版權(quán)說(shuō)明:本文檔由用戶(hù)提供并上傳,收益歸屬內(nèi)容提供方,若內(nèi)容存在侵權(quán),請(qǐng)進(jìn)行舉報(bào)或認(rèn)領(lǐng)
文檔簡(jiǎn)介
1、解析TDLTE系統(tǒng)干擾【摘 要】文章對(duì)TD-LTE的系統(tǒng)內(nèi)外干擾的機(jī)理進(jìn)行了系統(tǒng)分析,并結(jié)合標(biāo)準(zhǔn)中的設(shè)備性能最低要求計(jì)算出典型情況下系統(tǒng)間隔離度要求,以及隔離度的實(shí)現(xiàn)方法。Articles 【 pick to 】 the system inside and outside interference mechanism of td-lte has carried on the system analysis, combined with the standard minimum requirements of the equipment properties calculated typical
2、ly isolation between system requirements, and the realization of the isolation methods.【關(guān)鍵詞】TD-LTE 干擾 隔離度【 key words 】 td-lte interference isolation ratio1 概述1 overview隨著TD-LTE標(biāo)準(zhǔn)的凍結(jié)、設(shè)備的成熟以及移動(dòng)互聯(lián)網(wǎng)業(yè)務(wù)飛速發(fā)展,TD-LTE已經(jīng)成為業(yè)界的關(guān)注焦點(diǎn)。而TD-LTE系統(tǒng)內(nèi)外干擾問(wèn)題是網(wǎng)絡(luò)部署時(shí)必須要考慮的關(guān)鍵問(wèn)題之一。As the td-lte standards to freeze, the mature o
3、f the equipment as well as the rapid development of mobile Internet business td-lte has become the focus of concern of the industry. But td-lte system inside and outside interference problem is a network deployment must be one of the key issues to consider.TD-LTE系統(tǒng)面臨的干擾包括噪聲Pn、系統(tǒng)內(nèi)干擾Iintra-system和系統(tǒng)間干
4、擾Iinter-system,下面將分別對(duì)這三種干擾進(jìn)行分析。Td-lte system faced by interfering in Pn, system including noise interference Iintra Iinter - system - between the system and the system interference, the following will respectively analyze the three interference.2 噪聲2 the noise噪聲可以按照來(lái)源分為接收機(jī)內(nèi)部噪聲和外部噪聲。接收機(jī)內(nèi)部噪聲包括導(dǎo)體的熱噪聲和放
5、大器的噪聲放大;外部噪聲是指來(lái)自接收機(jī)以外的非移動(dòng)通信發(fā)射機(jī)的電磁波信號(hào),可以分為自然噪聲和人為噪聲。Noise can be divided into internal noise and external noise receiver according to the source. Internal noise including conductors of heat receiver and amplifier's noise amplification; External noise is from outside of the mobile transmitter rece
6、iver of electromagnetic signals, can be divided into natural and man-made noise.一般在進(jìn)行分析時(shí)主要考慮接收機(jī)內(nèi)部噪聲,可通過(guò)以下式子計(jì)算得到:The receiver when carries on the analysis of main consideration internal noise, can be calculated by the following formula:Pn=KTB+NF (1)Pn + NF = (KTB (1)其中:Among them:K:波爾茲曼常數(shù)(Boltzmann c
7、onstant),1.380662×10-23JK-1;K: Boltzmann constant (the Boltzmann constant), 1.380662 x 10-23 jk - 1;T:開(kāi)爾文絕對(duì)溫度,一般計(jì)算中取常溫290K;T: kelvin, the absolute temperature, general computation of normal temperature 290 k;B:接收機(jī)有效帶寬;B: receiver bandwidth effectively;NF:接收機(jī)的噪聲系數(shù),標(biāo)準(zhǔn)中一般取基站的噪聲系數(shù)分別為7dB。NF: receive
8、r noise coefficient, a standard generally take the noise coefficient of base stations in the 7 db respectively.由于LTE系統(tǒng)帶寬在1.4MHz20MHz可變,并且采用OFDMA/SC-FDMA的多址方式,用戶(hù)實(shí)際只占用系統(tǒng)帶寬中的一部分。因此,信道的熱噪聲水平也會(huì)隨著占用帶寬的變化而變化。Due to the LTE system bandwidth in 1.4 MHz to 20 MHz variable, and the OFDMA/SC - FDMA multiple acc
9、ess methods, users really only part of the system bandwidth. Therefore, channel thermal noise level also will change as the change of bandwidth.3 系統(tǒng)內(nèi)干擾3 interference within the system系統(tǒng)內(nèi)干擾是本移動(dòng)通信系統(tǒng)內(nèi)各無(wú)線網(wǎng)元收發(fā)單元之間的干擾。Interference in the system is in this system for mobile communications interference betw
10、een each wireless network transceiver unit.3.1 同頻干擾3.1 same frequency interferenceTD-LTE系統(tǒng)同小區(qū)下的不同用戶(hù)下行采用OFDMA、上行采用SC-FDMA的多址方式,不同用戶(hù)占用不同的、相互正交的子載波,因此不存在3G系統(tǒng)中的同小區(qū)不同用戶(hù)的多址干擾問(wèn)題。LTE系統(tǒng)中的同頻干擾主要是同頻的其他小區(qū)的干擾,這也是LTE系統(tǒng)中干擾協(xié)調(diào)、抑制技術(shù)要解決的問(wèn)題。Td-lte system with area under different user downlink OFDMA uplink the SC - FDM
11、A, multiple access methods, different users occupy different, mutually orthogonal sub-carrier, so there is no in the 3 g system with multiple-access interference problems of different users. The same frequency interference in LTE system is mainly same frequency interference from the other village, c
12、oordination, this also is in the LTE system interference suppression techniques to solve the problem.3.2 LTE TDD系統(tǒng)上下行鏈路間干擾3.2 TDD LTE TDD system has link between interferenceLTE TDD系統(tǒng)采用時(shí)分雙工的方式,上下行信道工作在相同的頻點(diǎn),通過(guò)上下行轉(zhuǎn)換點(diǎn)設(shè)置上下行信道可占用的時(shí)隙。上行與下行之間由于時(shí)間轉(zhuǎn)換點(diǎn)不一致、基站之間不同步或無(wú)線信號(hào)傳播時(shí)延等,可能出現(xiàn)“重疊”(同時(shí)存在上行鏈路和下行鏈路)的時(shí)間點(diǎn),引起eNode
13、 B小區(qū)間或終端用戶(hù)間的干擾。LTE TDD system USES time division duplex mode, has work in the same frequency channel, TDD by has TDD point set has channel occupancy time slot. Between upward and downward due to the time point of inconsistencies, the sync between base stations or wireless signal propagation delay, e
14、tc., may appear "overlap" (both uplink and downlink link) the point in time, cause interference eNode B district or the end user.(1)相鄰小區(qū)間或同小區(qū)不同頻率間的上下行轉(zhuǎn)換點(diǎn)不一致(1) the neighboring cells or with TDD community between different frequency has breaking point如果相鄰小區(qū)第二轉(zhuǎn)換點(diǎn)設(shè)置不同,在上下行配置不同的時(shí)隙,會(huì)出現(xiàn)一個(gè)小區(qū)eNode
15、B發(fā)射時(shí),另一個(gè)小區(qū)eNode B正在接收的情況,因而將出現(xiàn)比較嚴(yán)重的上下行鏈路間干擾,如圖1所示:If adjacent area the second point of setting, configuration of TDD in has different time slot, will appear a neighborhood eNodeB launch another village eNode B are receiving, so there will be interference between TDD serious has link, as shown in fig
16、ure 1:為了避免該類(lèi)干擾,規(guī)劃中應(yīng)注意:To avoid this kind of interference, the planning should be paid attention to:1)結(jié)合各區(qū)域的上下行業(yè)務(wù)量需求特點(diǎn),盡量在成片的區(qū)域內(nèi)采用同一時(shí)隙分配方案;TDD 1) combined with the regional has traffic demand characteristics, as far as possible use in the area of the piece of the same time slot allocation scheme;2)在采
17、用不同時(shí)隙分配方案的區(qū)域交界處,相鄰兩個(gè)采用不同時(shí)隙分配方案的小區(qū)中,應(yīng)有一個(gè)閉塞發(fā)生重疊的時(shí)隙,或者兩個(gè)相鄰小區(qū)通過(guò)檢測(cè)重疊時(shí)隙上的干擾強(qiáng)度,決定是否將用戶(hù)繼續(xù)分配在該重疊時(shí)隙上。2) in different time slot allocation scheme area at the junction, adjacent to the two different time slot allocation scheme in the neighborhood, there should be a block overlap time slot, and two neighboring c
18、ells by detecting overlapping time slot on the interference intensity, users decide whether to continue to distribute on the overlap time slot.(2)相鄰小區(qū)間失同步(2) loss of synchronization between neighboring cells在相鄰的小區(qū)之間同步基準(zhǔn)不一致時(shí),即使小區(qū)間采用相同的轉(zhuǎn)換點(diǎn)設(shè)置方案,由于起始時(shí)刻不同,也會(huì)有“重疊”時(shí)間點(diǎn)出現(xiàn),如圖2所示:In synchronous datum inconsist
19、encies between adjacent area, even if the same point of setting scheme between zones, due to the different starting point, also can have the "overlapping" point in time, as shown in figure 2:LTE的eNode B之間一般采用外接參考時(shí)鐘源(如GPS或伽利略衛(wèi)星系統(tǒng))實(shí)現(xiàn)同步。當(dāng)外接參考時(shí)鐘源故障,以及同步過(guò)程誤差過(guò)大時(shí),都有可能出現(xiàn)Node B之間失同步。根據(jù)3GPP TS36.133
20、要求,采用相同頻率、且有重疊覆蓋區(qū)域的相鄰Node B之間,幀起點(diǎn)的時(shí)間誤差應(yīng)小于或等于3s(覆蓋距離小于3km);如果滿足該要求,則相鄰小區(qū)間的上下行干擾時(shí)間很短,對(duì)網(wǎng)絡(luò)的性能影響不大。LTE eNode B between generally USES an external reference clock source (such as GPS and Galileo satellite system). When an external reference clock source fault, as well as the synchronization error is too l
21、arge, will likely lose synchronization between the Node B. According to 3 GPP TS36.133 requirements, using the same frequency, and there are overlapping coverage area between adjacent Node B, frame start time error should be less than or equal to 3 mu s (covering distance is less than 3 km); If meet
22、 the requirements, TDD is between adjacent area has interference time is short, and impact on the performance of the network.在規(guī)劃LTE TDD系統(tǒng)的基站間同步時(shí),應(yīng)滿足該要求。In planning LTE TDD system synchronization between the base station should meet the requirements.(3)無(wú)線傳播時(shí)延大于轉(zhuǎn)換點(diǎn)保護(hù)時(shí)隙(3) wireless transmission delay t
23、ime slot is greater than the point of protection在無(wú)線信號(hào)傳播過(guò)程中,隨著傳播距離的增加會(huì)形成傳播時(shí)延。此外,在采用移動(dòng)通信直放站延伸小區(qū)覆蓋距離時(shí),也會(huì)引入直放站設(shè)備的時(shí)延。傳播距離產(chǎn)生的時(shí)延為:In the process of the wireless signal transmission, with the increase of propagation distance will form the propagation delay. In addition, when using mobile communication repea
24、ter station extension region coverage distance, will delay introduction of repeater station equipment. Delay of transmission distance are as follows:=d/c (2) tau = d/c (2)其中,d是傳播距離,c是光速。Where d is the propagation distance, c is the speed of light.在一個(gè)小區(qū)內(nèi)如果傳播時(shí)延過(guò)大,也會(huì)引起終端的上行鏈路對(duì)附近其他終端的下行鏈路接收形成干擾。為了在eNode
25、 B接收端實(shí)現(xiàn)各終端的上行信號(hào)同步,終端必須提前一定的時(shí)間發(fā)送上行的UpPTS和子幀2。如圖3所示,以eNode B發(fā)射端的時(shí)間作為基準(zhǔn),該時(shí)間提前量應(yīng)該等于終端到eNode B的無(wú)線傳輸時(shí)延,也就等于Node B發(fā)射的下行信號(hào)到達(dá)終端的無(wú)線傳輸時(shí)延。如果以終端接收到的下行信號(hào)時(shí)間作為基準(zhǔn),該時(shí)間提前量就是兩倍的無(wú)線傳輸時(shí)延(2)。Within a community if the propagation delay is too big, can also cause the terminal to uplink downlink link received form other termi
26、nal near interference. For the eNode B receiving end realize the uplink signal synchronization of each terminal, the terminal must be a certain amount of time in advance to send up the UpPTS and sub frame 2. As shown in figure 3, to launch the eNode B time as a benchmark, the time schedule should be
27、 equal to the terminal to the eNode B wireless transmission delay tau, the launch of the downlink signal is equal to the Node B reaches the terminal of the wireless transmission delay. If the terminal receives the downlink signal time as a benchmark, the nc is twice the wireless transmission delay (
28、2 tau).相對(duì)于接收到的下行信號(hào)基準(zhǔn),由于終端需要以2的時(shí)間提前量發(fā)送上行UpPTS和子幀2,如果2大于DwPTS和UpPTS之間的保護(hù)間隔GP,就會(huì)引起該終端的上行UpPTS信道干擾附近其他終端接收來(lái)自Node B的DwPTS信道。因此,按照以下公式可確定不產(chǎn)生上下行干擾的最大傳輸距離(即最大覆蓋距離):Relative to the downlink signal received by the benchmark, due to the terminal need to send 2 tau nc uplink UpPTS and sub frame 2, if tau is gre
29、ater than 2 DwPTS and UpPTS protection interval between GP and uplink UpPTS channel interference can cause the terminal near other terminal receiving DwPTS channel from the Node B. Therefore, according to the following formula can be set for TDD does not produce has interference of maximum transmiss
30、ion distance (i.e., maximum coverage range) :(3)(3)其中,tgap是保護(hù)時(shí)間間隔。Among them, the tgap is to protect the time interval.根據(jù)標(biāo)準(zhǔn)中的特殊子幀配置,可計(jì)算得出不同特殊子幀配置格式下TD-LTE基站的最大覆蓋距離,如表1所示:According to the standard of the special child frame configuration, can be calculated under different special subframe configurati
31、on format td-lte base station maximum coverage range, as shown in table 1:如果存在移動(dòng)通信直放站等轉(zhuǎn)發(fā)設(shè)備,由于直放站設(shè)備內(nèi)部的濾波器件固有時(shí)延和光纖介質(zhì)中的信號(hào)傳播時(shí)延,會(huì)導(dǎo)致上述時(shí)延保護(hù)間隔對(duì)應(yīng)的最大覆蓋距離進(jìn)一步縮小。If there is a forward equipment such as mobile communication repeater stations, repeater station equipment due to the internal filter of the inherent t
32、ime delay and fiber optic medium signal propagation delay, lead to the delay protection interval corresponding to the maximum coverage range narrowed.考慮到該干擾信號(hào)經(jīng)過(guò)遠(yuǎn)距離的傳播損耗后,信號(hào)功率已經(jīng)比較微弱,工程中一般較少考慮該干擾的影響。Considering the interference signal after long-distance transmission loss, it is comparatively weak sig
33、nal power, engineering in general, less consider the impact of the interference.(4)鄰頻干擾(4) adjacent frequency interference由于設(shè)備濾波特性的非理想性,干擾也存在于使用相鄰頻率的各方之間。Because of interference device non ideal filter characteristics, also exist in the use of adjacent frequency between parties.假設(shè)不同頻率上的終端數(shù)量和位置分布相同,從
34、3GPP標(biāo)準(zhǔn)中對(duì)接收機(jī)的ACS和ACLR指標(biāo)要求來(lái)看(一般在30dB以上),相對(duì)于同頻干擾,鄰頻干擾對(duì)接收機(jī)的影響小30dB以上,即鄰頻干擾比同頻干擾弱1000倍以上,可以忽略。Assumes that the terminal number and location distribution of different frequency are the same, the receiver from the 3 GPP standard requirements of ACS and ACLR index (generally in more than 30 db), compared wi
35、th the same frequency interference, adjacent frequency interference influence on receiver's little more than 30 db, the adjacent frequency interference more than 1000 times weaker than the same frequency interference, and can be ignored.4 系統(tǒng)間干擾Interference between 4 system4.1 系統(tǒng)間干擾類(lèi)型4.1 system i
36、nterference types從形成機(jī)理角度可分為鄰頻干擾、雜散輻射、接收機(jī)互調(diào)干擾和阻塞干擾。From the perspective of formation mechanism can be divided into the adjacent frequency interference, stray radiation and receiver intermodulation interference and blocking interference.(1)鄰頻干擾(ACI)(1) adjacent frequency interference (ACI)如果不同的系統(tǒng)分配了相鄰
37、的頻率,就會(huì)發(fā)生鄰頻干擾。由于收發(fā)設(shè)備濾波性能的非完美性,工作在相鄰頻道的發(fā)射機(jī)會(huì)泄漏信號(hào)到被干擾接收機(jī)的工作頻段內(nèi);同時(shí)被干擾接收機(jī)也會(huì)接收到工作頻段以外其他發(fā)射機(jī)的工作信號(hào)。決定該干擾的關(guān)鍵特性指標(biāo)是發(fā)射機(jī)的ACLR和接收機(jī)的ACS。If the different allocated adjacent frequency system, adjacent frequency interference occurs. Due to imperfect transceiver equipment filtering performance, launch opportunity workin
38、g in adjacent channel leakage signal to interference receiver within the working frequency band; Also interfere with the receiver will receive the signal transmitter work other than working band. Decide the key characteristic of the interference index is the ACLR transmitter and the receiver of the
39、ACS.(2)雜散輻射(Spurious emissions)(2) the stray radiation (Spurious emissions)由于發(fā)射機(jī)中的功放、混頻、濾波等部分工作特性非理想,會(huì)在工作帶寬以外很寬的范圍內(nèi)產(chǎn)生輻射信號(hào)分量(不包括帶外輻射規(guī)定的頻段),包括電子熱運(yùn)動(dòng)產(chǎn)生的熱噪聲、各種諧波分量、寄生輻射、頻率轉(zhuǎn)換產(chǎn)物以及發(fā)射機(jī)互調(diào)等。Because the transmitter power amplifier, mixer, filter and so on part of the work is not ideal, will be within the scope
40、of the work outside very wide bandwidth to produce radiation signal component (not including specified out-of-band radiation spectrum), including electronic thermal motion produced by thermal noise, harmonic component, stray radiation, frequency conversion and transmitter intermodulation products.鄰頻
41、干擾和雜散輻射不同,鄰頻干擾中所考慮的干擾發(fā)射機(jī)泄漏信號(hào)指的是被干擾接收機(jī)所處頻段距離干擾發(fā)射機(jī)工作頻段較近,尚未達(dá)到雜散輻射的規(guī)定頻段的情況,即有效工作帶寬2.5倍以上(或者工作帶寬上下邊界10MHz以外的頻段)。當(dāng)兩系統(tǒng)的工作頻段相差帶寬2.5倍以上(或者相隔10MHz以上)時(shí),濾波器非理想性將主要表現(xiàn)為雜散干擾。Adjacent frequency interference and the stray radiation is different, considering the interference in the neighboring frequency interference
42、 transmitter leakage signal is interfered with receiver in jammer work frequency spectrum distance, has yet to reach the regulation of stray radiation spectrum, namely the effective working bandwidth of 2.5 times more than 10 MHZ bandwidth fluctuation boundary (or work outside of the band). Differen
43、ce when two system work frequency bandwidth more than 2.5 times (or more than 10 MHZ apart), non ideal filter will be mainly for spurious interference.(3)接收機(jī)互調(diào)干擾(3) receiver intermodulation interference接收機(jī)互調(diào)干擾包括多干擾源形成的互調(diào)、發(fā)射分量與干擾源形成的互調(diào)(TxIMD)、交叉調(diào)制(XMD)干擾。Receiver intermodulation interference componen
44、t includes many interference sources form intermodulation, launch the intermodulation (TxIMD), formed by the interference sources with cross modulation (XMD) interference.多干擾源形成的互調(diào)是由于被干擾系統(tǒng)接收機(jī)的射頻器件非線性,在兩個(gè)以上干擾信號(hào)分量的強(qiáng)度比較高時(shí)所產(chǎn)生的互調(diào)產(chǎn)物。Many interference sources of intermodulation is due to nonlinear interfer
45、ence system receiver rf device, in two or more the strength of the interfering signal component of intermodulation products produced during the relatively high.發(fā)射分量與干擾源形成的互調(diào)是由于雙工器濾波特性不理想,所引起的被干擾系統(tǒng)的發(fā)射分量泄漏到接收端,從而與干擾源在非線性器件上形成互調(diào)。Launch component and the interference sources of intermodulation is not id
46、eal, because the duplexer filter characteristics caused by interference of the component of system leakage to the receiver, thus to form the intermodulation interference sources in the nonlinear devices.交叉調(diào)制也是由于接收機(jī)非線性引起的,在非線性的接收器件上,被干擾系統(tǒng)的調(diào)幅發(fā)射信號(hào),與靠近接收頻段的窄帶干擾信號(hào)相混合,將產(chǎn)生交叉調(diào)制。Cross modulation caused by no
47、nlinear receiver in nonlinear on the receiving device of the jamming system amplitude modulation signal, and near the receiving frequency narrow-band interference signal mix, will produce cross modulation.(4)阻塞干擾(4) blocking interference阻塞干擾并不是落在被干擾系統(tǒng)接收帶寬內(nèi)的。但由于干擾信號(hào)功率太強(qiáng),而將接收機(jī)的低噪聲放大器(LNA)推向飽和區(qū),使其不能正常工
48、作。被干擾系統(tǒng)可允許的阻塞干擾功率一般要求低于LNA的1dB壓縮點(diǎn)10dB。Blocking interference does not fall within the interference system receive bandwidth. But due to the interference signal power is too strong, and the receiver of the low noise amplifier (LNA) to the saturated zone, so that it is not working. Be jamming system ca
49、n allow the barrage jamming power of the general requirements 1 db compression point 10 db below the LNA.根據(jù)不同干擾形成的特性,鄰頻干擾、雜散干擾、互調(diào)干擾都是落在被干擾系統(tǒng)接收機(jī)內(nèi),被其接收而惡化通信質(zhì)量的;阻塞干擾則是在被干擾系統(tǒng)接收帶寬以外,通過(guò)將被干擾系統(tǒng)接收機(jī)推向飽和而阻礙通信的。According to the characteristics of different interference, adjacent frequency interference, stray in
50、terference, intermodulation interference is fall within the jamming system receiver, receiving them and deteriorating quality of communication; Barrage jamming is received by interference system bandwidth, pushed jamming system receiver through the saturated and obstacles to communication.對(duì)于落在被干擾系統(tǒng)的
51、接收帶寬內(nèi)的干擾,可以進(jìn)行功率上的相加??偟母蓴_功率為:To fall by interference within the receiver bandwidth jamming system, can be additive on the power. The total interference power is:(4)(4)其中,PACI、PSE、PIMD分別為鄰頻干擾、雜散干擾、互調(diào)干擾,單位為dBm。Among them, the PACI, PSE, PIMD neighbors frequency interference, stray interference, intermo
52、dulation interference, unit for dBm.一般情況下,三種干擾的強(qiáng)度相差較大;合成的干擾功率將主要取決于其中最大的一項(xiàng)。即使在最極端的情況下,三種干擾強(qiáng)度相等,總的干擾功率增加4.5dB,仍符合一般情況下干擾指標(biāo)留有的余量要求。因此工程中一般分別核算各干擾情況是否滿足系統(tǒng)指標(biāo)要求,以簡(jiǎn)化分析。In general, three types of interference intensity is large; Synthesis of interference power will be subject to one of the biggest one. Eve
53、n in the most extreme cases, three kinds of interference intensity are equal, the total interference power increase 4.5 dB and still conform to the requirements of the normally disturbances leave some allowance. So generally accounted for separately in each interference whether meet the requirements
54、 of system index, in order to simplify the analysis.4.2 系統(tǒng)間干擾分析方法4.2 system interference analysis method干擾分析的方法很多,3GPP TR36.942中提到有兩種:確定性計(jì)算方法和仿真模擬方法。Interfere with the analysis of the method are many, 3 GPP TR36.942 mentioned has two kinds: deterministic calculation method and simulation method.(1)確
55、定性計(jì)算方法(1) deterministic calculation method也稱(chēng)最小允許耦合損耗MCL(Minimum Coupling Loss)計(jì)算方法。確定性計(jì)算方法的優(yōu)點(diǎn)是簡(jiǎn)單易行,可以較容易地獲得理論估計(jì)結(jié)果,所計(jì)算的結(jié)果對(duì)應(yīng)于最?lèi)毫拥那闆r,對(duì)應(yīng)的MCL要求較嚴(yán)格。Also known as the Minimum allowable coupling-loss MCL (Minimum Coupling Loss) calculation. Deterministic calculation method has the advantage of simple, can m
56、ore easily obtain theoretical estimation results, the calculation results correspond to the worst case, a strict corresponding MCL.確定性計(jì)算方法是基于干擾系統(tǒng)和被干擾系統(tǒng)的有關(guān)參數(shù),計(jì)算出系統(tǒng)間要實(shí)現(xiàn)必要的干擾抑制所需要的最小允許耦合損耗MCL。一般MCL采用以下公式計(jì)算:Deterministic calculation method is based on the interference system and interference system rela
57、ted parameters, calculate the system to achieve the necessary interference suppression between the minimum needed to allow the coupling loss MCL. MCL commonly use the following formula:MCL=干擾源輸出功率-衰減-允許的干擾電平MCL = source output power attenuation - allow interference level(5)(5)根據(jù)收發(fā)設(shè)備的ACS/ACLR或者雜散信號(hào)功率
58、、互調(diào)抑制要求等指標(biāo),結(jié)合其工作帶寬和發(fā)射功率,可以計(jì)算出達(dá)到一定干擾抑制要求的MCL。According to ACS/ACLR transceiver equipment or stray indices such as signal power, intermodulation suppression requirements, combined with its working bandwidth and transmission power, can calculate the MCL reaches a certain interference suppression requirement.1)衰減1) the attenuation對(duì)不同的干擾類(lèi)型取定為不同的參數(shù):For different interference types take for different parameters:對(duì)鄰道干擾是ACIR;ACIR for adjacent-channel interference;對(duì)互調(diào)干擾是互調(diào)抑制比。The i
溫馨提示
- 1. 本站所有資源如無(wú)特殊說(shuō)明,都需要本地電腦安裝OFFICE2007和PDF閱讀器。圖紙軟件為CAD,CAXA,PROE,UG,SolidWorks等.壓縮文件請(qǐng)下載最新的WinRAR軟件解壓。
- 2. 本站的文檔不包含任何第三方提供的附件圖紙等,如果需要附件,請(qǐng)聯(lián)系上傳者。文件的所有權(quán)益歸上傳用戶(hù)所有。
- 3. 本站RAR壓縮包中若帶圖紙,網(wǎng)頁(yè)內(nèi)容里面會(huì)有圖紙預(yù)覽,若沒(méi)有圖紙預(yù)覽就沒(méi)有圖紙。
- 4. 未經(jīng)權(quán)益所有人同意不得將文件中的內(nèi)容挪作商業(yè)或盈利用途。
- 5. 人人文庫(kù)網(wǎng)僅提供信息存儲(chǔ)空間,僅對(duì)用戶(hù)上傳內(nèi)容的表現(xiàn)方式做保護(hù)處理,對(duì)用戶(hù)上傳分享的文檔內(nèi)容本身不做任何修改或編輯,并不能對(duì)任何下載內(nèi)容負(fù)責(zé)。
- 6. 下載文件中如有侵權(quán)或不適當(dāng)內(nèi)容,請(qǐng)與我們聯(lián)系,我們立即糾正。
- 7. 本站不保證下載資源的準(zhǔn)確性、安全性和完整性, 同時(shí)也不承擔(dān)用戶(hù)因使用這些下載資源對(duì)自己和他人造成任何形式的傷害或損失。
最新文檔
- 纏繞成型課程設(shè)計(jì)
- 國(guó)際象棋的課程設(shè)計(jì)
- 游戲人物鑒賞課程設(shè)計(jì)
- 中考生物考前必背知識(shí)手冊(cè)(含習(xí)題詳解)
- 美化文字微課程設(shè)計(jì)
- 統(tǒng)計(jì)軟件課程設(shè)計(jì)預(yù)測(cè)
- 自然主題幼兒園課程設(shè)計(jì)
- 中風(fēng)護(hù)理工作總結(jié)
- 電機(jī)順序啟動(dòng)課程設(shè)計(jì)
- 2024年設(shè)備監(jiān)理師考試題庫(kù)含答案(基礎(chǔ)題)
- 貨款互抵三方協(xié)議合同范本
- 七年級(jí)道德與法治論文2000字(合集六篇)
- 嚴(yán)重精神障礙患者健康管理服務(wù)規(guī)范
- 風(fēng)險(xiǎn)預(yù)測(cè)分析及風(fēng)險(xiǎn)與機(jī)遇評(píng)估分析表
- 高中日語(yǔ)宣講 試聽(tīng)課件
- 壓力彈簧力度計(jì)算器及計(jì)算公式
- 新生兒窒息診斷地專(zhuān)家共識(shí)
- 2023年重慶市旅游業(yè)統(tǒng)計(jì)公報(bào)要點(diǎn)
- 器械清洗的資料
- 路立得4.1roadleaderv3.0說(shuō)明書(shū)Roadleader是鴻業(yè)研制的BIM系列軟件之一旨在
- 陜西省教育科學(xué)規(guī)劃課題開(kāi)題報(bào)告
評(píng)論
0/150
提交評(píng)論