time variant channel 中文意思是什麼

time variant channel 解釋
時變增益
  • time : n 1 時，時間，時日，歲月。2 時候，時刻；期間；時節，季節；〈常pl 〉時期，年代，時代； 〈the time ...
  • variant : adj. 1. 相異的，不同的，不一致的。2. 各種各樣的。3. 易變的，不定的。n. 1. 變體，變形；變量。2. （字音的）轉訛；（字的）異體。3. 【統計學】變式；【生物學】變種，變異體。
  • channel : n 1 水路，水道，渠，溝；海峽；河床，河底。2 （柱等的）槽，凹縫；【機械工程】槽鐵，凹形鐵。3 〈比...
  1. Based on piecewise linear model, this paper proposes an estimation method that first estimates the slope of linear variant and the channel impulse response at the middle time of the current ofdm symbol using pilot sequences, and then estimates the whole channel impulse response through the estimated parameters

    該演算法首先利用導頻序列估計出當前ofdm符號間隔內通道線性變化的斜率和中間時刻通道的沖激響應值，然後根據線性模型利用估計出的參數得到當前符號間隔內所有時刻上的通道沖激響應。
  2. The simulation results show that two algorithms can efficiently estimate channel parameters, but the late method has better performance than the former when channel is time - variant. finally, there are conclusion and prospect

    模擬結果表明，兩種通道估計方法都能夠有效估計通道參數，而無訓練比特的迭代通道估計方法在跟蹤通道參數變化方面的性能更優越。
  3. The simulation results based on siso and mimo systems show that the proposed scheme could effectively eliminate the time - variant fading characteristics of wireless channel and under an acceptable demand of ber, the frequency efficiency is enhanced greatly and besides, dynamic encoding is implemented with low complexity and high efficiency

    通過在單天線和多天線系統中的模擬，表明該方案可以有效的克服無線通道的時變衰落特性，在滿足誤碼率性能要求的基礎上可以提高系統頻譜利用率，且實現復雜度低。
  4. With the characteristics of large ambient noise, very narrow bandwidth, low carrier frequency, great propagation latency and time - space - frequency variant multipath effect ( mpe ), the stochastic ocean channel has demonstrated the greatest complexity and difficulty for underwater acoustic wireless communications. among them multipath effect ( mpe ) is the most difficult obstacle that results in signal fading and inter - symbol interference ( isi )

    但是噪聲高、帶寬窄、載波頻率低、傳輸時延大、多途徑效應隨時間?空間?頻率變化等通道特性都會給有效、可靠的水聲通信帶來很大的麻煩，其中多途徑效應是最主要的困擾因素，它會導致信號幅度衰落和碼間干擾。
  5. Performance analysis of closed loop transmit diversity for wcdma systems in a time variant fading channel

    系統閉環發送分集的性能分析
  6. However, high - speed data transmission system suffers from time - variant multi - path fading and inter - symbol interference ( isi ). as a solution, adaptive equalization can effectively combat isi by compensationg for channel distortation

    隨著數據率的提高，通道呈現出頻率選擇性，信號的一些頻率成分將產生深度衰落，產生碼間干擾（ isi ） ，影響系統的性能。
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