發(fā)布時(shí)間：2019-06-14 03:41

【摘要】：隨著5G時(shí)代的到來(lái),對(duì)高速移動(dòng)互聯(lián)網(wǎng)數(shù)據(jù)業(yè)務(wù)的需求越來(lái)越高。在營(yíng)4G系統(tǒng)中提高小區(qū)吞吐量的方法在現(xiàn)有小區(qū)架構(gòu)下已經(jīng)達(dá)到性能極限,需要大力發(fā)展新型無(wú)線傳輸技術(shù)和網(wǎng)絡(luò)架構(gòu)。面向蜂窩移動(dòng)通信系統(tǒng)的D2D通信技術(shù)應(yīng)運(yùn)而生,其通過(guò)復(fù)用蜂窩通信鏈路的時(shí)頻資源以增加小區(qū)容量、提高資源利用率、降低能量消耗并獲得高傳輸速率,近年來(lái)引起極大關(guān)注。在傳統(tǒng)蜂窩網(wǎng)絡(luò)中,中繼技術(shù)可以增加功率利用率獲得空間分集增益以對(duì)抗多徑衰落。本論文將中繼技術(shù)與D2D技術(shù)相結(jié)合,研究其中斷概率以及遍歷可達(dá)速率等系統(tǒng)性能。首先,研究了基于AF中繼D2D通信系統(tǒng)的中斷概率以及可達(dá)速率。考慮每個(gè)用戶均受到干擾與噪聲,分析推導(dǎo)了中斷概率以及可達(dá)速率的閉合表達(dá)式。針對(duì)D2D鏈路的中斷概率,討論三種特殊場(chǎng)景包括：高SNR場(chǎng)景,D2D鏈路遠(yuǎn)離基站場(chǎng)景以及D2D鏈路遠(yuǎn)離蜂窩鏈路場(chǎng)景并推導(dǎo)了近似閉合表達(dá)式。在D2D鏈路總功率恒定的條件下,提出了D2D用戶和中繼用戶間的功率分配方案以降低中斷概率,得到了功率分配方案的解析表達(dá)式。對(duì)于系統(tǒng)可達(dá)速率,聯(lián)合考慮了蜂窩鏈路與D2D鏈路的可達(dá)速率,在用戶發(fā)射功率受限的前提下,提出蜂窩鏈路與D2D鏈路聯(lián)合優(yōu)化方案以最大化系統(tǒng)的可達(dá)速率,大大降低了算法復(fù)雜度。其次,在同時(shí)考慮節(jié)點(diǎn)所受干擾與噪聲的場(chǎng)景下,提出了基于雙向AF中繼D2D傳輸模式,分析了D2D鏈路干擾模型,分別推導(dǎo)了強(qiáng)蜂窩用戶干擾與弱蜂窩用戶干擾兩種場(chǎng)景下系統(tǒng)中斷概率精確解表達(dá)式,并在此結(jié)果上進(jìn)一步求出高SNR場(chǎng)景下的近似解。仿真結(jié)果驗(yàn)證推導(dǎo)的正確性并表明基于雙向AF中繼D2D通信系統(tǒng)的中斷概率在不引入額外功率的前提下可以大幅提高系統(tǒng)的中斷性能。隨后,在同時(shí)考慮干擾及噪聲的基于雙向DF中繼的D2D通信系統(tǒng)中,研究了D2D鏈路的中斷概率以及遍歷可達(dá)速率。根據(jù)基于雙向DF中繼系統(tǒng)的中斷概率以及遍歷可達(dá)速率的定義,討論推導(dǎo)了在對(duì)稱與非對(duì)稱兩種情況(中繼用戶從兩D2D用戶接收到的功率是否相等)下中斷概率以及遍歷可達(dá)速率的精確解析表達(dá)式。在精確表達(dá)式的基礎(chǔ)上,得出了高SNR場(chǎng)景下的近似表達(dá)式。針對(duì)中斷概率以及遍歷可達(dá)速率兩種系統(tǒng)性能,分別提出功率優(yōu)化方案以最優(yōu)化系統(tǒng)性能。接著,針對(duì)處于同一小區(qū)以及不同小區(qū)的兩用戶的傳輸模式,提出了模式切換策略以最大化可達(dá)速率。考慮兩用戶間的三種傳輸模式包括：傳統(tǒng)蜂窩傳輸模式、D2D傳輸模式以及基于雙向DF中繼的D2D傳輸模式,提出了三種傳輸模式間的切換策略。結(jié)果顯示當(dāng)兩用戶距離很近時(shí)采用D2D傳輸模式而當(dāng)兩者距離很遠(yuǎn)時(shí)則采用傳統(tǒng)蜂窩傳輸模式,當(dāng)用戶間距離介于中間值時(shí)采用基于雙向DF中繼的D2D傳輸模式性能最優(yōu)。最后,研究了配置多天線的基站采用BF和IC預(yù)編碼策略時(shí)D2D通信系統(tǒng)的遍歷可達(dá)速率。推導(dǎo)了有限反饋MIMO系統(tǒng)以及基站可以獲取理想CSI兩種場(chǎng)景下,采用BF和IC策略時(shí)D2D系統(tǒng)的遍歷可達(dá)速率的精確表達(dá)式以及上下界的表達(dá)式�；谶@些結(jié)論,討論了三種特殊場(chǎng)景包括高SNR場(chǎng)景、弱干擾場(chǎng)景以及大規(guī)模天線場(chǎng)景,分別推導(dǎo)了三種特殊場(chǎng)景下上下界的近似解。研究結(jié)果顯示高信噪比場(chǎng)景以及弱干擾場(chǎng)景下系統(tǒng)的遍歷可達(dá)速率存在穩(wěn)定值,有限反饋MIMO系統(tǒng)中隨著天線數(shù)增加系統(tǒng)的遍歷可達(dá)速率同樣存在一個(gè)穩(wěn)定值,而對(duì)于理想CSI的場(chǎng)景系統(tǒng)的遍歷可達(dá)速率隨著天線數(shù)呈對(duì)數(shù)增長(zhǎng)。
[Abstract]:With the arrival of the 5G time, the demand for high-speed mobile Internet data service is getting higher and higher. The method of improving the cell throughput in the 4G system of the camp has reached the performance limit under the existing cell architecture, and the new type of wireless transmission technology and the network architecture need to be vigorously developed. The D2D communication technology facing the cellular mobile communication system comes into being, which has caused great concern in recent years by multiplexing the time-frequency resources of the cellular communication link to increase the cell capacity, improve the resource utilization rate, reduce the energy consumption and obtain the high transmission rate. In a conventional cellular network, a relay technique can increase power utilization to obtain a spatial diversity gain to combat multi-path fading. In this paper, the relay technology and the D2D technology are combined to study the system performance such as the break probability and the traverse rate. First, the interrupt probability and the reachable rate of a D2D communication system based on the AF relay are studied. Considering that each user is subject to interference and noise, a closed expression of the interrupt probability and the reachable rate is derived. In view of the outage probability of the D2D link, the three special scenarios are discussed: the high SNR scene, the D2D link remote from the base station scene and the D2D link away from the cellular link scene and the approximate closed expression is derived. Under the condition that the total power of the D2D link is constant, the power distribution scheme between the D2D user and the relay user is proposed to reduce the interrupt probability and the analytic expression of the power distribution scheme is obtained. The reachable rate of the cellular link and the D2D link is considered in combination with the system reachable rate, and the joint optimization scheme of the cellular link and the D2D link is proposed under the premise of the limited user transmission power, so that the reachable rate of the system is maximized, and the algorithm complexity is greatly reduced. Secondly, under the scene of simultaneous consideration of the interference and noise of the node, a two-way AF relay D2D transmission mode is proposed, the D2D link interference model is analyzed, and the exact solution expression of the system interrupt probability under the two scenarios of strong cellular user interference and weak cellular user interference is derived respectively, And the approximate solution in the high SNR scene is further obtained on the result. The simulation result verifies the correctness of the derivation and indicates that the interruption probability based on the two-way AF relay D2D communication system can greatly improve the interrupt performance of the system without introducing additional power. Then, in the two-way DF-relay-based D2D communication system considering both the interference and the noise, the interrupt probability and the traverse rate of the D2D link are studied. Based on the interrupt probability of the two-way DF relay system and the definition of the traversal rate, the exact analytical expression of the interrupt probability and the traversal rate of the two cases (whether the relay user receives the power from the two D2D users) under the symmetric and asymmetric conditions (whether the power received from the two D2D users is equal) is discussed. On the basis of the exact expression, the approximate expression in the high SNR scene is obtained. In ord to optimize that performance of the system, a power optimization scheme is proposed to optimize the performance of the system. Then, for the transmission mode of two users in the same cell and different cells, a mode switching strategy is proposed to maximize the achievable rate. The three transmission modes between two users are considered: the traditional cellular transmission mode, the D2D transmission mode and the D2D transmission mode based on the two-way DF relay, and the switching strategy among the three transmission modes is proposed. The results show that when the distance between the two users is very close, the traditional cellular transmission mode is adopted, and when the distance between the users is between the intermediate value, the performance of the D2D transmission mode based on the two-way DF relay is optimal. Finally, the rate of traversal of the D2D communication system when the base station with multiple antennas is configured with the BF and the IC pre-coding strategy is studied. In this paper, a finite feedback MIMO system and a base station can be used to obtain the exact expression of the reachable rate of the D2D system and the expression of the upper and lower bounds when using the BF and the IC policy. Based on these conclusions, three special scenarios, including high SNR scene, weak interference scene and large-scale antenna scene, are discussed. The research results show that the high signal-to-noise ratio scene and the ergodic reach rate of the system under the low-interference scene are stable, and a stable value is also present in the limited feedback MIMO system with the increase of the number of antennas. While the traversal rate of the scene system for the ideal csi increases exponentially with the number of antennas.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN929.5

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