隨機衰落 的英文怎麼說
中文拼音 [suíjīshuāilà]
隨機衰落
英文
random fading-
Although this particular factor is speculative, and not generally accepted, the decline of the ivc, as with any other civilization, will have been due to a combination of a variety of reasons
盡管這種獨特的因素是隨機的，並沒有得到普遍的接受，可是印度河流域文明的衰落，跟其他任何文明一樣，是由於各種不同的綜合因素所造成的。In this thesis we analyze in detail the influence, created by random change of the optical wave polarization, on the output of the interferometer. then several principles of eliminating polarization - induced fading are introduced, and the principle that inserting two faraday rotator mirrors into the end of michelson fiber interferometer to eliminate the fading is analyzed in detail. this method can eliminate polarization - induced fading without additional signal processing, and make the output of the sensor stable
其中，本文詳細分析了光波偏振態的隨機漂移對干涉儀輸出的影響，介紹了目前幾種消偏振衰落技術的原理，著重討論了在光纖michelson干涉儀末端加兩個法拉第旋轉鏡的消偏振衰落的原理，該方法不需要任何附加的信號處理就可以消除偏振衰落，使干涉儀輸出穩定。Gradually, with the more and more transpiration of the vegetation, and with the reduction of the deep soil moisture, in the end, a kind of balance of soil moisture will appeared and be kept for ever between the precipitation and the transpiration of vegetation, and the manual sand - fixing vegetation will be transformed consequently into its natural climax stage completely, in which the dominant plant is leymus secalimus, and in which the plant species richness is not too low, but the plant species evenness is the lowest
設置機械沙障和生物沙障的初期，植物的物種豐富度、物種均勻度會有一個暫時的提高；但是在人工固沙植被的發育盛期，物種豐富度會降低；隨植物群落蒸騰耗水量的不斷增大，人工植被不斷地衰退，最後發展到賴草土壤頂極群落，此時的物種豐富度並不低，但是物種均勻度很低。Second, this paper design the simulation scheme of bicm for comparing the performance over fading channel and awgn channel that combine 2 / 3 rate, 4 states punctured convolutional code with 8psk modulation, matching block interleave or random interleave, transform through rayleigh channel or awgn channel and use the way that combine coherent demodulation with viterbi decoding in receiver. design the scheme of bicm _ id that use the iterative decoding technique and the scheme of tcm for compare
為了驗證bicm和bicm _ id在衰落通道和加性高斯白噪聲通道（ awgn ）下的性能，設計了一個2 / 3碼率， 4狀態的鑿孔卷積碼經過塊交織或隨機交織，與8psk調制相結合，在rayleigh通道下或awgn通道下傳輸，接收端採用相干解調與維特比譯碼相結合的bicm方案，在接收端引入迭代反饋譯碼的bicm _ id方案，以及與之相比較的tcm方案。However, affected by the change of economy, political situation and the growth up of new financial setup, pawnbroking of sichuan had been declining
但是，隨著經濟的發展、政局的變化及新式金融機構崛起等因素的影響，典當業逐步走向衰落。Civil air defense alarm system was a system to dispense antiaircraft alarm sig - nal, hand hostile air attack informational communication to urbanite at wartime. it is a particular informational communication system of the civil air defense depart - ment, and can not be taken place. at the development trend of digitaliza - tion, unitization, integration of civil air defense communication, the civil air defense alarm system is developing too, for adaptation to the require of both future war and peaceful dual, and enhancing civil air defense communication system ' s directing automation. in recent years, development of different kinds of communication technology infuses new clearly energy into communication, especially spread spectrum communication, because of its strongly interference - free feature, invisibility best, realizable code division multiple access and antimultipath wane and so on merit, gets extensive use at wireless region ; the corresponding spread spectrum chips emerge as the times and get boom, which provides advantag e to realization of the circuit of spread spectrum communication. at the same time, in company with the advance of electronics level, the single chip microcomputer has a great development, world renowned chip manufacturer pushout respective products one after another, the kinds of which are too many to statiste
在人防通信的數字化、一體化、綜合化必然的發展趨勢下，人防警報系統也不斷發展，以適應未來戰爭和和平時期的雙重需要，提高人防通信系統指揮自動化。近年來，各種通信技術的發展給通信注入了活力，擴頻通信更因其抗干擾能力強、隱蔽性好、可實現碼分多址和抗多徑衰落等優點在無線領域得到了廣泛應用；其相應擴頻處理晶元應運而生並得到迅速發展，這為擴頻通信的電路實現提供便利。同時隨著微電子工藝水平的提高，單片微型計算機有了飛躍發展，世界上著名的集成電路晶元製造商紛紛推出各自的產品，單片機型號之多，已達到難以統計的地步。Multibeam base - station smart antennas are discussed in this paper. we analyze the outage probability of mobile communication system suffering both fast fading and shadowing by means of statistical propagation model, and contrast the case that adopt multibeam smart antennas to the case that adopt omnicase. the results emulated by computer show that the outage probability of mobile communication system will diminish as the increasing of the number of beams using smart antennas no matter when suffering a single co - channel interfence or six ones
研究了移動通信環境下的多波束智能天線，並基於統計傳播的同通道干擾模型，分析了快衰落及慢衰落情況下未採用多波束智能天線與採用多波束智能天線時的中斷率，並進行了比較.計算機模擬結果表明：採用多波束智能天線，不論在單個同通道小區還是多個同通道小區情況下，系統的中斷率將隨著波束數的增大而降低The relative motion between the base station and the mobile results in random frequency modulation due to different doppler shifts on each of the multi - path components, also called time selective fading
由於基站與移動臺之間的相對運動，每條路徑都會有一個明顯的多普勒頻移，導致通道的隨機頻率調制，也稱時間選擇性衰落。For power control of listening users, forward power control method are introduced based on full, multichannel, filtered report, and collision method etc. the full report method has redundancy report information, and its real - time performance is bad, multichannel report is introduced to improve the real - time performance, and filtered report is introduced to eliminate the redundancy information, finally the collision method introduced can not only get higher real - time performance but also diminish the redundancy information ; 2. in order to meet the requirements of making the dynamic simulation of trunking group system, the ms ’ s random move equation is brought forward, the simulation of ms ’ s distribution is done and the integrated channel model are presented ; 3. the smart predicative model of power control is introduced to overcome the delay and track the change of the complicated network, with this model, the power control ‘ s performance is greatly improved
全匯報方法存在冗餘的匯報信息，而且實時性較差，為了改善實時性提出了多通道的匯報方式，為了改善冗餘匯報而提出了篩選法，最後介紹的碰撞法在減少冗餘信息的同時又提高了實時性;二、為了集群功率控制動態模擬的需要，提出了移動臺的隨機運動方程，進行了有關移動臺的分佈模擬，建立了綜合的通道模型;三、希望克服延時和跟蹤復雜網路環境變化，提出了功率控制的智能預測模型，通過智能預測模型可以改善功率控制的性能，著重介紹了採用神經網路的方法實現智能預測的通用模型，從而跟蹤復雜多變的無線環境，諸如慢衰落及快衰落（包括多徑衰落、多普勒效應所引起的衰落）等網路特徵，達到預測功率需求;四、採用二級正交碼和智能天線（空分多址）的方法進行組內用戶的識別，改進功率控制效果;五、話權用戶的前向和反向功率控制方法;六、對引入gota的cdma系統提出了復合容量表示方法，並作容量分析，探討有關gota系統的qos問題。分享友人