band spread 中文意思是什麼

band spread 解釋
波帶擴展，波段擴散，頻帶擴展，頻段擴展
  • band : n 1 帶，繩；帶形物；箍；箍條；嵌條；鑲邊；鋸條； 〈pl 〉 （法官等的）寬領帶。2 束縛，羈絆；義務；...
  • spread : vt （spread）1 伸開，伸長（手臂等），展開，張開（帆等），打開（地圖等）；鋪開（氈子等），展寬，展...
  1. A novel communication receiver which uses lapped transform ( lt ) incorporating modified median filter ( mmf ) algorithm is designed for narrow - band interference excision. the lt domain mmf algorithm takes full advantages of the direct sequence spread spectrum signal, as well as the characteristics of lt, performing the transform domain filtering twice. the first filtering locates the position of interference and mitigates most of them. the second filtering is performed in a small neighborhood of the located interference. so lt domain mmf algorithm can completely mitigate the interference without distorting the desired signal. simulation results demonstrate the improved ber performance and increased robustness of our receiver

    本文採用改進的重疊變換域中值濾波演算法進行變換域抗干擾處理.該演算法既考慮到直接序列擴頻信號的特點，同時又利用重疊變換的特性對變換域系數進行了二次濾波.該演算法節省處理時間，並且不需要有關干擾的先驗知識，系統性能不會隨干擾頻率變化而變化，因而是一種很穩健的處理方法
  2. Immanent factors forming subtle trap is many times spread of lake water body. many large land - carriage clastic system provide large deposit space. ancient heave slope band controls distributing of subtle trap

    湖盆水體多次擴展是隱蔽油氣藏形成的內在因素；多處大型陸源碎屑體系為隱蔽油氣藏的形成提供了廣闊的儲集空間；古隆起斜坡帶控制隱蔽油氣藏的分佈。
  3. 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線的傳輸特性和數字調制技術進行分析的基礎上，將通信理論中的直接序列擴頻技術（ dsss ）用於解決低壓電力線通信的干擾問題，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，構造出低壓電力線載波通信系統，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。
  4. According to the latest hong kong a " next magazine " reported that he grieved his wife premarital liar, intend to divorce at this time, not to mention a band to bolaopo son yudanjufen and second to spread salt to the wound, a condemned by the ruthless men

    據最新一期香港《壹周刊》報道，他痛心老婆婚前說謊，打算離婚，此時不提，一來怕老婆帶兒子玉石俱焚，二來不願傷口撒鹽，成為千夫所指的無情男。
  5. When signals pass high power amplifier, they would be distorted in amplitude and phase, leading to spectrum spread and distortion of in - band signals, both of which would weaken performance of the whole system in turn

    在無線通信中，信號在通過高功率放大器時會產生幅度和相位失真，造成頻譜擴展以及帶內信號畸變，導致整個系統性能的降低。
  6. For 14 years, tom lee music and carlsberg have created a new wave of popular culture in hong kong with the quintessential carlsberg pop music festival. started in 1985 with the aim of promoting original band sound and providing opportunity for young musicians to express their talents, the carlsberg pop music festival had drawn overwhelming response from local musicians and wide - spread support from the music industry. through the years, the competition has not only recognized the amazing talents of local musicians but also cultivated a spirit of originality in the local popular music scene

    自一九八五年起，通利琴行與嘉士伯本著推廣本地原創音樂，及發掘樂壇新音樂組合的目標， ?手舉辦了別開生面的嘉士伯流行音樂節。十四年來，這個集本地樂隊同臺砌磋的比賽，已成為香港樂壇一年一度的盛事之一（ 1985 - 1998 ） 。
  7. Aiming at the problem of intercepting the direct sequence spread spectrum communication signal, this paper makes full use of the wave characteristic of base - band signal after it is applied to shaping filter is made, and an algorithm which is based on the average power serial is given

    摘要針對直接序列擴頻通信信號的偵察問題，充分利用擴頻基帶信號發送成型濾波后的波形特點，提出了一種基於最大平均功率序列的演算法。
  8. 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。
  9. Band spread tuning

    頻帶展開調諧
  10. Band spread system enables you to easily tune in sw stations

    波段擴展系統，可讓您較容易調諧sw電臺。
  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

    寬帶碼分復用無線傳輸系統是採用直接序列擴頻/碼分多址（ dsss / cdma ）技術，在20mhz頻帶內實現四路2 . 048mbps的e1鏈路數據速率的無線傳輸。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. Supposing chaotic ds - spread spectrum signal bandwidth is equal to the fh slot spacing, the bit error rate formula is derived, and its performance is evaluated and simulated assuming the worst case of jamming strategy. the results show that, in some cases, the addition of chaotic ds spreading to fh system, without increasing total system bandwidth, can improve significantly the system ' s resistance to partial band multitone jamming

    對最惡劣條件下系統的抗干擾性能進行了模擬研究，結果表明，在某些情況下，在慢跳頻系統中，加入混飩直擴成分，即使不增加系統帶寬也能有效地改善系統對抗部分頻帶多頻干擾的能力。
  13. This system realizes the underwater distance mobile security communication. the only shortage is the low velocity, which is result from the speciality of underwater channel and that spread spectrum need big frequency band

    採用這一技術的水聲通信實驗系統成功的進行了湖上試驗，這種技術的不足是通信速率較低，這是由於水聲通道的特殊性以及擴頻技術要佔用大量帶寬所致。
  14. The spread spectrum ( ss ) communication system has stronger ability of resisting jamming, narrow band, and multipath interference than that of the conservation communication systems

    擴頻通信系統與常規的通信系統相比，具有很強的抗人為干擾，抗窄帶干擾，抗多徑干擾的能力。
  15. As time drew close to the registration deadline, the news further spread to the schools and in just two weeks, the team was augmented by nearly twenty school children, enough to form another band for the school orchestra competition category

    組團消息很快傳到學校，在截止報名前兩星期內，竟增添了近二十位學生，足夠組成另一支學生樂隊。
  16. The hardware design includes pl2101 power line node, realization of narrow - band interferences in direct sequence spread spectrum signal using frequency - domain algorithm

    其中硬體設計包括pl2101電力線節點、窄帶干擾自適應抑制系統的實現。
  17. Simulation results demonstrate theoretical derivation is correct and both sequences can be used in communication. based on the presented ds / sfh communication scheme, and employing msk as fh spread spectrum modulation, the performance is studied n the presence of partial band multitone jamming and additive white gaussian noise ( awgn )

    根據所提出的混合ds sfh擴頻通信系統方案，採用msk相干調制，在假設直接序列擴頻后信號帶寬等於跳頻間隔的情況下，推導了系統在部分頻帶多頻干擾和加性白噪聲下的誤比特率公式。
  18. In this paper, a complete scheme is proposed for el wireless spread spectrum modem in tdd mode. firstly, it discusses tdd protocols and base band module. secondly, with in - depth ananysis on hfa3860b and its high speed spread spectrum technology ( mbok ), we incorporates the chip for continuous and transparent transmission of el data successfully

    論文在對hfa3860b進行深入研究的基礎上，對晶元所採用的高速擴頻技術? mbok擴頻技術進行了理論探討，並成功地將其用於e1數據的無線擴頻透明傳輸，實現了系統要求，並且拓寬了晶元的應用范圍。
  19. The application of saw in spread spectrum communication was studied. 2. the direct band - pass sampling on the intermediate frequency despread and demodulation algorithm of ds / d8psk signal was investigated, a new despread and

    2 .詳細研究了ds / d8psk信號的中頻直接帶通采樣解擴解調演算法，提出了適合於ds / d8psk信號的優化的通用解擴解調演算法。
  20. The mystic ramakrishna, who was a devotee at a temple of kali called daksinesvar to the north of calcutta, attracted a band of educated lay followers who spread his doctrines

    神秘家羅摩克里希那，是加爾各答北部達克希什瓦卡利神廟的一個奉獻者，吸引了一群受過教育的世俗追隨者來傳播他的教導。
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