發(fā)布時(shí)間：2018-05-03 00:41

  本文選題：頻譜效率 + 能效�。� 參考：《西南交通大學(xué)》2014年博士論文

【摘要】：未來高容量和強(qiáng)覆蓋性的通信網(wǎng)絡(luò)中,由宏基站、中繼站和微微基站等低功率站點(diǎn)構(gòu)成的異構(gòu)網(wǎng)受到了廣泛關(guān)注。過去的十幾年,大部分的研究都是通過設(shè)計(jì)不同的網(wǎng)絡(luò)架構(gòu)來改善小區(qū)的頻譜效率進(jìn)而提高小區(qū)的網(wǎng)絡(luò)吞吐率。但為了滿足用戶日益增長的數(shù)據(jù)需求和無處不在的接入需求,急需對(duì)網(wǎng)絡(luò)基礎(chǔ)設(shè)施進(jìn)行快速的擴(kuò)張,由此引入了巨大的能量消耗,隨著引入低功率站點(diǎn),網(wǎng)絡(luò)的能耗單元也相應(yīng)地增加,所以無線異構(gòu)網(wǎng)的能效問題變得更為關(guān)鍵。如何在保障用戶服務(wù)質(zhì)量(QoS)的情況下,保證系統(tǒng)擁有高能效,也是現(xiàn)今通信技術(shù)發(fā)展的趨勢。本文以下行鏈路的無線資源分配為基本研究對(duì)象,結(jié)合時(shí)域、頻域、功率域等方面的技術(shù),以高的頻譜效率或高能效為目標(biāo),對(duì)異構(gòu)網(wǎng)中,中繼網(wǎng)絡(luò)和宏-微微網(wǎng)絡(luò)的路徑選擇、資源調(diào)度及分配、干擾協(xié)調(diào)等算法進(jìn)行優(yōu)化設(shè)計(jì)。首先,提出一種解碼轉(zhuǎn)發(fā)(DF)中繼系統(tǒng)中聯(lián)合部分頻率復(fù)用和自適應(yīng)調(diào)制技術(shù)(AMC)的載波分配方案。該方案采用了全雙工、雙天線的DF中繼模式來提高時(shí)隙資源利用率,利用AMC技術(shù)對(duì)干擾容忍的特性,動(dòng)態(tài)復(fù)用基站(BS)和中繼站(RS)所使用的頻率來提高頻譜利用率,從而獲得高能效的傳輸速率。這種聯(lián)合部分頻率復(fù)用方法和全復(fù)用中繼模式的方案比起單天線半雙工中繼模式,能提升較大的系統(tǒng)吞吐率。其次,基于離散調(diào)制水平集合,提出了非再生中繼多用戶網(wǎng)絡(luò)的中繼選擇和載波、比特分配的聯(lián)合優(yōu)化方案。該方案在用戶速率限制的條件下,通過使發(fā)送功率最小來達(dá)到提升能效的目的。首先,基于初始問題的目標(biāo),提出了一個(gè)基于放大轉(zhuǎn)發(fā)(AF)中繼系統(tǒng)的低復(fù)雜度的中繼選擇方案。然后根據(jù)中繼選擇所得結(jié)果,將中繼用戶的兩跳鏈路虛擬成直傳鏈路,由此將中繼小區(qū)問題轉(zhuǎn)換成傳統(tǒng)的蜂窩小區(qū)問題,進(jìn)行載波、比特的分配。最后,考慮中繼最大功率的限制,對(duì)超負(fù)荷的中繼進(jìn)行適當(dāng)?shù)恼{(diào)整。通過分析結(jié)果可知,本文所提次優(yōu)方案,在降低了初始問題算法復(fù)雜度的同時(shí),所得的結(jié)果接近最優(yōu)方案。而且,本文所提中繼選擇方案較傳統(tǒng)的中繼選擇方案,降低了系統(tǒng)的功耗。再次,基于離散調(diào)制水平集合和機(jī)會(huì)網(wǎng)絡(luò)編碼,提出了再生中繼網(wǎng)絡(luò)中一種中繼選擇和載波、比特分配的聯(lián)合優(yōu)化方案。該方案根據(jù)信道狀態(tài),機(jī)會(huì)地引入網(wǎng)絡(luò)編碼從而提高頻譜利用率,在用戶速率限制的條件下,通過使每幀的發(fā)送功率最小來達(dá)到提升能效的目的。該方案將中繼選擇和載波、比特分配進(jìn)行分步求解,得到一個(gè)次優(yōu)解。其中,利用本文所提中繼選擇方案,會(huì)使更多的用戶選擇中繼,這為網(wǎng)絡(luò)編碼提供了更多的機(jī)會(huì)。而所提的機(jī)會(huì)網(wǎng)絡(luò)編碼分配方案根據(jù)信道狀態(tài)機(jī)會(huì)地進(jìn)行網(wǎng)絡(luò)編碼,所以比固定網(wǎng)絡(luò)編碼分配方案和無網(wǎng)絡(luò)編碼方案大大節(jié)約了系統(tǒng)的功耗。然后,基于DF中繼和AF中繼的正交頻分多路復(fù)用(OFDM)頻率選擇性鏈路,分別提出了最優(yōu)能效的功率分配方案。這兩個(gè)方案在證明了最優(yōu)解存在且唯一的情況下,考慮了電路所耗功率的影響。其中,DF中繼鏈路的功率方案利用DF中繼解碼轉(zhuǎn)發(fā)的特性,將兩跳鏈路分離進(jìn)行求解,通過比較選取最好的分配方式,該方法可求出最大化能效的最優(yōu)功率解,是DF中繼鏈路能效上界；而AF中繼鏈路的功率分配方案包含兩個(gè)步驟,先根據(jù)信道進(jìn)行載波分配,并根據(jù)載波配對(duì)的結(jié)果,將AF中繼鏈路虛擬成一跳頻選鏈路,然后利用一跳頻選鏈路的方法進(jìn)行功率分配,該AF中繼鏈路能效自適應(yīng)優(yōu)化方法可獲得逼近最優(yōu)解的次優(yōu)解。此外,DF中繼和AF中繼的鏈路方案都考慮了速率和功率限制下的功率分配方法,并分析了其對(duì)能效的影響。接下來,在總功率和用戶速率均有限制的要求下,提出了用戶非均勻分布的AF中繼小區(qū)下行鏈路中繼選擇和功率分配聯(lián)合優(yōu)化方案。利用AF中繼鏈路的虛擬增益,將中繼問題轉(zhuǎn)換為單跳小區(qū)問題,并用注水算法求得次優(yōu)的功率分配。該算法可較好地逼近最優(yōu)解,得到總能效的下邊界。此外,由于電路功耗在系統(tǒng)總能耗中占有較大比例,為了進(jìn)一步節(jié)約能耗,從而提高能效,該方案引入了中繼和基站的休眠模式,根據(jù)用戶分布情況關(guān)閉負(fù)載較低的站點(diǎn),從而以較小的容量損失,獲得更高的能效。最后,在由宏小區(qū)和微微小區(qū)組成的同頻異構(gòu)網(wǎng)中,提出了一種時(shí)域資源分配與低功率-幾乎空白子幀(ABS)功率分配的聯(lián)合優(yōu)化方案。該方案通過動(dòng)態(tài)協(xié)調(diào)宏小區(qū)之間、微小區(qū)之間和隸屬不同小區(qū)的宏微小區(qū)之間的干擾,解決了用戶的小區(qū)選擇問題、資源分配問題,以及低功率ABS的功率分配問題。研究結(jié)果顯示,動(dòng)態(tài)ABS功率與時(shí)域資源聯(lián)合分配方案相比靜態(tài)低功率ABS功率分配和無功率ABS方案,大大提升了整個(gè)系統(tǒng)的性能。
[Abstract]:In the future high capacity and strong coverage communication networks, the heterogeneous networks of low power stations, such as Acer station, relay station and micro base station, have received extensive attention. In the past decade, most of the studies have improved the frequency efficiency of the cell by designing different network architectures to improve the cell network throughput. The growing data requirements and ubiquitous access requirements of the foot users are in urgent need of rapid expansion of the network infrastructure, which leads to the introduction of huge energy consumption. With the introduction of low power stations, the energy consumption units of the network are also increased accordingly. So the energy efficiency of the wireless isomerism becomes more critical. In the case of service quality (QoS), it is also the trend of modern communication technology to ensure the system has high energy efficiency. The wireless resource allocation in this paper is the basic research object, combining the technology of time domain, frequency domain and power domain, with the aim of high frequency efficiency or high efficiency, and the relay network and macro micro network in the heterogeneous network. The path selection of the collaterals, the resource scheduling and distribution, the interference coordination and other algorithms are optimized. First, a carrier allocation scheme for the joint part frequency reuse and adaptive modulation (AMC) in the DF relay system is proposed. The scheme uses full duplex and dual antenna DF relay mode to improve the utilization of time slot resources, and uses AM The C technology improves the spectrum utilization by dynamically multiplexing the frequency of the base station (BS) and the relay station (RS) to improve the efficiency of the transmission rate. This combined partial frequency reuse method and the fully multiplexed relay mode can improve the system throughput compared with the single antenna half duplex relay mode. Secondly, Based on the discrete modulation level set, a joint optimization scheme of relay selection and carrier and bit allocation for non renewable relay multiuser networks is proposed. This scheme achieves the goal of improving energy efficiency by minimizing the transmission power under the condition of user rate constraints. First, a amplification and forwarding based on the target of initial problem is proposed. AF) the relay selection scheme of the relay system is low complexity. Then, according to the result of the relay selection, the relay user's two hop link is virtual to direct link, thus the relay cell problem is converted into a traditional cell problem, carrier, bit allocation. Finally, the limit of the maximum power of the relay is taken into consideration. According to the analysis results, the proposed suboptimal scheme can reduce the complexity of the initial problem algorithm and close the optimal scheme. Moreover, the relay selection scheme proposed in this paper reduces the power consumption of the system compared with the traditional relay selection scheme, and again, based on the discrete modulation level set and the opportunity network. A joint optimization scheme of relay selection and carrier and bit allocation in regenerative relay network is proposed. This scheme introduces network coding in accordance with channel state to improve spectrum utilization, and achieves the goal of improving energy efficiency by minimizing the transmission work rate per frame in the condition of user rate restriction. After selection and carrier, bit allocation is solved step by step, and a suboptimal solution is obtained. Among them, the proposed relay selection scheme in this paper makes more users choose relay, which provides more opportunities for network coding. The network coding scheme and the non network coding scheme greatly save the power consumption of the system. Then, based on the orthogonal frequency division multiplexing (OFDM) frequency selective link of DF relay and AF relay, the optimal energy allocation scheme is proposed respectively. These two schemes have shown that the optimal solution exists and is unique, considering the consumption of the circuit. Among them, the power scheme of the DF relay link uses the characteristics of DF relay decoding and forwarding. The two hop link separation is solved, and the best allocation method is selected by comparison. This method can find the optimal power solution to maximize the energy efficiency. It is the energy efficiency upper limit of the DF relay link; and the power allocation scheme of the AF relay link contains two steps. First, the carrier allocation is carried out on the basis of the channel, and the AF relay link is virtual as a frequency hopping link based on the result of the carrier pair, and then the power allocation is used by a frequency hopping link selection method. The AF relay link energy efficiency adaptive optimization method can obtain the suboptimal solution of the optimal solution. In addition, both the DF relay and the AF relay link schemes are both. The power allocation method under the restriction of rate and power is considered, and its effect on energy efficiency is analyzed. Next, a joint optimization scheme for the relay selection and power allocation of the AF relay cell downlink is proposed under the requirements of the total power and the user rate, and the virtual gain of the AF relay link will be used in the virtual gain of the relay link. The following problem is converted into a single hop cell problem, and the power allocation of the sub optimal is obtained by water injection algorithm. The algorithm can better approximate the optimal solution and get the lower boundary of the total energy efficiency. In addition, the power consumption of the circuit occupies a large proportion in the total energy consumption of the system. In order to further economize on energy consumption and improve energy efficiency, the scheme introduces the rest and the rest of the base station. The sleep mode closes the low load sites according to the user distribution, thus obtaining higher energy efficiency with smaller capacity loss. Finally, a joint optimization scheme for time domain resource allocation and low power almost empty white subframe (ABS) power allocation is proposed in the same frequency heterogeneous network composed of macro cells and micro cells. The dynamic coordination between the macro cell, the small area and the macro microcell belonging to the different communities can solve the user's cell selection problem, the resource allocation problem, and the power allocation problem of the low power ABS. The results show that the dynamic ABS power and the time domain resource allocation scheme are compared with the static low power ABS power allocation and the power allocation scheme. The power less ABS scheme greatly improves the performance of the whole system.

【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN925

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本文編號(hào)：1836209