Design and simulations of an enhanced fm - dcsk system based on woven codes 系统在衰落信道下的性能分析
Performance of wireless multimedia ds - cdma diversity receiver in fading channel 无线多媒体直扩分集系统在衰落信道下的性能研究
The closed - form expressions of the detection and false - alarm probabilities and mean acquisition time are derived for the hybrid acquisition scheme with two fixed threshold 本文分析了在多址干扰下,在衰落信道中,基于相关器解扩的串并混合双dwell固定门限检测方案的性能。
2 it is so hard to think of this nation in decline when you know that there are vast regions of the planet which are absolutely paralyzed , incapable of any improvement at all 如果你知道世界上有广大地区完全处于瘫痪状态,无法取得任何进步时,那就难以想象这个国家在衰落。
Through sight and thinking of modem intellectual returning to native place , orchard city stories told of some stories and people about orchard city when it have been come downing 摘要《果园城记》是通过一个还乡的知识者( “我” )的所见、所闻、所感,写出了小城在衰落过程中出现的人、景、物、事。
Today , most people realize the importance of protecting the ancient residence , but the old housing has being declining . on the other hand , local residents are building the new residence passionfully 在保护古民居意识不断提高的今天,一边大部分老房子一直在衰落,一边建设新居高潮不断,当地的居民似乎不在乎传统。
Coded modulation technique is a way that combines coding technique with modulation technique to get coding gain in the instance of keeping the power efficiency and frequency efficiency but increasing the complexity of equipment 解决这一问题的一种有效方法是利用交织技术与编码调制相结合,以此获得在衰落信道下性能的提高。
This thesis first studied the communication system with detailed theories so that to choose the appropriate method of modulation and demodulation . n / 4dqpsk is a kind of modulation method which is appropriate to transfer in the attenuated channel / 4dqpsk是一种比较适合在衰落信道中传输的调制方式,它不需要提取相干载波,因而不存在相位模糊、环路跳周等问题。
With criterion of minimized average energy and criterion of maximized minimum euclidean distance as the basic policies , we determined the optimization mechanism of star - qam constellation in ofdm system with fading channel and using quasi - coherentand demodulation 我们以平均能量最小以及最小欧氏距离最大为原则,确定了在衰落信道下ofdm系统中采用准相干解调时,星型qam调制星座图优化的方法。
Abstract : in this paper , an orthogonal multicode wideband cdma system modelincluding pilot channel based on chaos spreading sequences is given . based on chaos sequences , with pilot channel inserted orthogonally , it is shown that the performance of the system is improved . the performance of the system in fading channel is analyzed 文摘:提出一种基于混沌序列含导频信号的宽带正交多码cdma系统模型,利用混沌序列以及采用正交插入导频信号提高系统性能,并对此模型在衰落信道中的性能进行分析。