頻譜效率 的英文怎麼說

中文拼音 [bīnpǔxiàolǜ]
頻譜效率 英文
spectral efficiency
  • 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...
  • 譜 : Ⅰ名詞[書面語]1 （按類別或系統編成的書或冊子等） table; chart; register 2 （指導練習的格式或圖形）...
  • 效 : Ⅰ名詞（效果; 功用） effect; efficiency; result Ⅱ動詞1 （仿效） imitate; follow the example of 2 ...
  • 率 : 率名詞（比值） rate; ratio; proportion
  • 頻譜 : frequency spectrum; frequency content; spectrum; power density spectrum; power spectrum; [系統] s...
  • 效率 : productiveness; efficiency; productivity; workpiece ratio
  1. Due to existing signal processing technology ’ s shortage such aslow measurement, narrow measurement range precision and other poor performance, we introduced a high - precise signal processing technology : firstly, to get power spectrum with hanning windowed welch modified periodogram, search its peak value frequency ; secondly, to apply zooming analysis via goertzel algorithm ; at last, to get a highly precise doppler frequency with energy centrobaric rectifying algorithm 。 the simulating result indicated that this technology introduced could get accurate doppler frequency 。 depending on above discussed technology, we designed a signal processing scheme, and developed a signal processing system. the running result showed high performance, verified the feasibility and reliability of the highly precise signal processing technology introduced. in a word, the technology improved ldv ’ s performance such as measurement precision, measurement range, dynamic response time 。 and it will have a wide application foreground

    針對存在的缺點，本文提出了一種應用於激光多普勒測速的高精度信號處理技術，即首先利用加hanning窗的welch修正周期圖演算法得到信號功率譜，搜索其譜峰值頻率，接著利用goertzel頻譜細化演算法對搜索的譜峰進行細化分析，再引入能量重心頻譜校正演算法對細化后的譜峰進行校正分析，從而將離散頻譜分析演算法、頻譜細化演算法和頻譜校正演算法三者有機結合起來，充分發揮各自的優點:通過加hanning窗的welch修正周期圖演算法快速得到功率譜及峰值頻率，通過goertzel演算法獲得分析頻帶的高解析度頻譜，然後通過能量重心校正演算法對細化后的頻譜進行高精度校正，這樣不僅保證了演算法的高效性，而且大大提高了分析的精度。
  2. We also researched the frequency structure of ddc and interchanged the filter multiphase heft and taking out - operation using the theory of equivalent counterchange in multisampling system

    從理論上研究了數字下變頻的頻譜結構，利用多采樣率系統中結構的等效變換原理，將濾波器多相分量與抽取操作進行互換。
  3. The experimental results show : the flattop phenomenon on the diode voltage pulse was very apparent for using the carbon fiber cathode, that is to say, the pulse duration of the diode voltage was widened ; moreover, under the condition of the same power of microwave, the pulse duration of the out - put microwave was prolonged by about 30 % ; the peak power of the microwave was enhanced by 3db

    通過在裝置上做的兩種陰極的對比實驗，結果顯示:碳纖維陰極的使用，改善了電子束質量，使輻射微波的脈寬增加了30 %以上，輻射主瓣方向上的功率密度提高了3db以上，頻譜分佈較純凈，實現了微波的高效輸出。
  4. Evolving the underlying networks to support a mass market, however, presents a number of challenges : spectrum is a limited resource ; cdma standards have sub - optimal spectral efficiency ; layered 3g network architectures are not conducive to low - latency services ; and capacity - enhancing smart antenna or multiple antenna systems have been disappointing

    但開發基本網路以滿足廣大市場，仍面臨幾大挑戰：頻譜資源有限、 cdma標準的光譜效率未達最優、分層3g網路架構未能實現即時服務、及容量增大的智能天線或多天線系統仍不盡人意。
  5. In this thesis, we compared the two acm through simulation, and analyzed their merits and flaws. then we present an optimal design scheme of average spectral efficiency in adaptive coded modulation system

    本文對上述兩種自適應編碼調制策略做了比較，分析了各自的優缺點，並提出了一種基於平均頻譜效率的自適應編碼調制的優化方案。
  6. Spectral efficiency of adaptive transmission in urban microcellular networks

    城市微蜂窩網路中自適應傳輸的頻譜效率
  7. 8psk has the potential to increase the data rate of existing gsm systems by a factor of three

    與原有的gmsk調制方式相比， 8psk不但可以提高數據率，而且可以獲得較高的頻譜效率。
  8. But the spectrum efficiency of the traditional ofdm system is limited due to variance of channel parameters such as channel response and rms delay spread

    但是，決定通信系統調制參數的通道響應和rms時延擴展由於物體的運動或者環境的變化而動態變化，傳統的靜態確定ofdm系統調制參數的方法的頻譜效率不夠高。
  9. Mimo - ofdm has been regarded as the key technology of b3g communication system because it can improve system capacity and spectrum efficiency. however, ofdm is very sensitive to frequency offset

    由於能夠顯著改善頻譜效率、提高數據傳輸速率和系統容量， mimo - ofdm技術被廣泛認為是后三代移動通信系統（ b3g ）的關鍵技術。
  10. The simulation results of wcdma uplink is presented and analyzed. it shows that the combined power and rate control scheme achieve good spectrum efficiency and keep the data rate constant over long time periods

    模擬結果顯示我們提出的基於sir平衡的功率速率聯合控制方案使系統有很好的頻譜效率並在長時間保持數據速率為一個恆定值。
  11. Following the principle of reuse partitioning, two new frequency planning schemes are proposed, the coverage - oriented scheme and the efficiency - oriented scheme, for the cellular system with two - hop fixed relay nodes ( frns )

    摘要根據復用分割原則，提出2種新的兩跳固定中繼蜂窩網的頻譜分配方案，即：側重於覆蓋面積的頻譜分配方案和側重於頻譜效率的頻譜分配方案。
  12. The basic framework of the corresponding transmittersand receivers for stfs are showed, and several combination quomodos for stfs arepresented. at last, the frequencyspectrum efficiencyand error probability of stfs areanalysed, and thevalidityofstfsisprovedbysimulation

    最後對空時頻擴頻碼的頻譜效率和成對錯誤概率進行了分析，對空時頻擴頻碼的有效性進行了模擬證明。
  13. To increase the spectrum efficiency of the ofdm system, a novel aofdm ( adaptive ofdm ) system, which can change its modulation type and length of guard interval according to the estimated channel information, is designed

    為了提高ofdm的頻譜效率，我們設計了一個能根據通道特徵動態改變其調制方式以及保護間隔的自適應ofdm （ aofdm ， adaptiveorthogonalfrequencydivisionmultiplexing ）系統。
  14. Multiple - input multiple - output ( mimo ) technique, offers an effective way to combat and even exploit fading. another technique, orthogonal frequency division multiplexing ( ofdm ), proposed in 1960s, now has gained much attention with its ability to reduce system complexity

    而60年代提出的正交頻分復用（ ofdm ）技術，由於能夠顯著簡化系統接收機的設計並具有優越的頻譜效率，近十多年來也獲得了極大的關注。
  15. Taking uplink as an example, both simplified analysis and intensive computer simulations are presented to offer comparisons among frn enhanced systems with the proposed schemes, with a known channel - borrowing based frequency planning scheme and the conventional cellular system without relaying

    同時，相對于側重覆蓋面積的頻譜分配方案，側重於頻譜效率的頻譜分配方案的頻譜復用距離較小，從而有更高的頻譜利用率，其重點在於解決頻譜效率問題。
  16. In the code division multiple access ( cdma ) system, the multiple access interference ( mai ) mitigation capability as well as system capacity are determined, to a great extent, by the correlation properties of spreading sequences ; while adaptive modulation and coding ( amc ) with high spectral efficiency is the key technique to obtain high speed and low symbol error rate ( ser ) performance in mobile data transmission

    在碼分多址（ cdma ）系統中，擴頻序列的特性在很大程度上決定了抗多址干擾（ mai ）能力和系統容量，而高頻譜效率的自適應調制編碼（ amc ）技術則是獲得高速率和低誤碼率（ ser ）移動數據傳輸性能的關鍵因素。
  17. Future mobile communications have to support the transmission of high rate data and multimedia applications in the radio spectrum, which is already extremely scarce. the basic idea of adaptive coded modulation is to maintain a constant throughput by varying the transmitted power level, symbol transmission rate, constellation size, coding rate or any combination of these parameters. thus, without sacrificing bit - error rate ( ber ), these schemes provide high average spectral efficiency by transmitting at high speeds under favorable channel conditions, and reducing throughput as the channel degrades

    自適應編碼調制（ adaptivecodedmodulation ， acm ）的基本思想是在不犧牲系統傳輸性能（比如ber ）為代價的前提下，通過單獨改變發送功率、波特率、編碼方案、碼率、調制方式，或者是綜合改變前面所述的各種參數，在有利的通道條件下，獲得較大的吞吐量，當通道質量下將時，相應地降低傳輸速率，最終達到提高平均頻譜效率的目的。
  18. Because high - speed data take up wide bandwidth, looking for one which have high efficiency modulation scheme and suitable for frequency hopping communication system is needed

    由於高速數據佔用更寬的帶寬，所以在調制制式上應該尋找一種適合於跳頻通信特點的具有高頻譜效率的調制方案。
  19. Recently, multiple input multiple output ( mimo ) system which originates from the employment of multiple antennas at transmitter and receiver has many advantages such as large system capacity, high spectral efficiency. on the other hand, orthogonal frequency division multiplexing ( ofdm ) which bases on the orthogonal transmission of sub - carriers also has some obvious merits such as strong anti - multipath ability, high spectral efficiency. the combination of the two techniques mimo - ofdm, has become a hotspot recently and regarded as promising technique for future next - generation mobile communication systems

    近來，在無線通信系統中的收發兩端同時使用多根天線的多入多出（ mimo ， multiple - input - multiple - output ）通信結構，具有系統容量大、頻譜效率高等優點;基於正交的多路子載波并行傳輸的正交頻分復用（ ofdm ， orthogonalfrequencydivisionmultiplexing ）技術，具有抗多徑能力強、頻譜效率高等優點，二者的結合，即mimo - ofdm技術，被認為是構建下一代移動通信系統的框架技術。
  20. It is also widely recognized as one of the key techniques in the next generation communication systems. from the above discussion, we can draw a conclusion that the burst cdma and the burst ofdm techniques will receive more and more attentions in the future

    而ofdm作為一種高頻譜效率的調制方式近年來得到了廣泛的肯定，不僅已經在數據地面廣播、無線局域網等通信系統中的到採用，並且在下一代移動通信中很可能成為一種主要的調制方式。
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