frequency selective fading造句
例句與造句
- Frequency selective fading
頻率選擇性衰落色散衰落 - A time - varying disperse channel is a channel that contain both frequency selective fading and time selective fading
時變色散信道則是同時存在頻率和時間選擇性衰落的信道。 - Single carrier frequency domain equalization for high data rate transmission systems over frequency selective fading channels
頻率選擇性信道下高速數(shù)據(jù)傳輸中的單載波頻域均衡技術(shù) - Subsequently the channel was modeled for three types namely additive white gaussian noise , flat fading and frequency selective fading . lastly , the receiver was studied
接下來信道建模成三種不同的類型，即加性高斯白噪聲信道、平坦衰落信道和頻率選擇性衰落信道。 - Based on the research of mimo detections under the flat fading channel , this paper focuses on the mimo detection under the frequency selective fading channel , chiefly aiming at the lll detection algorithm
在對平坦衰落信道下mimo檢測技術(shù)研究的基礎(chǔ)上,本文展開了對頻率選擇性信道下mimo檢測技術(shù)的研究。 - It's difficult to find frequency selective fading in a sentence. 用frequency selective fading造句挺難的
- In wireless digital transmissions , due to the delay dispersion of the transmitted symbols and the limitation of channel bandwidth , the channel may induce inter - symbol interference ( isi ) , which results the frequency selective fading
在無線數(shù)字傳輸中，由于時延擴展和信道帶寬限制，引起碼間串?dāng)_，產(chǎn)生頻率選擇性衰落。 - In recent years , there has been a lot of interest in applying orthogonal frequency division multiplexing ( ofdm ) in wireless systems because of its various advantages in lessening the severe effects of frequency selective fading
近年來，正交頻分復(fù)用( ofdm )作為一種具有高傳輸效率以及良好的抗頻率衰落性能，得到了廣泛的關(guān)注。 - 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在頻率選擇性衰落信道中采用rake合并新的誤碼率表達(dá)式，并對采用rake接收的自適應(yīng)mqam在多徑瑞利衰落信道中吞吐量性能進(jìn)行分析。 - Comparison study between the constant modulus decision feedback equalizer ( dfe ) and several others is made on combating the frequency selective fading of uwac , and their tracking performance to time varying is also investigated
?針對水聲信道的頻率選擇性衰落，對比研究了常數(shù)模判決反饋盲均衡算法與其它幾種盲均衡算法的性能。針對水聲信道的時變特性，研究了該算法的跟蹤摘要性能。 - However , to achieve this objective , various technical challenges must be overcome . for example , the deployment of broad - band wireless access systems would require a transmission technique which can mitigate the detrimental effects of frequency selective fading
為達(dá)到這一目的，有一些技術(shù)問題必須得到良好的解決，比方說在寬帶通信模式下由于延遲擴展造成的頻率選擇性擴展和由多普勒效應(yīng)產(chǎn)生的信道時域衰落。 - The tapped delay model of the multi - path frequency selective fading channels as well as the diversity receiver technique is introduced , and the principles of rake receiver are described . then various downlink channel estimation techniques , such as simple averaging , wmsa and fbprelms are analysed in detail
本文首先討論了移動通信信道的各種參數(shù)對信道估計的影響,介紹了頻率選擇性信道的抽頭延遲線模型和分集接收技術(shù),在此基礎(chǔ)上闡述了rake接收機的原理。 - By orthogonal frequency division multiplexing ( ofdm ) , the channel can be divided into a number of orthogonal sub - channels on which data can be transmitted with low rates simultaneously , thus it can overcome the frequency selective fading effectively . multiple - input multiple - output ( mimo ) is the great breakthrough of smart antennas in wireless communication area , which can make use of the increased spatial channels to improve the system capacity
第二代移動通信系統(tǒng)( 2g )主要是為了支持話音和低速率的數(shù)據(jù)業(yè)務(wù)而設(shè)計的,隨著高傳輸速率、高質(zhì)量視頻和交互式操作的新一代無線多媒體業(yè)務(wù)的發(fā)展,將mimo和ofdm技術(shù)結(jié)合應(yīng)用于未來寬帶無線通信系統(tǒng)中,是一種有廣闊應(yīng)用前景的無線鏈路傳輸解決方案。 - At this part , it firstly comes up with a quasi - static frequency selective fading channel model . based on this channel model , considering about the characteristics of the model and the lattice reduction complexity , we proposed a new detection strategy , which is the lll detection algorithm combined with decision - feedback technique
首先提出了準(zhǔn)靜態(tài)頻率選擇性多徑信道模型,然后基于該模型提出了一種新的用于準(zhǔn)靜態(tài)頻率選擇性信道的檢測方案,即與判決反饋相結(jié)合的格約簡輔助檢測方案。 - With the downlink simulation model constructed , performance of wideband cdma under different radio propagation environment and vehicular speed is simulated . based on system model of mc ds cdma under flat fading channel with relative shifts of spreading sequences within 1 chip and frequency selective fading channel with arbitrary relative chip shifts , performance of multicarrier cdma system with go sequences under different radio environment is investigated
基于多載波直接序列碼分多址在乎坦衰落信道中序列偏移小于1個碼片及在頻率選擇性衰落信道中偏移任意個碼片的系統(tǒng)模型，本文還分析了采用廣義正交序列的多載波碼分多址系統(tǒng)在不同無線傳播環(huán)境下的性能。 - So far , there is not much research on the signal detection of da - mimo system , and the general frequency selective channel is not taken into consideration . in chapter 3 of this dissertation , the coherent signal detection algorithms for da - mimo system under both flat fading and frequency selective fading channels are derived . and the analysis of the factors which affect the performance of the detection algorithms is also illustrated through computer simulations
針對分布mimo信號檢測目前研究較少,并且沒有考慮一般意義下的頻率選擇性信道的情況,本文在第三章分別推導(dǎo)了基于平坦衰落和頻率選擇性衰落信道環(huán)境的分布mimo信號相干檢測算法,并通過計算機仿真,對影響算法檢測性能的因素進(jìn)行了分析討論。
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