496315)&等研究项目的资助下，对近年来在纠错码领域表现抢眼的低密度校验码(Low-Density Parity-Check Codes，LDPC)的若干关键技术展开了研究。

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。