ffh

The Soft - decision and Erasure Decoding Method in FFH Systems

软判决与消去解码方法在快速跳频系统中的应用

FFH system is an important spread-spectrum system , which has excellent anti-interference capacity and causes great attention in the research field of military communication .

作为扩频通信体制中的一种重要类型，快速跳频系统因其出色的抗干扰、抗截获和抗人为阻塞能力，在当前军事通信研究领域引起广泛关注。

Research of Communication Technology Using FFH / DS Hybrid Spread Spectrum

FFH/DS混合扩频体制通信技术研究

A New ALE Calling Method In FFH / FSK System

短波快速跳频系统下新的ALE呼叫方法

FFT-based Detection of Existence of Synchronization Signal for FFH System

基于FFT的快速跳频同步信号存在性检测

Secondly , the multiple access interference problem in FFH / MFSK system is analyzed .

然后，分析了FFH/MFSK通信系统中存在的多址干扰问题。

Study on Anti-Jamming Performance of FFH / MFSK System

FFH/MFSK系统抗干扰性能研究

Impact of Fiber 's Dispersion on BER of FFH - OCDMA Systems

光纤色散对FFH-OCDMA系统误码率的影响

A Scheme for FFH / SS Communication Systems Efficiently Rejecting the Partial Band Jamming

快跳扩频通信系统中一种抗部分带宽干扰的方案

FH frequency synthesizer which is a key part of FFH system has a important influence on FFH performance .

跳频频率合成器作为高速跳频通信系统中不可缺少的一个关键部件，其性能的好坏对高速跳频系统的性能指标具有决定性影响。

The Detection of the Acid - resistant Gene ffh and Its Cloning in Cariogenic Bacteria

致龋菌中耐酸相关基因ffh的检测及克隆

The structure of a fast frequency hop ( FFH ) OCDMA system is introduced and the performance is analyzed by computer simulation .

介绍了光纤色散对快跳频光码分多址（FFH-OCDMA）系统结构，分析了系统性能并进行计算机仿真。

Conclusion : The acid-resistant gene ffh existed in Lactobacillus casei .

结论：干酪乳杆菌中存在耐酸相关基因ffh。

CONCLUSION : The homology of the acid-resistant gene ffh in cariogenic genus is high .

结论：各致龋菌耐酸相关基因ffh同源性高。

Synchronization Acquisition Using Early-Late Gate Based on Frequency-PN Sequence Double Pattern for FFH / BFSK Spread-Spectrum systems

FFH/BFSK系统的一种基于频率和PN序列双图案的早迟门同步捕获方法

Experiment shows that compared with traditional FFH OCDMA , SO-FFH OCDMA has much higher ( user ′ s ) data rate .

实验结果表明，相对于传统的快跳频光码分多址系统，码位重叠快跳频光码分多址可大大提高用户的数据速率。

We study modulation recognition of SFH system , FFH system and summarize the effective recognition methods and reduce the difficulty of identifying FH modulation signal .

针对调制方式为BFSK的慢跳系统和快跳系统，深入研究了调制识别的方法，利用不同系统的特征，总结了有效的识别方法，降低了跳频信号调制识别的难度。

Isolation and Identification of Lactobacillus casei from Rumen of a Young Cattle and Cloning of Its Acid-Resistant Gene ffh

犊牛瘤胃干酪乳杆菌分离鉴定及其耐酸相关基因ffh的克隆

OBJECTIVE : To detect the mutation of the acid-resistant gene ffh in the fluoride-resistant strain of Streptococcus mutans .

目的：检测变形链球菌耐氟菌株中耐酸相关基因ffh是否存在突变。

Effect of dispersion for non-cyclic one-coincidence sequence employing DCF was studied , and BER performance of FFH OCDMA system was analyzed .

分析了采用色散补偿光纤后非循环单重合码的色散效应，以及FFHOCDMA系统的误码率性能。

Meanwhile , synchronization is also the difficulty of the development of FH system , which needs supplicated design especially in the fast frequency hopping ( FFH ) .

同时跳频同步也是跳频通信系统开发的难点，特别在高跳速工作时实现同步捕获和跟踪需要精心设计方案。

Performance of FFH / BFSK AGC Receiver over a Nakagami-fading Channel with Partial-Band Jamming

FFH/BFSKAGC接收机在部分带干扰Nakagami衰落信道下的性能分析

These findings suggest that Ffh may be involved in the maintenance of a functional membrane protein composition during adaptation of Streptococcus . mutans to changing environmental conditions .

这些发现说明Ffh可能在变链菌适应变化的环境中，与维持细胞功能性膜蛋白质组成有关。

Stimulation of the OMN pool innervating the inferior rectus ( IR ) muscle activated FFH neurons antidromically .

在下直肌动眼运动神经元（IROMN）池中给予电刺激可使FFH神经元产生逆行兴奋。

FFH-OFDM combines fast frequency hopping ( FFH ) with regular OFDM symbols , and it shows better performance in anti-fading of time-varying multi-path .

快速跳频正交频分复用（FFH-OFDM）在常规的OFDM符号中加入快速跳频预编码矩阵（FFH），使其在多径时变的衰落环境下具有良好的抗衰落性能。

The results of simulation show that dispersion seriously reduces the peak power and sample energy on the FFH OCDMA system . Hence , bit error rate ( BER ) of system is increased by dispersion .

结果表明，在FFH-OCDMA系统中，光纤色散导致解码自相关光脉冲峰值功率和光脉冲取样能量的降低，进而导致系统误码率（BER）的增加。

The results show that for high speed FFH OCDMA system , the dispersion seriously reduces the peak power and sample energy . Hence , the signal noise ratio of receiver is affected by the dispersion .

研究表明，对于高速FFH-OCDMA系统，光纤的色散导致用户自相关输出峰值和取样切普内光能量的减小，进而降低了接收的信噪比。

CONCLUSION : There was mutation of acid-resistant gene ffh in the fluoride-resistant strain of Streptococcus mutans , and may be related to advance of the acid-resistant characteristic .

结论：变形链球菌耐氟菌株中耐酸相关基因ffh发生了突变，并可能与其耐酸性增强有关。

The scheme of dispersion-compensated fiber ( DCF ) and non-cyclic one-coincidence sequence was proposed to im-prove the BER performance of fast frequency-hopping optical CDMA system ( FFH OCDMA ) .

通过色散补偿光纤与非循环单重合码相结合，改善了快跳频光码分多址系统（FFHOCDMA）的误码率性能。

Nowadays the acid-resistant gene ffh is closely concerned by international researchers . The product of the gene is a kind of bioactive protein , which is the homologue of the 54-kDa subunit of the eukaryotic signal recognition particle .

目前耐酸相关基因ffh受到国内外学者的密切关注，该基因编码产物为一生物活性蛋白，是真核细胞中参与蛋白质易位的信号识别颗粒54kDa亚单位同系物。