mqam 中文意思是什麼

mqam 解釋
多進制正交調幅
  1. The tracking scheme can track the variance of the mimo channel and further reduce system cost. finally, we introduce an mqam sm - ofdm adaptive power and bits allo - cation scheme

    以此為基礎的通道跟蹤方案能進一步減少系統開銷，而且能很好地跟蹤mimo通道的變化。
  2. Fpga and dvb standard are introduced firstly, dvb - c standard and composition of its system are analyzed completely, development of modulator structure and dvb - c digital modulator composition are presented, more over, analysis of respective modular are given. then, principle of dvb - c digital modulator system are presented, they are error control technique 、 mqam 、 nyquist rule and root raised cosine filter 、 window design method for fir filter 、 multi - rate signal processing ( integer interpolating, conversion of fractional sampling, equal conversion of net structure, polyphase structure for filter, poly - phase structure for interpolator, multi - stage implementation of samplying conversion ) 、 distrubited algorithm 、 cic filter 、 dds 、 cordic algorithm

    接著，專門利用一個章節闡述了dvb - c前端調制系統原理，他們了差錯控制技術、多進制調制（ mqam ） 、 nyquist準則與平方根升餘弦濾波器、有限沖擊響應濾波器的窗函數設計法、多抽樣率信號處理包括（整數倍內插原理、分數倍抽樣率轉換、網路結構的等效結構、濾波器的多相表示、內插器的多相表示、抽樣率轉換的多級實現） 、分散式演算法、 cic濾波器、直接數字頻率合成（ dds ） 、 cordic演算法。
  3. The new algorithms for classification of mpsk, mask and mqam signals using cumulant invariants are proposed in gaussian noise and ideal communication channel environment. the new classification features are blind to unknown snr and reference phase

    提出了在高斯噪聲和理想通道環境下，基於高階累量不變量特徵的mpsk 、 mask和mqam信號調制分類演算法，新特徵對信噪比和未知的參考相位參數是盲的。
  4. Also, new expression of ser of mqam in frequency selective fading channel with rake combining is obtained, and throughput performance adaptive mqam with rake receiver in multipath rayleigh fading channel is analyzed

    本文還得到了mqam在頻率選擇性衰落通道中採用rake合併新的誤碼率表達式，並對採用rake接收的自適應mqam在多徑瑞利衰落通道中吞吐量性能進行分析。
  5. In the thesis, an approach that is based on signal - space concepts is used to efficiently evaluate the ber performance of mpsk and mqam over an additive white gaussian noise channel. in particular, accurate ber approximations are obtained and shown to be in good agreement with system simulation results. it may be useful to research and development of digital modulation technologies in hfc of our country

    嘗試採用基於信號空間的分析方法，給出了awgn通道中mpsk和mqam的ber的計算方法以及由這種方法得到的ber性能曲線，然後將信號空間分析法得到的結果與通信系統模擬的結果進行比較，證明其與模擬結果較好地吻合。
  6. The performance of our parameter estimation algorithm applied to mask and mqam signals with known level order are preliminarily investigated through computer simulation. 3

    把基於累量分析的信號參數估計演算法用於已知調制類型的mask 、 mqam信號，通過大量的計算機模擬，初步考察了演算法的性能。
  7. Moreover, new close - form ber expressions of mqam and mpsk in nakagami - / ? ? fading channel are derived, which include the known analytical results as a special case

    本文還導出了nakagami - m衰落通道下mqam和mpsk調制方式新的誤比特率表達式，該表達式可以使現有文獻的分析結果西南交通大學博士研究生學位論文第v頁成為其特例。
  8. Based on the analysis of invariant features in cumulant domain of communication signals, the classification of communication signals with mpsk, mask and mqam modulation formats is investigated this dissertation. the main works can be summarized as follows : 1

    本文在前人工作的基礎上，通過對信號累量域不變量特徵的分析，深入研究了mpsk 、 mask和mqam數字通信信號的調制識別問題，主要工作可概括如下： 1
  9. After comparing their own feature, this paper points out a good future of hfc. hfc network uses high performance, high rate and multi - level digital modulation schemes. the emphasis of the thesis lies in the research of the advanced digital modulation - mpsk and mqam

    本文深入研究了hfc系統中採用的高性能、高速多進制的數字調制解調技術? ? mpsk和mqam的實現原理，並探討了它們的功率利用率和頻帶利用率兩個重要指標。
  10. At the same time, analysis of effects of gaussian distributed and uniform distributed feedback error of the channel fading behavior on throughput performance of adaptive mqam reveals that the obvious throughput loss shall be observed as far as the error exceeds certain limit

    同時，高斯分佈和均勻分佈的通道衰落信息反饋誤差對自適應mqam吞吐量性能影響的研究表明，當誤差超過一定程度時，自適應系統吞吐量性能明顯下降。
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