For the first time, the performances of hybrid ARQ based on RS code over Gilbert bursty channels are analyzed in this thesis, from which the important performance measures such as packet error rate, average transmission times, throughput efficiency and transmission delay are formulated.
文中首次对基于RS码的混合型ARQ在Gilbert突发信道上的性能进行了理论分析，并导出了系统重要性能指标，如分组错误率、平均传输次数、ARQ系统的通过效率、平均传输时延等的解析表达式。
The method is based on clock circle dived principle. The time errors in direct digital counting method are converted to digital flash-code by latching the output of FPGA delay cells.
FPGA延迟线插入法是在直接计数法的基础上，采用FPGA内部延时单元将时间间隔转化为数字量，经高速锁存器锁存后得到代表延时信息的温度计编码值来实现高分辨率的时间测量。
Its method includes: parallel-serial conversion of sending terminal, using frame-alignment clock so a route of data, making electro-optical conversion, using optical fibre to transfer data code flow electro-optical converted together with frame-alignment clock; photoelectric conversion in receiving terminal, serial/parallel conversion, using phase difference regulating circuit to eliminate transmission time delay.
其方法包括：发送端的并／串变换，并将帧同步时钟也作为一路数据；进行电／光转换；由光纤将经电／光转换后的数据码流伴随帧同步时钟一齐传输；接收端的光／电转换；串／并变换；由相差调整电路消除传输时延。
The driving circuit and a method of Chinese character coding in an embedded LED array display system are discussed in this paper. 74LS273 and 9013 work as row driving chip, and 74LS374 works as line driving chip; they work with the address-seeking circuit, dynamically drive each LED dot; in display program, the approach of row-scanning, output code in line order, with 4-segment coding, display Chinese character in a LED array without pause and delay.
论述了一种小型嵌入式LED点阵显示系统的驱动电路和汉字编码方法；驱动电路采用行驱动芯片74LS273和9013，列驱动芯片74LS374，结合寻址电路，对每个LED点动态驱动；显示程序采用行扫描，列顺序输出码值的方法，结合四段式汉字编码方法，无间断和延迟的在LED阵上输出汉字。
In chapter 4, the theoretical analysis and the mathematical model for the BER performance of code division multiple access with direct sequence spectrum spreading system under the effects of delay spread are presented in this chapter.
第四章 对直接扩频通信系统在多路径传播脉冲时延及时延展宽作用下的传输误码率特性进行了理论分析，研究了脉冲时延展宽与传输误码率之间的变化关系。
Federal Reserve Board, Foreign payment Allocation security code (786PR/FRBN) SECURITY CONFIDENTIAL DIPLOMATIC IMMUNITY PAYMENT DEAR lt has just come to our notice to credit $10.5million to your account and we are very sorry for the delay so far, lt was due to some auditing process and the pannel that just completed their quarterly seating over the expenditure and revenue before your file was finaly forwarded to my office for lmmediate attention.
美国联邦储备委员会。对外付款的配置安全代码(786PR/FRBN)。安全保密的外交豁免权的付款方式。亲爱的。lt刚来到我们注重信誉10.5million美元到你的帐号，我们都非常好。对不起，到目前为止，肝移植是由于一些审计过程和pannel。刚刚解决了他们的支出，每季座位收入之前，你的文件。我是最后lmmediate转交给办公室的关注。
If you fail to supply sufficient observations in your initial batch, you will experience a longer than usual delay before an observatory code is assigned.
如果你在第一次上报时没有按要求提供相关的观测地信息，你将可能等更长的时间来获得编号。
We designed the driven-pulse generator module whose focusing delay, pulse width, pulse repetition frequency can be dynamically controlled by pre-computed codes. Also we achieved linear scanning control and probe impulse control and function code storage and other system functions both in a signal FPGA chip. Both the function simulation and timing simulation results of this sub-system show that it lays a good foundation on building high speed, high precision, fully digitalized, highly integrated modern medical ultrasonic diagnostic equipments. This paper will help to the researching and producing process. It is fresh air to the biomedical electronics, medical instrument, and medicine ultrasonic.
在单片FPGA 芯片内部设计实现了聚焦延时、脉宽和重复频率可动态控制的发射驱动脉冲产生器、线扫控制、探头激励控制、功能码存储等功能模块，功能仿真和时序分析结果表明该子系统为设计实现高速度、高精度、高集成度的全数字化超声诊断设备打下了良好的基础，将加快其研发和制造进程，为生物医学电子、医疗设备和超声诊断等方面带来新思路。
ITU-T G.729 speech coding protocol, which adopted the Conjungate-Structure Algebraic-Code-Excited Linear-Predictiontechnology. It has the performance of codin rate of 8Kbit/s, low delay and high reconstructed speech quality.
ITU-T G.729语音编码方案采用共轭结构代数码本激励线性预测技术，算法具有8Kbit/s的编码速率、较低的延迟和高编码语音质量。
In order to evaluate this model, JANSIM (Java-based Active Network SIMulator) is designed and implemented, The creative result of this project are: an implementation scheme of function components of active network node is proposed based on which an active network prototype - ANSoft is implemented; a dispensing mechanism of active code is proposed which conquer the problems such as end-to-end delay, code consistency and replacement of memory; A pluggable security prototype is developed in the active network; An active capability is introduced to describe authorization policy; the decode-binding realizes the expansion capacity of the encryption methods in the system.
在此基础上取得的创新性研究成果主要有：提出了主动节点各功能组件的具体实现方案并在其基础上实现了原型系统ANSoft；提出了一种主动代码分发机制，解决了端端延迟，代码一致性和存储替换的问题；设计并实现了主动网络可扩展安全机制；提出了利用权能设计动态策略配置。
In this paper, the effect of time-delay and Doppler frequency in acquisition of PN code is analyzed, using maximal-length shift register sequence as research object. It is shown that delay-Doppler cross effect is neglectable in most cases.
以m序列为研究对象，首先针对一种典型的相关过程分析了其时延、多普勒频移对相关的联合影响，结论表明两者耦合影响非常小，几乎可忽略不计。
There is a lots of constant definition in the VHDL code, it make the use very convenient. In design, the using of Delay-Locked Loop provided by the chip make the communication fully synchronous.
VHDL源代码中定义了大量的常量，使其运用非常方便；设计中运用了芯片提供的延迟锁相环，使得通信达到了完全的同步。
GALILEO; global positioning system; code tracking; delay-locked loop
伽利略；全球定位系统；码元跟踪；延迟锁定环
Therefore, a new time synchronization protocol for Ad Hoc network by means of delay-probing was put forward, which combined the merits of DMTS protocol and TPSN protocol. Through transmitting and relaying a little probing code, the protocol could complete the retardation measuring.
通过分析影响时间同步性能的6类时延，构造了一种基于时延探测方式的Ad Hoc网络时间同步协议，协议通过发送和转发少量的探测码来完成节点间时延的测定。
The main innovations are:(1) Puts forward a new length-adaptive fractional harmonic pre-emphasize algorithm to improve the precision of pitch search; (2) Puts forward a new fractional harmonic-enhance algorithm for algebraic codebook and combines two different pulse-dispersion technologies both in encoder and in decoder to improve the random codebook excitation; (3) Puts forward new unsymmetrical algebraic codebook structure to utilize the unsymmetrical distribution of residual signal, therefore constructs random codebook efficiently at low bit-rate; (4) Puts forward the method of directing the gain quantization by predictor selection bit of LSP quantization to improve the quantization efficiency of speech transition; (5) Integrated the above improvements, two new low bit-rate high quality CELP speech coding algorithm are put forward: 4kb/s Multiple Pulse Dispersion-Algebraic Code Excited Linear Prediction and 3.3kb/s Multiple Pulse Dispersion-Un-Symmetrical Algebraic Code Excited Linear Prediction (MPD-USACELP). The speech quality and algorithm delay of the two new algorithms have reached the current international level.
主要成果有：（1）提出了一种新的长度自适应分数谐波预加重方法提高了基音周期搜索准确度；（2）提出了一种新的代数码本分数谐波增强算法，并结合使用编码器和解码器中两种不同的脉冲散布技术，有效改进了随机码本激励；（3）提出了新的非均匀代数码本结构，充分利用了余量信号幅度分布的非均匀性，在低速率下利用很少的比特很好的构造了随机码本；（4）提出了利用LSP量化预测器选择信息指导增益量化的方法，显著提高了语音过渡段的量化效率；（5）结合这些改进措施，设计并实现了两种新的低速率高质量CELP算法：4kb／s多重脉冲散布代数码本激励线性预测算法和3.3kb／s多重脉冲散布非均匀代数码本激励线性预测（MPD-USACELP）算法，两种新算法的质量都达到了国际同类算法的水平，并保持了较低的算法延时和算法复杂度。
Turbo code`s iterative decoding can provide an excellent performance, but it also brings on decoding complexity, decoding delay and power consumption.
迭代译码可以提高Turbo码的译码性能，但也是增加译码复杂性、延时及功率损耗的主要原因。
The system adopts layer structure, which can implement the single node layered and define the function behaviors on each layer. In the system, one layer is independent from each other in order to improve the reuse rate of the module code. In addition, it integrates energy-consumption, time-delay, packet-loss models and adopts database as a backstage supporter to strengthen simulation function and capability of storaging and processing experimental data. If providing the configuration file, we can simulate without the platform, which improve the portabillity of simulation examples.
该系统采用层结构，以实现单个传感器节点的分层和各层功能行为定义，节点各层的相互独立使模块代码复用率大大提高；功能上该系统集成了传感器网络能耗、时延和丢包统计模型，并采用后台数据库支持技术，增强了仿真实验的数据储存和处理能力；此外，系统也可支持配置文件和仿真文件的脱平台运行，具有很好的可移植性。
Research results indicate that, the hybrid error control scheme proposed in this chapter is simple and bandwidth efficiency. At the same time, because most of the error patterns can be corrected by powerful RS code, very low cell loss rate can be obtained with lirriited retransmission times. So the transmission delay caused by cell retransmission can be restricted to a reasonable extent to meet the strict delay/delay-jitter requirements of voice and real-time video services.
研究发现，我们所提出的混合纠错方案控制结构简单比、信道利用率高，而且，由于RS码强的纠错能力可以纠正大多数的错误图样，从而降低了WATM信元重传的概率，因此通过有限次的重传就可达到很低的信元丢失率，同时减小了因重传而引起的传输时延，从而可以满足话音、图象等实时业务对时延/时延抖动的严格要求。
Initial ranging provides initial entry, uplink synchronization, and system coordination. In the system initial state, multiple users transmit randomly selected ranging code set and BS conducts multiple user identification by ranging code identification and uplink synchronization by transmission delay estimation.
正交分频多重存取系统实体层进行的测距与调整是使用测距码进行，因此用户端欲进入网路之前，须随机选取测距码进行，在基地台使用测距码识别来实行多个使用者的识别机制，并藉由讯号传送延迟的估测来达到上行同步的动作。
A bipolar chirped optical code division multiple access schemes, based on a linear chirp fiber Bragg grating and fiber delay line, is proposed in this paper.
提出了一种基于线性啁啾布拉格光纤光栅和光纤延迟线的正负啁啾编码光码分多址方案。