直線序列 的英文怎麼說

中文拼音 [zhíxiànliè]
直線序列 英文
linear order
  • : Ⅰ形容詞1 (成直線的; 硬挺的) straight; stiff 2 (跟地面垂直的; 從上到下的; 從前到后的) erect; v...
  • : 名詞1 (用絲、棉、金屬等製成的細長的東西) thread; string; wire 2 [數學] (一個點任意移動所構成的...
  • : Ⅰ動1 (排列) arrange; form a line; line up 2 (安排到某類事物之中) list; enter in a list Ⅱ名詞1...
  • 直線 : 1. (不彎曲的線) straight line2. (急劇的) steep; sharp
  1. Finally, with the optimized chaos sequences, the results of software simulation on vhf - rc indicates that ds - ss outbalances the bpsk system without spread spectrum due to ber and the ds - ss with kent sequence is better than the one with golden sequence in some extend

    最後本文對數字混沌進行了優選,在超短波中繼通道模型上的模擬結果表明混沌擴通信相比于非擴頻的bpsk通信在誤碼率方面明顯較低;相對于性擴頻碼( gold) ,同樣誤碼率較低。
  2. According to the theoretical parameters and analysis of clustering identification of noises, and based on the theory of spread frequency communication and bpsk, the remote reading meter system through medium - voltage power line is realized

    根據理論參數及噪聲分類識別分析,以擴頻通信為理論基礎,採用bpsk調制解調,設計了基於中壓電力的遠程抄表系統。
  3. The percentage of polymorphic sites, degree of genetic polymorphism and genetic distance were compared and the phylogenetic tree was constructed by neighbor - joining method. the partial mitochondrial 16s rrna gene was amplified by polymerase chain reaction ( pcr ) and the pcr products were directly sequenced after purified. these sequences, together with the homologous sequences of another trichiuridae species lepidopus caudatus obtained from genbank were used to analyze nucleotide difference and to establish a upgma phylogenetic tree by means of biological informatics

    汝us價ay1830 )各12個個體進行rapd分析,對比多態位點比例、遺傳多態度以及遺傳距離,並構建neighbor - join噸系統樹;通過pcr擴增出粒體165rrna基因,純化后接測,利用生物信息學方法進行分析和核昔酸變異比較,結合ge紅bar止中大西洋叉尾帶魚( lepid (護腳caud玫tuseuphrasen1788 )同源構建u甲cm叭系統樹。
  4. This paper mainly focuses on the noise limiting by means of the direct sequence spread spectrum ( dsss ) and the analysis of the transmission performance of the plc and some digital modulation technology. the contents of the paper is as follows : 1 ) the technical feasibility is proved after simulating noise limiting principle of dsss by means of systemview, the simulation software ; 2 ) a kind of band pass filter ( bpf ) is realized according to the requirement of filter and the principle of butterworth approximation, which satisfies the index of performance of dsss. 3 ) the low voltage plc system includes the sc1128, the specific modulation / demodulation ic, the bpf filter and other circuit components, furthermore, the control function of system is realized by means of the personal computer and the microcontroller

    本課題在對低壓電力的傳輸特性和數字調制技術進行分析的基礎上,將通信理論中的擴頻技術( dsss )用於解決低壓電力通信的干擾問題,主要研究內容如下: ( 1 )用通信模擬軟體systemview對dsss技術的通信和抗干擾原理進行模擬分析,分別對時域和頻域下採用dsss技術前後接收信號的頻譜進行分析,驗證dsss技術在本系統中的可行性; ( 2 )由dsss技術對濾波系統的要求,根據濾波理論分析了巴特沃思型濾波器的逼近原理並設計了合適的濾波電路; ( 3 )用調制解調晶元sc1128和自行設計的濾波器加之輔助外圍電路,構造出低壓電力載波通信系統,並採用atmel公司的單片機設計了接收和發射電路的微控制器; ( 4 )分別對採取抗干擾措施前後輸入和輸出信號進行對比實驗,並對結果進行分析,驗證了dsss技術對干擾信號的抑制作用。
  5. Spread spectrum communication technology can be classified into four catalogs : direct sequence spread spectrum, frequency hopping, time hopping and chirp

    擴頻技術種類較多,主要包括擴頻、跳頻、跳時和性調頻。
  6. This paper designs an in - building power line dsss communication system after analyzing the properties of power line channel in detail

    本文在對電力通道特徵詳細分析的基礎上,設計了室內電力擴展頻譜通信系統。
  7. A remote record system is designed using integrated circuit based on direct sequence spread spectrum carrier communication technology and can transfer data from the sender to the receiver via low voltage power line

    本文應用擴頻晶元設計了一種遠程抄表系統,它採用擴展頻譜通信技術,以低壓電力作為媒介進行通信。
  8. In the text, direct sequence spread spectrum signal ( dsss signal ) is the main object, and some nonlinear methods based on chaotic theory, used in the prediction of signal and detection of signal is studied

    本文以保密通信中廣泛使用的擴展頻譜信號( dsss信號)為主要對象,研究了一些基於混沌理論的非性的方法在信號預測和信號檢測中的應用。
  9. An in - building power line data communication system is built using dsss and qpsk technology and its important parameters are presented

    使用擴頻及qpsk等通信技術構建了室內電力通信系統,給出了主要的技術指標。
  10. A performance analysis of wireless lan protocols

    11無局域網協議的擴頻技術
  11. The technology of direct sequence spread spectrum / code division multipul access ( dsss / cdma ) are applied in the broadband code division multiplex wireless communication systems, which means transmitting data at the rate of 2. 048mbps using four e1 lines within the band of 20mhz. in this paper, the theory of the whole debice is first analysized specified for the system asic design and optimizing its performance

    寬帶碼分復用無傳輸系統是採用擴頻/碼分多址( dsss / cdma )技術,在20mhz頻帶內實現四路2 . 048mbps的e1鏈路數據速率的無傳輸。本文首先分析了整個數傳設備實現原理,針對系統asic設計和優化整機集成性能出發,提出並實現了基於fpga控制pm4314e1晶元的介面模塊完成對e1鏈路信號的監控和告警功能的改進方案。
  12. In the second part, the new method is compared with the old one in such aspects as system structure and signal processing methods. in the third part, the properties of dsss and lfm systems, especially the echo signal correlation processing of the systems are discussed. the last part are the respective analyses of water - pipe simulation experiment results and the trial results in zhong yuan oil field

    本文首先介紹了超聲測距的基本原理,分析了通道的聲傳輸特性;接著將傳統液位測量方法和新型液位測量方法的系統構成和信號分析處理方法做比較;然後對系統的發射信號(擴頻信號和性調頻信號)的特點進行了研究,並著重討論了回波信號的相關處理;最後對水管模擬實驗測量結果和油田實地測量結果分別進行了分析和討論。
  13. A nonlinear adaptive filtering fast algorithm for narrow - band interference suppression in dsss systems

    擴頻系統中強窄帶干擾抑制的一種非性自適應抑制快速演算法
  14. We designed a wireless asymmetric physical layer link model with a direct sequence spread spectrum system as a transmitted reference. uplink and downlink are both one - way links connected by an ip tunneling. uplink is consisted with the narrowband radio data link of the warfighter information networks ( win )

    研究了無非對稱鏈路,提出了一種用參考法擴頻( dsss )實現的無非對稱數據傳輸的物理層鏈路模型:利用現有戰斗員信息網電臺的窄帶數據鏈作為上行通道,通過ip隧道技術保證單向鏈路的連通性。
  15. With the downlink simulation model constructed, performance of wideband cdma under different radio propagation environment and vehicular speed is simulated. based on system model of mc ds cdma under flat fading channel with relative shifts of spreading sequences within 1 chip and frequency selective fading channel with arbitrary relative chip shifts, performance of multicarrier cdma system with go sequences under different radio environment is investigated

    基於多載波碼分多址在乎坦衰落通道中偏移小於1個碼片及在頻率選擇性衰落通道中偏移任意個碼片的系統模型,本文還分析了採用廣義正交的多載波碼分多址系統在不同無傳播環境下的性能。
  16. The communication technology of electric automatic system is discussed. it principally studies the technology of organizing nets, the communication technology of low pressure electric line and the technology of spread spectrum communication. it gives the project that power line carrier and direct sequence spread spectrum communication are combined with automatic dial - up passing modems for daqing automatic reading meter system

    探討了電力自動抄表系統的通信技術,重點研究了組網技術,低壓電力通信技術,擴頻通信技術,提出了在大慶電力自動抄表系統中利用公眾電話網通過數據機自動撥號、電力載波和無擴頻通信相結合的數據傳輸方案。
  17. Recently spread spectrum technique has been used widely in wireless data communication, cellular mobile communication, military communication and telemetry monitor system with resistance to interference, high usage of spectrum, resistance to multi - path fading, so investigators in communications field pay more attention to the technique, especially direct sequence spread spectrum ( dsss ) technique

    近年來,擴頻技術以其抗干擾能力強、頻譜利用率高、抗多徑等優越性能在無數據通信、蜂窩移動通信、軍事通信以及遙測監控系統中獲得了廣泛的應用,並日益受到通信領域研究人員的重視,特別是擴頻技術( dsss ) 。
  18. Multicarrier wireless communications have been widely investigated in the past decades. recently, two - dimensional spread spectrum ( 2d - ss ) system has drawn a lot of attention because of its full utilization of spreading characteristics in the frequency domain and time domain. compared with multicarrier code division multiplex access ( mc - cdma ), 2d - ss system can effectively mitigate multiple access interference ( mai ) due to spreading in the time domain

    當前多載波無通信技術得到了廣泛的研究,二維擴頻通信系統是近年來提出的新的擴頻通信方式,由於二維擴頻系統從時域和頻域上分別對數據信號進行頻譜擴展,因此它同時具有時域擴頻和頻率擴頻通信系統的特點,是對傳統的一維時域擴頻和多載波擴頻的推廣。
  19. A concatenated sequence of straight lines

    連接起來的直線序列
  20. Certain methods flatten a path, which means that all the curves in the path are converted to sequences of lines

    某些方法展平一個路徑,這意味著該路徑中的所有曲都被轉換為直線序列
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