【摘要】：當(dāng)前,國(guó)內(nèi)運(yùn)營(yíng)商正在大規(guī)模建設(shè)TD-LTE蜂窩移動(dòng)通信網(wǎng)。而無(wú)線電頻譜資源的稀缺性則日益凸顯,將來(lái)很可能會(huì)出現(xiàn)TD-LTE系統(tǒng)與異系統(tǒng)使用相同或相鄰頻段在同一地理區(qū)域內(nèi)進(jìn)行網(wǎng)絡(luò)部署的情形。由于無(wú)線通信系統(tǒng)收發(fā)機(jī)設(shè)備的非理想特性,會(huì)引起同一區(qū)域內(nèi)共存無(wú)線通信系統(tǒng)之間的互相干擾,從而影響無(wú)線通信系統(tǒng)性能。因此,應(yīng)采取怎樣的保護(hù)度及相應(yīng)的規(guī)避措施,以提高700MHz頻段TD-LTE-CR與數(shù)字廣播電視系統(tǒng)性能,以及對(duì)功控參數(shù)進(jìn)行合理的取值,改善對(duì)功率的分配,可以使得TD-LTE MiFi大功率用戶(hù)可以像普通UE一樣與其它系統(tǒng)良好的共存,而對(duì)系統(tǒng)性能沒(méi)有太大影響,以上兩點(diǎn)對(duì)于理論研究和工程實(shí)踐都具有重要意義。本文首先綜合采用確定性分析和系統(tǒng)級(jí)蒙特卡洛靜態(tài)仿真的方法,對(duì)700MHz頻段TD-LTE與數(shù)字廣播電視系統(tǒng)(DTMB)的干擾共存問(wèn)題進(jìn)行了研究。通過(guò)細(xì)致分析所設(shè)計(jì)的4種共存場(chǎng)景,得出了在城市和農(nóng)村環(huán)境下系統(tǒng)之間共存所需的隔離條件,為進(jìn)行合理的頻譜規(guī)劃與網(wǎng)絡(luò)部署提供參考。接著考慮在TD-LTE基站加入CR(認(rèn)知無(wú)線電)模塊的情況,通過(guò)檢測(cè)空中信號(hào)獲取所處無(wú)線環(huán)境下頻譜占用信息的頻譜檢測(cè)方法,采用頻譜檢測(cè)方式的CR技術(shù),改變傳統(tǒng)的固定頻率分配為動(dòng)態(tài)的頻率分配。通過(guò)檢測(cè)DTMB系統(tǒng)的頻譜占用信息,來(lái)控制TD-LTE基站的工作狀態(tài)。此時(shí)的仿真場(chǎng)景也有所改變,仍然綜合采用確定性分析和系統(tǒng)級(jí)蒙特卡洛靜態(tài)仿真的方法,在一定的CR檢測(cè)正確率、CR檢測(cè)方式、保護(hù)距離、隔離帶寬等約束條件下,計(jì)算出需提供的額外鄰信道干擾功率比值(ACIR)。得出兩個(gè)系統(tǒng)之間干擾分析的結(jié)論和抑制干擾的規(guī)避措施。最后,本文研究了TD-LTE大功率MiFi用戶(hù)與LTE FDD系統(tǒng)及WCDMA系統(tǒng)之間的干擾共存問(wèn)題,仍然采用系統(tǒng)級(jí)蒙特卡洛靜態(tài)仿真的方法,仿真結(jié)果表明：對(duì)功控參數(shù)進(jìn)行合理的取值,改善對(duì)功率的分配,可以使得在所考察的仿真場(chǎng)景下TD-LTE MiFi大功率用戶(hù)可以像普通UE一樣與其它系統(tǒng)良好的共存,而對(duì)系統(tǒng)性能沒(méi)有太大影響。
[Abstract]:At present, domestic operators are building TD-LTE cellular mobile communication network on a large scale. However, the scarcity of radio spectrum resources is becoming increasingly prominent. In the future, it is likely that TD-LTE systems and other systems will use the same or adjacent frequency bands to deploy the network in the same geographical region. Due to the non-ideal characteristics of transceiver devices in wireless communication systems, the mutual interference between wireless communication systems in the same region will be caused, which will affect the performance of wireless communication systems. Therefore, what protection measures should be taken to improve the performance of 700MHz band TD-LTE-CR and digital radio and television system, and to select the reasonable value of power control parameters, and to improve the distribution of power, The TD-LTE MiFi high power users can coexist well with other systems like ordinary UE without much influence on the system performance. The above two points are of great significance for both theoretical research and engineering practice. In this paper, the interference coexistence of 700MHz band TD-LTE and digital broadcast television system (DTMB) is studied by means of deterministic analysis and system level Monte Carlo static simulation. Through the detailed analysis of the four kinds of coexistence scenarios designed, the isolation conditions needed for the coexistence between the system in the urban and rural environments are obtained, which provide a reference for the rational spectrum planning and network deployment. Then we consider adding CR (Cognitive Radio) module to the TD-LTE base station, obtain the spectrum occupation information of the wireless environment by detecting the air signal, and adopt the CR technology of the spectrum detection mode. Change the traditional fixed frequency allocation to dynamic frequency allocation. The working state of the TD-LTE base station is controlled by detecting the spectrum occupation information of the DTMB system. At the same time, the simulation scene is also changed, and the methods of deterministic analysis and system-level Monte Carlo static simulation are still used, under certain CR detection accuracy, CR detection mode, protection distance, isolation bandwidth and other constraints. Calculate the additional neighbor channel interference power ratio (ACIR). To be provided The conclusion of the interference analysis between the two systems and the measures to avoid the interference are obtained. Finally, the problem of interference coexistence between TD-LTE high power MiFi users, LTE FDD system and WCDMA system is studied. The static simulation method of system level Monte Carlo is still used. The simulation results show that the power control parameters are reasonably selected. By improving the power distribution, TD-LTE MiFi users can coexist well with other systems just like the ordinary UE in the simulation scenarios investigated, without much influence on the system performance.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TN929.5

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