本文選題：無線攜能通信 + 無線能量傳輸　； 參考：《東南大學(xué)》2017年博士論文

【摘要】：無線攜能通信(Simultaneous Wireless Information and Power Transfer,SWIPT)是無線通信技術(shù)與無線能量傳輸技術(shù)交叉融合的一個(gè)前沿?zé)狳c(diǎn)研究方向,其利用射頻(RF)信號(hào)實(shí)現(xiàn)信息與能量的并行傳輸,是解決無線網(wǎng)絡(luò)能量受限問題以及實(shí)現(xiàn)綠色通信的重要途徑,已引起學(xué)術(shù)界和工業(yè)界的廣泛關(guān)注。然而,SWIPT系統(tǒng)面臨著信道衰落和安全通信等方面的嚴(yán)峻挑戰(zhàn)。因此,研究如何實(shí)現(xiàn)SWIPT系統(tǒng)高效的能量傳輸以及安全的信息傳輸具有重要的現(xiàn)實(shí)意義。在傳統(tǒng)無線網(wǎng)絡(luò)中,多天線預(yù)編碼技術(shù)可以有效減小信道衰落帶來的影響,而物理層安全技術(shù)可以保證通信的安全性。因此,結(jié)合多天線預(yù)編碼技術(shù)和物理層安全技術(shù),本論文主要研究了 MISO SWIPT系統(tǒng)中基于能量獲取比例公平的波束成形,MIMO SWIPT系統(tǒng)中基于安全能效最大化的預(yù)編碼,具有秘密消息的MISO SWIPT廣播信道安全傳輸方案,具有額外竊聽者及秘密消息的MISO SWIPT廣播信道安全傳輸方案,無線能量傳輸與認(rèn)知無線電共存場(chǎng)景下的協(xié)作預(yù)編碼,無線能量傳輸與無線信息傳輸共存場(chǎng)景下的多目標(biāo)預(yù)編碼。具體研究?jī)?nèi)容和主要貢獻(xiàn)如下:1.針對(duì)多用戶MISO SWIPT系統(tǒng)中存在能量獲取不均衡的問題,提出了一種基于能量獲取比例公平的波束成形設(shè)計(jì)方案。通過優(yōu)化波束成形矢量,所提方案在滿足信息接收者的信干噪比和發(fā)送者的最大發(fā)送功率等約束的基礎(chǔ)上可以實(shí)現(xiàn)能量獲取的比例公平。此設(shè)計(jì)在數(shù)學(xué)上是一個(gè)很難直接求解的非凸優(yōu)化問題。為此,我們首先將原優(yōu)化問題等價(jià)為容易處理的上鏡圖形式,然后利用半定松弛技術(shù)將對(duì)應(yīng)的非凸優(yōu)化問題轉(zhuǎn)化為凸優(yōu)化問題。另外,在發(fā)送者僅知道部分信道狀態(tài)信息的情況下,我們進(jìn)一步采用最差性能最優(yōu)的方法對(duì)原優(yōu)化問題進(jìn)行了魯棒波束成形設(shè)計(jì)。仿真結(jié)果表明,所提波束成形方案可以實(shí)現(xiàn)能量獲取的比例均衡。2.針對(duì)三節(jié)點(diǎn)MIMO SWIPT竊聽系統(tǒng),提出了一種安全能量效率優(yōu)先的預(yù)編碼傳輸方案。SWIPT系統(tǒng)中以安全能量效率為設(shè)計(jì)準(zhǔn)則的預(yù)編碼設(shè)計(jì)仍是一個(gè)開放性問題,類比于傳統(tǒng)無線網(wǎng)絡(luò)中能量效率的定義,本文將安全能量效率定義為系統(tǒng)的最大可達(dá)安全速率除以系統(tǒng)的總消耗功率。該預(yù)編碼設(shè)計(jì)方案可以在滿足安全速率、能量獲取以及最大發(fā)送功率等約束的基礎(chǔ)上最大化系統(tǒng)的安全能量效率。非凸安全速率約束導(dǎo)致原優(yōu)化問題很難求解。為此,提出了一個(gè)基于一階泰勒級(jí)數(shù)展開的迭代算法,并證明了所提迭代算法的收斂性。仿真結(jié)果表明,所提算法可以實(shí)現(xiàn)安全能量效率的最大化,并且在小發(fā)送功率區(qū)域,該算法還可以同時(shí)最大化系統(tǒng)的安全速率。3.考慮了具有保密消息的MISO SWIPT廣播信道場(chǎng)景,并提出了一個(gè)基于總發(fā)送功率最小化的安全傳輸方案。該方案通過聯(lián)合優(yōu)化發(fā)送波束成形矢量、噪聲協(xié)方差矩陣以及接收者功率劃分因子,在滿足每個(gè)接收者的安全速率和能量獲取約束的基礎(chǔ)上實(shí)現(xiàn)總發(fā)送功率最小化。同時(shí),提出了一個(gè)基于兩階段優(yōu)化的迭代算法來求解原優(yōu)化問題。具體來講,首先固定每個(gè)接收者的信干噪比進(jìn)而通過半定松弛技術(shù)得到對(duì)應(yīng)問題的全局最優(yōu)解,然后通過欠維窮舉搜索的方式獲得原優(yōu)化問題的最優(yōu)解。另外,考慮到K維窮舉搜索的運(yùn)算復(fù)雜度過高,進(jìn)一步提出了一個(gè)基于遺傳算法的低復(fù)雜度次優(yōu)算法來求解原優(yōu)化問題。4.針對(duì)具有保密消息的MISO SWIPT廣播信道中發(fā)送者發(fā)送給每個(gè)接收者的秘密消息還有可能被額外竊聽者竊聽的問題,進(jìn)一步研究了具有額外竊聽者及秘密消息的MISO SWIPT系統(tǒng)的安全傳輸方案設(shè)計(jì)。該方案以最小化系統(tǒng)的總發(fā)送功率為設(shè)計(jì)目標(biāo),同時(shí)考慮每個(gè)接收者的安全速率和能量獲取要求。類似地,首先提出了一個(gè)基于兩階段優(yōu)化的算法來處理原非凸優(yōu)化問題,然后進(jìn)一步提出了,一個(gè)基于粒子群算法的低復(fù)雜度次優(yōu)算法。隨后,將上述安全波束設(shè)計(jì)推廣到合作竊聽的情況。所謂合作竊聽是指額外竊聽者和潛在竊聽者組成一個(gè)虛擬的多天線竊聽者,從而保密消息面臨更為嚴(yán)重的安全威脅。此情況下約束集中包含行列式函數(shù),因此對(duì)應(yīng)優(yōu)化問題的求解面臨更大的挑戰(zhàn)。基于兩階段優(yōu)化的框架,本文通過采用基本的矩陣不等式結(jié)果以及半定松弛技術(shù)對(duì)相應(yīng)的優(yōu)化問題進(jìn)行了有效的求解。最后,考慮發(fā)送者僅知道部分信道狀態(tài)信息的情況,進(jìn)一步提出了魯棒安全傳輸方案設(shè)計(jì)。5.考慮了無線能量傳輸系統(tǒng)與認(rèn)知無線電系統(tǒng)共存的場(chǎng)景,并設(shè)計(jì)了一種積極利用同頻干擾的協(xié)作預(yù)編碼傳輸方案。與傳統(tǒng)的無線通信網(wǎng)絡(luò)不同,此場(chǎng)景下同頻干擾被視為有益的資源而不是有害的因素。具體來講,認(rèn)知無線電系統(tǒng)中的次用戶產(chǎn)生的同頻干擾對(duì)無線能量傳輸系統(tǒng)中的能量接收者來說是一個(gè)能量源,因此此同頻干擾為有益的。同時(shí),無線能量傳輸系統(tǒng)中的能量發(fā)送者產(chǎn)生的同頻干擾對(duì)認(rèn)知無線電系統(tǒng)來說是一種人工噪聲,可以幫助其實(shí)現(xiàn)安全通信,因此也是有益的。針對(duì)此場(chǎng)景,所提協(xié)作預(yù)編碼傳輸方案以和發(fā)送功率最小化為設(shè)計(jì)準(zhǔn)則,同時(shí)考慮認(rèn)知無線電系統(tǒng)中次用戶的安全速率、主用戶的干擾溫度以及無線能量傳輸系統(tǒng)中能量接收者的能量獲取等要求。通過利用一階泰勒級(jí)數(shù)展開和拉格朗日對(duì)偶分解的方法,提出了一個(gè)迭代算法來求解原設(shè)計(jì)對(duì)應(yīng)的非凸優(yōu)化問題。此外,證明了所提算法可以單調(diào)收斂到原優(yōu)化問題的一個(gè)KKT點(diǎn),并分析了所提算法的復(fù)雜度。仿真結(jié)果表明,所提協(xié)作預(yù)編碼設(shè)計(jì)方案可以同時(shí)減小次用戶的發(fā)送功率以及能量發(fā)送者的發(fā)送功率。6.針對(duì)無線能量傳輸與無線信息傳輸共存場(chǎng)景下多個(gè)設(shè)計(jì)目標(biāo)之間存在沖突的問題,提出了一種多目標(biāo)預(yù)編碼傳輸方案設(shè)計(jì)來平衡此共存場(chǎng)景下多個(gè)設(shè)計(jì)目標(biāo)之間的沖突。具體來講,基于多目標(biāo)優(yōu)化框架,將安全傳輸協(xié)方差設(shè)計(jì)建模成多目標(biāo)優(yōu)化問題,從而可以實(shí)現(xiàn)無線能量傳輸系統(tǒng)中的獲取能量和無線信息傳輸系統(tǒng)中的安全速率同時(shí)最大化。為求解此非凸多目標(biāo)優(yōu)化問題,本文首先得到其對(duì)應(yīng)的烏托邦點(diǎn)。然后,利用加權(quán)和以及加權(quán)切比雪夫的方法將原多目標(biāo)優(yōu)化問題轉(zhuǎn)化為兩個(gè)單目標(biāo)優(yōu)化問題,并設(shè)計(jì)了求解每個(gè)單目標(biāo)優(yōu)化問題的迭代算法。另外,進(jìn)一步提出了一個(gè)基于非合作博弈的分布式預(yù)編碼設(shè)計(jì),并證明了納什均衡解的存在性和唯一性。
[Abstract]:Simultaneous Wireless Information and Power Transfer (SWIPT) is a hot research direction in the cross fusion of wireless communication technology and wireless energy transmission technology. It uses radio frequency (RF) signal to realize the parallel transmission of information and energy. It is a problem of solving the problem of wireless network energy limitation and realizing green communication. An important approach has attracted wide attention from academic and industrial circles. However, SWIPT systems are facing severe challenges in channel fading and security communication. Therefore, it is important to study how to achieve efficient energy transmission and secure information transmission in SWIPT systems. In traditional wireless networks, multi antenna precoding techniques are used. It can effectively reduce the influence of channel fading, and the physical layer security technology can guarantee the security of communication. Therefore, combining multi antenna precoding and physical layer security technology, this paper mainly studies the beamforming based on energy gain proportional fairness in the MISO SWIPT system, and the MIMO SWIPT system is based on the maximum security energy efficiency. Precoding, MISO SWIPT broadcast channel security transmission scheme with secret message, MISO SWIPT broadcast channel security transmission scheme with additional eavesdropper and secret message, cooperative precoding under the coexistence scene of wireless energy transmission and cognitive radio, multi target preconditioning under the coexistence scene of wireless energy transmission and wireless information transmission The specific research content and main contributions are as follows: 1. in view of the problem of unbalanced energy acquisition in the multiuser MISO SWIPT system, a beamforming scheme based on energy gain proportional fairness is proposed. By optimizing the beamforming vector, the proposed scheme satisfies the signal to noise ratio of the receiver and the maximum sender's hair. This design is a non convex optimization problem which is difficult to solve directly in mathematics. For this reason, we first equip the original optimization problem as an easy to handle form of the upper mirror, and then transform the corresponding non convex optimization problem into a convex optimization question by using the semidefinite relaxation technique. In addition, in the case that the sender only knows some channel state information, we use the worst performance optimal method to carry out robust beamforming design for the original optimization problem. The simulation results show that the proposed beamforming scheme can achieve the proportional balance.2. of the energy acquisition for three node MIMO SWIPT eavesdropping system. A precoding scheme of secure energy efficiency precoding scheme.SWIPT system with security energy efficiency as the design criterion is still an open problem, which is analogous to the definition of energy efficiency in traditional wireless networks. In this paper, the security energy efficiency is defined as the maximum reachable security rate of the system by the total system consumption. Power. The precoding scheme can maximize the security energy efficiency of the system on the basis of satisfying the constraints of security rate, energy acquisition and maximum transmission power. The original optimization problem is difficult to be solved by non convex security rate constraints. An iterative algorithm based on first order Taylor series expansion is proposed, and the proposed algorithm is proved to be proposed. The convergence of the iterative algorithm shows that the proposed algorithm can maximize the efficiency of security energy, and the algorithm can simultaneously maximize the security rate.3. of the system to consider the MISO SWIPT broadcast channel scene with the secret message at the small transmission power region, and propose a minimum total transmission power based on the minimization of the total transmission power. The scheme is designed to minimize the total transmission power by combining the beam forming vector, the noise covariance matrix and the receiver power division factor by joint optimization, and to minimize the total transmission power on the basis of each receiver's safety rate and energy acquisition constraints. At the same time, an iterative algorithm based on two phase optimization is proposed to solve the original. In particular, firstly, the SNR of each receiver is fixed, and then the global optimal solution of the corresponding problem is obtained by the semidefinite relaxation technique, and then the optimal solution of the original optimization problem is obtained by the way of the underdimension exhaustive search. In addition, considering the high complexity of the K dimension exhaustive search, a further based on the remains is proposed. The low complexity suboptimal algorithm for the transmission algorithm to solve the original optimization problem.4., the security transmission of the secret message sent to each recipient in the MISO SWIPT broadcast channel with confidential messages and the eavesdropper of the additional eavesdropper is further studied. The secure transmission of the MISO SWIPT system with the additional eavesdropper and secret message is further studied. The scheme is designed to minimize the total transmission power of the system as a design goal, while taking into account the safety rate and energy requirements of each recipient. Similarly, a two phase optimization algorithm is proposed to deal with the original non convex optimization problem. Then, a low complexity based on particle swarm optimization is proposed. Suboptimal algorithm. Then, the above security beam design is extended to cooperative eavesdropping. The so-called cooperative eavesdropping refers to a virtual multi antenna eavesdropper consisting of additional listeners and potential eavesdroppers, and the secret message faces a more serious security threat. In this case, the constraint focus contains the determinant function and therefore corresponds to the optimization problem. Based on the two stage optimization framework, this paper makes an effective solution to the corresponding optimization problem by using the basic matrix inequalities and semidefinite relaxation technique. Finally, considering the sender only knowing the state information of the partial channel state, the robust secure transmission scheme.5. is further proposed. Considering the coexistence of wireless energy transmission system and cognitive radio system, a cooperative precoding transmission scheme which actively uses the same frequency interference is designed. Unlike the traditional wireless communication network, the same frequency interference is considered as a useful resource rather than a harmful factor. The same frequency interference generated by the user is an energy source for the energy receiver in the wireless energy transmission system. Therefore, the same frequency interference is beneficial. At the same time, the same frequency interference produced by the energy sender in the wireless energy transmission system is a kind of human noise to the cognitive radio system, which can help it to realize secure communication. It is also beneficial. For this scenario, the proposed cooperative precoding transmission scheme is designed to minimize the transmission power, considering the security rate of the secondary users in the cognitive radio system, the interference temperature of the main user and the energy receiver in the wireless energy transmission system. By using the first order Taylor series expansion. An iterative algorithm is proposed to solve the non convex optimization problem of the original design. In addition, it is proved that the proposed algorithm can converge to a KKT point of the original optimization problem monotonically, and the complexity of the proposed algorithm is analyzed. The simulation results show that the proposed cooperative precoding scheme can be reduced at the same time. The transmission power of small subscribers and the transmission power of energy sender.6. are in conflict with multiple design targets in the scene of wireless energy transmission and wireless information transmission. A multi target precoding transmission scheme is designed to balance the conflicts between multiple design targets in this coexistence scene. Based on the multi-objective optimization framework, the covariance design of the secure transmission is modeled as a multi-objective optimization problem, which can achieve the simultaneous maximization of the security rate in the acquisition energy and the wireless information transmission system in the wireless energy transmission system. By using the weighted sum and weighted Chebyshev method, the original multi-objective optimization problem is transformed into two single objective optimization problems, and an iterative algorithm for solving each single objective optimization problem is designed. In addition, a distributed precoding design based on non cooperative game is proposed, and the existence and uniqueness of the Nash equilibrium solution are proved. One sex.

【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN92;TM724

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