直序擴頻 的英文怎麼說

中文拼音 [zhíxùkuòbīn]
直序擴頻 英文
direct-sequence spread spectrum ds/s/ss
  • 直 : 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...
  • 擴 : 動詞（擴大） expand; enlarge; extend
  • 頻 : Ⅰ形容詞（次數多） frequent Ⅱ副詞（屢次） frequently; repeatedly Ⅲ名詞1 [物理學] （物體每秒鐘振動...
  1. It was found that they were fit for the lpi applications. on the digital signal processing, we studied the demand on compute ability for fast acquest. we designed a new signal form named ds - fh - th signal which costs less in processing but without any lost on the lpi performance

    在信號的數字處理方面，分析了直接序列擴頻雷達在信號捕獲階段對計算能力的要求，在不降低系統lpi性能的基礎上，設計了ds - fh - th雷達信號，降低系統對計算能力的要求。
  2. Aiming at that spread sequence isn ’ t strict balanceable in the basic seds system, we set up three improved models, which can make the sequence balanceable. at the same time their ber performances are different

    本文針對基本自編碼直擴系統的擴頻序列無嚴格的0 / 1平衡特性，建立了三種都能達到擴頻序列平衡、但系統誤碼性能不同的改進模型。
  3. In this paper, research on the algorithm of complete digital if and baseband transmission system and the realization of transmitter and receiver. / 4 - dqpsk is chosen as digital modulation scheme. the scheme of demodulation is baseband differential detection. sliding correlator can realize the symbol synchronous acquisition ; early - late gate synchronizer is used to do symbol synchronous tracking

    系統的發射機選定/ 4 - dqpsk為調制方式，接收機採用基帶差分解調的非相干解調方式，滑動相關器捕獲發送的pn序列，早遲門同步器跟蹤符號同步，使用相關器對同步后的符號進行最佳判決，並在這些演算法實現的基礎上，實現了直接序列擴頻和解擴技術。
  4. 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序列進行了優選，在超短波中繼通道模型上的模擬結果表明混沌直擴通信相比于非擴頻的bpsk通信在誤碼率方面明顯較低；相對于線性擴頻碼（ gold序列） ，同樣誤碼率較低。
  5. Then studies a peculiar multi - carrier direct sequence spread spectrum ( mc - ds - cdma ) technology, analyzes the methods of processing multi - carrier signals and study the mathematical module of multi - carrier communication system receiver

    然後對本文所研究的這種特殊的多載波直接序列擴頻技術進行闡述，分析了多載波信號處理的方法和研究了多載波接收機的數學模型。
  6. The theory of direct sequence and cck is described. the mechanism of tdm is established. then, a method to maintain the synchronization of the tdm is proposed

    在介紹了ieee802 . 11協議的物理層用到的直序擴頻技術和補碼鍵控技術后，對系統的時分雙工工作機制的建立與維護進行了詳細的分析。
  7. Based on the analysis of vhf - rc, the method of applying chaos direct sequence spread spectrum communication ( cds - ssc ) to ahts has been studied and discussed in this thesis. in this method, cds - ssc, which combines chaos sequences ( cs ) of high rand quality with ds - ss excelling in resisting interferences, is used to realize the transmission of hydrologic data

    文中所述方法利用混沌直接擴頻通信的通信方式來實現水文數據的傳輸，即將隨機性能較強的混沌序列作為擴頻碼與抗干擾性較強的直接擴頻通信相結合，應用於水文自動測報系統中去。
  8. Secondly, this paper analyses data - delivering method, data - transmitting format and fault - control technology, studies and picks out direct sequence spread spectrum, accessing point network topology and the ieee802. 11b network rule, on the basis of which the harbor wireless communication system model is established. each composing part of the system ' s model is given out. the choice of hardware equipments and the design of communication software are expounded

    其次，本文對通信技術中的數據傳送方式、數據傳輸形式和差錯控制技術進行了分析，研究了港口無線通信系統中的傳輸方式、拓撲結構和網路標準等關鍵技術，選取直序擴頻傳輸方式、接入型拓撲結構和ieee802 . 11b網路標準作為港口無線通信系統的技術基礎，建立了港口無線通信系統模型，闡述了該模型的實現方法，包括硬體設備選擇和通信軟體設計。
  9. Principle and application of direct sequence spread spectrum asic

    直序擴頻晶元的原理與應用
  10. The results of the testing prove that the system compare with dsss takes great advantages over others on the aspects of the rate of transmitting data, its stabilization and its possibility of expanding

    測試結果表明，與直序擴頻系統相比， ofdm系統在數據傳輸速率、穩定性和可擴展性等方面具有十分明顯的優勢。
  11. The paper firstly analyses the fundamental principles of the direct sequence spread spectrum technique, the arithmetic in the frequency - domain by using the technology of the spectrum correlation adaptive filter

    本文首先就設計中選擇採用的直接序列擴頻技術、以及在頻域中實現直序擴頻信號中多窄帶干擾抑制的自適應演算法的基本原理做了分析。
  12. For dsss signals, we proposed two algorithms, one is a hypothesis test algorithm that can be used to detect if there are dsss signals, the other is a symbol period estimation algorithm using the cycle - stationary feature of dsss signals

    對直序擴頻（ dsss ）信號，本文提出了一種假設檢驗演算法檢測其存在性；利用dsss信號的循環平穩特性，提出了估計dsss信號符號周期的方法。
  13. Cck, dqpsk are concluded as the best spread spectrum / modulation techniques in wireless image communication systems. 1 imbps and 300 meter range can be obtained using orinoco wireless network card based on eee802. 11b wlans, which specifies cck, dbpsk, dqpsk techniques

    這種網卡採用直序擴頻和cck 、 dbpsk 、 dqpsk調制方式，工作在2 . 4ghz頻段，數據傳輸速率為11mbps ，傳輸距離最遠達300米。
  14. We analyzed the anti - jam and band inside anti - interfere performance of the system, and the low probability intercept ( lpi ) of the traditional direct sequence spread spectrum ( dsss ) modulations in the uav platform ' s applications. so a new modulation technique using a multi - level pseudo noise ( pn ) code has been presented. the new multi - level pn code is built from a high speed pn code through a low passed filter ( lpf )

    分析了系統抗阻塞式干擾和抗帶內頻帶干擾的性能，以及常規bpsk qpsk - dsss調制在無人機通信中存在的安全隱患，提出了一種用多電平pn碼進行擴頻調制的方法：採用高速pn碼，經過低通濾波器，產生多電平pn碼進行直序擴頻調制，能在低信噪比情況下有效抵抗平方率檢測器對系統載波的檢測。
  15. The selection of the pn sequence is very important because it influences the quality of the channel measurement directly. so it is discussed in this paper. because this system is a set of software radio, that is to say that the system is based on the pc platform and all other function is implemented by programming, so the selection of correlation fast algorithm, which is used in receiver frequently, is also very important

    本文對直序擴頻技術進行了系統地研究，對其中偽隨機碼的選擇直接影響到通道測量的質量的問題進行了討論，因為本系統是一套軟體無線電，即以pc機為平臺，其他的功能都由軟體編程完成，所以對信號接收中大量使用的相關的快速演算法的選擇也至關重要。
  16. In addition, hybrid spread - spectrum communication system is propitious to enhance anti - jamming performance of the system that is make up of direct sequence ( ds ) and frequency hopping ( fh ), and it can satisfy the require of anti - jamming of systems. it concentrate their virtue and overcome shortage in single spread spectrum style. this paper discusses the aspect in detail

    另外，將擴頻技術中應用最廣泛的兩項技術直序擴頻（ ds ）和跳頻（ fh ）結合在一起，構成混合擴頻通信系統，有利於提高系統的抗干擾性能，更能滿足系統抗干擾的要求，而且將跳頻系統和直擴系統的優點集中起來，克服了單一擴頻方式的不足。
  17. The next in order, according to the characteristics of nonlinear system, the generation methods were deeply studied

    本文研究的是用於直接擴頻的混沌數字序列，包括它的產生方法、特點和應用性能分析。
  18. Combining walsh sequence with direct spread spectrum sequence, we can construct hybrid ds - fh spread - spectrum communication mode. this is very important for the mode to have better performance on anti - multiple - access inference and anti - near - far inference

    將walsh函數序列與直接擴頻序列相結合構成的ds - fh混合擴頻通信方式對于系統抗多址干擾和遠近效應具有重要意義。
  19. To verify the performance of ds sequence, a kind of correlation detector is designed, and its ber formula is derived

    針對cne切snev直接擴頻序列，提出並設計了一種相關檢測方案，推導了該方案的誤碼率公式。
  20. Direct - sequence spread spectrum ( dsss ) takes a signal and " spreads " it over several frequencies, essentially creating redundant signals

    直接順序擴頻（ dsss ）取出信號，把它「散布」到幾個頻率上，實質上形成了冗餘的信號。
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