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本文首先介绍了跳频通信的原理,然后简要介绍了目前对跳频通信系统的干扰所采用的方法和性能度量指标,对几种典型干扰样式的干扰性能进行了详细的理论分析,推导出了不同条件下的误码率计算公式. 相似文献
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在一般跳频系统中,跳频序列是由递归算法产生的,如PN序列以及混沌序列、模糊序列等。本文介绍的基于时钟和地址的跳频序列提供了一种新的产生方法。这种序列是由长比特设备地址和不断变化的长比特时钟信息经过一系列运算而产生的,即基于时钟和地址和跳频序列,该序列具有理想的均匀频谱特性和很长的周期;序列线性跨距很长,不容易被智能干扰机干扰;序列的汉明相关特性也很好;这个特点在多址接入通信中非常有用。该序列另一个重要特征是硬件实现简单容易,事实上,这种序列巳成功应用于蓝牙跳频系统中。本文主要介绍这种跳频序列的设计产生过程,并对序列的各种性能进行分析。 相似文献
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分析了跳频通信电台共址干扰的形成原因以及共址干扰对跳频通信的影响,提出了解决跳
频通信共址干扰的技术措施,为解决机载平台或车载平台配置多部跳频电台时的电磁兼容
问题提供了参考。 相似文献
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介绍了跳频通信原理及跳频通信具有的特点,并重点论述了跳频图案的设计、同步技术、频率合成技术、跳频组网及自适应跳频等跳频通信中的关键技术,总结了跳频技术的应用,分析了跳频技术的发展趋势. 相似文献
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基于当前短波差分跳频研究的现状及其基本原理,较全面地讨论了短波差分跳频中有关系统及技术问题,分析了差分跳频的优势和不足及其与传统跳频的不同点,得出了一些有益的结论。 相似文献
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《中国对外贸易(英文版)》2008,(12):14-15
As the two traditional markets for China's tex- tile and clothing exports, the U.S. and Europe have recently shown a huge contrast. 相似文献
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《中国对外贸易(英文版)》2008,(12):16-17
In November of 2005, China and the U.S. signed a bilateral agreement on textiles, launching the three-year quota control for 21 sorts of textile products. In 2007, the second year for the implementation of the agreement, China's textile export to the U.S. underwent several changes. 相似文献
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《中国对外贸易(英文版)》2008,(5):50-51
The overall strategic relationship between U.K. and China is "better than ever", China- Britain relations have maintained good momentum, with increased high-level exchanges and the reinforcement of strategic mutual trust, with more room for growth in the future. 相似文献
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《中国对外贸易(英文版)》2008,(6):59
On February 29th.the 6th China.ASEAN Business Council meeting was held in Beijing.Some 50 deputies attended the meeting,including top officialsCCPITVPYuPing andthe president of the ASEAN Chamber of Commerce and Industry,as well as business and industrial representatives from Thailand,Myanmar,the Philippines and Singapore.Also present at the meeting were representatives from the Secretariat in China of the China-ASEAN Business Council,the Guangxi Branch of the CCPIT,as well as industrial branches and media. 相似文献
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《中国对外贸易(英文版)》2008,(14)
Beijing Badaling Development Area The Development Area is planned to cover an area of 6.56 km~2. Currently,more than 300 enterprises have located in the area. Their investments add up to about RMB 1 billion.Major busi- ness trades include machine building,mineral ore processing,medicine, electronic parts,foodstuffprocessing,and warehousing transportation. The Development Area has completed the construction of neces- sary infrastructural facilities. 相似文献
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Charlie Xiao Feng 《中国对外贸易(英文版)》2008,(7)
The U.S.in the last couple of years has been up in arms about China's exchange rate regime. In 1994 China established a de facto currency peg.The dollar-RMB ex- change rate was fixed at 8.28.The People's Bank of China(PBC)al- lowed the rate a narrow band of around .01 to.02 percent in which it could shift daily.The exchange rate program did not become newsworthy until U.S.Treasury Secretary John Snow's visit in 2003.In fact as a study by Frankel and Wei(2007) showed,the RMB's forward was actually selling at a discount against the dollar prior to Secretary Snow's visit to China 相似文献
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Dialogue between China U.S.is various in channels among which Sino-U.S.Strategic Economic Dialogue paves way for a smoothly-going long-term cooperation in bilateral relations.The dialogue focuses on bilateal global strategic economic issues of common interests concerns.…… 《中国对外贸易(英文版)》2008,(1):30-30
Dialogue between China and U.S. is various in channels, among which Sino-U.S. Strategir,Economic Dialogue paves way for a smoothly-going and long-term cooperation in bilateral relations.The dialogue focuses on bilateral and global strategic economic issues of common interests and concerns. 相似文献
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Guo Yan 《中国对外贸易(英文版)》2008,(12):62-63
Looking at the increasingly fierce competition in the world auto market. global automobile manufacturing industry, taking Europe, the U.S. and Japan as representatives, is gradually forming a new type of relationship, mutual cooperation between whole vehicle and parts manufacturers. We can clearly see that auto parts manufacturers have become independent from the whole vehicle manufacturing companies, which means that the former structure of auto industry has greatly changed, and a new relationship, 相似文献
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The long expected Lan-Blisslivinghome Global Home Design Contest announced the winners on April in Beijing.Young designers Wang Yingying from Beijing Qiang Xiaoning from Shanxi stood out from the crowd won the first second prize respectively.Malgorzata Czuchraj from Poland ranks the third.On the awarding ceremony Blisslivinghome presented its autumn winter new arrivals.…… 《中国对外贸易(英文版)》2008,(10):43-43
The long expected Lan - Blisslivinghome Global Home Design Contest announced the winners on April 17 in Beijing. Young designers, Wang Yingying from Beijing and Qiang Xiaoning from Shanxi stood out from the crowd and won the first and second prize respectively, Malgorzata Czuchraj from Poland ranks the third, On the awarding ceremony, Blisslivinghome presented its autumn and winter new arrivals, 相似文献
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《中国对外贸易(英文版)》2008,(6)
"Crucial for economic growth.energy utilization has its role in all economic sectors and every aspect of people's daily life.Now we are in dire need of a new profession,namely energy manager.We not only need to have passion and responsibility,but also a scientific approach to conserve energy and cut emissions.APpropriate legislation should be in place.and a special profession should be introduced to ensure the implementation of these laws and regulations." 相似文献