循环相关

The m-sequence with Cyclic Prefix is inserted between OFDM symbols in time domain as training sequence. The cross-correlation is calculated between the received sequence with CP removed and the appointed circular shifted m-sequence, which takes reliability of the estimation of channel impulse response on account of the two-valued auto-correlation property of the m-sequence, thereby the channel frequency response can be advisably decided.

在时域OFDM符号之间插入附加循环前缀的m序列作为训练序列，在接收端将去掉循环前缀的接收序列与指定的循环移位m序列作相关运算，然后利用m序列的二值自相关特性获得信道的冲激响应估计，从而得到信道的频率响应估计。

A PN based Channel Estimation algorithm using circular correlation is proposed, and is implemented in Single Carrier Frequency Domain Equalization system.

提出了一种基于伪噪声序列循环相关的信道估计算法，并将之应用于单载波频域均衡系统中。

It is well known that the multi-value CDMA spreading codes can be designed by means of a pair of mirror multi-rate filter-banks based on some optimizing criteria. The dissertation indicates that there exists a theoretical bound in the performance of its circular correlation property, which can be described by an explicit expression.

研究了基于两带镜像多速率滤波器组来设计的多值CDMA扩展码的方法，并推导出了基于这种方法设计的码序列在循环相关特性方面所能达到的极限，以及达到此理论极限时应满足的条件；在此基础上，提出了一种基于熵最大化准则来产生CDMA扩展码的设计方法。

C/A codeˉacquisition ; FFT ; circular correlation ; realˉtime sof tware receiver

伪码捕获； FFT ；循环相关；实时软件接收机

When the signal sources have different cycle frequencies, a method to estimate the optimal time lag is presented. It solves the severe problem that the conventional Cyclic MUSIC requires knowing the optimal time lag in computing the cyclic correlation matrix. A method of two-step search for DOA estimation by employing an interleaving technique and a Joint Estimation Strategy is developed to overcome the inadequency of signal sources with the same cycle frequency having no optimal time lag.

当信源的循环频率各不相同时，提出了一种估计最佳延时的方法，解决了传统Cyclic MUSIC算法计算循环相关矩阵需要已知最佳延时的问题；为克服多个具有相同循环频率信源不存在最佳延时的不足，利用交错技术和联合估计策略，提出了两步搜索估计DOA的方法。

The paper summerizes several general pratical new techniques, such as the analyzers of program profiles, maximum potential parallelism, array privatizability, loop parallelism; the visualizers of the statement data dependence graph, procedural callgraph, loop iteration space graph and interactive tools of array privatization and unimodular transformation; the automatic techniques of array privatization combined data dependence and coverage, the computation of parallelizing unimodular transforming matrix for mult-nested loops, enhanced unimodular transformation with array reduction recognition, non-loop level parallelism revealing technique, dynamic dataflow analysis and optimization of cross-loop local cache reuses, etc.

本文从而概括了若干具有一般性的实用新技术，如：程序计算量分析、最大潜在并行性分析、数组私有化分析、循环并行性分析等动态程序分析技术；语句数据相关图、过程调用图、循环迭代空间相关图、交互数组私有化、交互幺模变换等可视化语义交互分析变换技术等等；总结了若干自动并行化新技术，如：结合相关和覆盖的数组私有化方法、对多层嵌套循环计算幺模并行化变换矩阵的循环幺模变换方法、结合数组规约识别增强幺模变换的技术、发掘非循环级并行性的技术、动态数据流分析技术、优化利用循环间Cache数据局部性的技术等等。

In this paper,we propose a modified SC-SSF(spectral correlation-signal subspace fitting)method to estimate DOA of coherent narrow band or wide-band signals,while the advantage of SC-SSF method still rematins.

提要 本文提出一种修正的SC-SSF方法。该方法适用于宽带和窄带源，不仅可解决循环相关源的问题，而且具有更好的噪声抑制特性。

Systematic aerobic exercise upregulates expression of enzyme genes concerning tricarboxylic acid cycle, and downregulates expression of genes concerning muscle protein synthesis and sphingolipid. It is suggested that aerobic exercise is good to protect human nerves' integrity, exerts positive action on anti-aging and accelerate the aerobic metabolism of lipid materials in vivo.

有氧运动可使三羧酸循环相关酶基因表达上调，肌肉蛋白合成相关基因和神经鞘脂类相关基因表达下调，提示有氧运动有助于保护神经细胞的完整性，对抗衰老有积极作用，同时可加速体内脂类物质有氧代谢。

The problem of detecting the complex linear frequency modulation in multi- path based on cyclic correlation is discussed.

针对复线性调频信号在多径条件下的循环相关检测问题进行研究。

Array privatization is one of the most effective loop transformations for the exploitation of parallelism. This transformation technique privatizes arrays according to the information of the data dependence analysis, which eliminates the memory-related dependences, i.e. anti and output dependences, to make the loop execute parallel.

数组私有化是开发并行性最有效的循环变换技术之一，它以数据依赖关系分析为依据对数组进行私有化，消除循环中的存储关联数据相关，即反相关和输出相关，使循环可以并行执行。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。