本文選題：認(rèn)知中繼網(wǎng)絡(luò) + 能量采集　； 參考：《揚(yáng)州大學(xué)》2017年碩士論文

【摘要】：如今,隨著無線通信技術(shù)的發(fā)展,各種無線通信應(yīng)用以及無線通信設(shè)備也不斷涌現(xiàn)。這就使得無線通信業(yè)務(wù)呈現(xiàn)出爆炸式增長(zhǎng)趨勢(shì),導(dǎo)致頻譜資源短缺,進(jìn)一步造成了無線鏈路堵塞的嚴(yán)重現(xiàn)象。同時(shí)無線業(yè)務(wù)量的增加使得無線用戶或無線設(shè)備的能量消耗問題日益嚴(yán)重。如何在提高無線通信系統(tǒng)的頻譜利用率的同時(shí)減少能量消耗是目前亟需解決的問題之一。本文的研究是基于能量采集的認(rèn)知中繼網(wǎng)絡(luò)技術(shù)。認(rèn)知無線電技術(shù)與協(xié)作通信技術(shù)融合即認(rèn)知中繼網(wǎng)絡(luò)技術(shù),不僅具有高分集增益的優(yōu)勢(shì),而且提高了頻譜資源的利用率。而無線能量采集技術(shù),即從周圍的無線頻率信號(hào)中采集能量,為能量有效、持續(xù)的利用提供了一定的保障。而將無線能量采集技術(shù)與認(rèn)知中繼網(wǎng)絡(luò)融合,不僅解決的頻譜資源短缺的問題,而且提高了系統(tǒng)的能量效率問題。本文主要研究是基于無線能量采集與無線通信協(xié)議下認(rèn)知中繼網(wǎng)絡(luò)在不同衰落環(huán)境下系統(tǒng)的中斷性能。概括的講本文研究的主要內(nèi)容體現(xiàn)在以下幾個(gè)方面:對(duì)于認(rèn)知單向中繼網(wǎng)絡(luò),研究其在較為復(fù)雜的η-μ衰落環(huán)境下的中斷傳輸性能,獲得了η-μ衰落信道下單向認(rèn)知中繼通信系統(tǒng)的中斷概率的一些新的結(jié)果。具體為:對(duì)于主用戶得到了適用于整數(shù)衰落參數(shù)下的中斷概率的閉合表達(dá)式,而對(duì)于次用戶則獲得了適用于整數(shù)衰落參數(shù)下中斷概率的積分形式精確解。數(shù)值和仿真結(jié)果驗(yàn)證了理論分析的準(zhǔn)確性,所有的理論結(jié)果可用來指導(dǎo)η-μ衰落信號(hào)下基于能量采集的認(rèn)知單向中繼通信系統(tǒng)的設(shè)計(jì)和優(yōu)化。對(duì)于認(rèn)知單向多中繼通信系統(tǒng),研究其在Rayleigh衰落信道下的傳輸性能,根據(jù)認(rèn)知中繼中采集能量最大的中繼選擇策略,分別推導(dǎo)了主用戶和次用戶的中斷概率表達(dá)式。具體為:獲得了主用戶中斷概率的閉合表達(dá)式,另外獲得了次用戶中斷概率準(zhǔn)確值的表達(dá)式以及中斷概率下界的閉合表達(dá)式。實(shí)驗(yàn)結(jié)果表明,主用戶以及次用戶的中斷概率都會(huì)受到認(rèn)知中繼用戶數(shù)目的影響,當(dāng)增加中繼用戶數(shù)目的時(shí)候,兩者的中斷性能都有所提高。次用戶不需要額外的功率供應(yīng)也能取得較為合理的中斷性能。且在相同條件下次用戶中斷性能提高的幅度大于主用戶中斷性能所提高的幅度。對(duì)于認(rèn)知雙向認(rèn)知中繼系統(tǒng),在Nakagami-m衰落信道下,研究了認(rèn)知無線通信網(wǎng)絡(luò)的中斷傳輸性能。考慮到次用戶網(wǎng)絡(luò)可以從主用戶發(fā)送的無線信號(hào)中采集能量,首先我們推導(dǎo)出兩個(gè)主用戶在整數(shù)衰落參數(shù)下中斷概率的閉合表達(dá)式,其次得到了次用戶在整數(shù)衰落參數(shù)下中斷概率上界的閉合表達(dá)式。分析與仿真結(jié)果表明,認(rèn)知雙向中繼網(wǎng)絡(luò)中,次用戶也不需要額外的能量供應(yīng),且在不影響主用戶通信質(zhì)量的情況下,取適當(dāng)?shù)墓β史峙浔壤?也可以獲得較為合理的中斷性能。
[Abstract]:Nowadays, with the development of wireless communication technology, a variety of wireless communication applications and wireless communication equipment are emerging. This makes the wireless communication services show an explosive growth trend, leading to a shortage of spectrum resources, which further leads to a serious phenomenon of wireless link blocking. At the same time, the energy consumption of wireless users or wireless devices is becoming more and more serious with the increase of wireless traffic. How to improve the spectrum efficiency of wireless communication systems while reducing energy consumption is one of the problems that need to be solved. The research of this paper is based on the cognitive relay network technology of energy acquisition. The combination of cognitive radio and cooperative communication, known as cognitive relay network, not only has the advantage of high diversity gain, but also improves the utilization of spectrum resources. Wireless energy acquisition technology, that is, the acquisition of energy from the surrounding wireless frequency signals, provides a certain guarantee for the effective and sustainable use of energy. The fusion of wireless energy acquisition technology and cognitive relay network not only solves the problem of the shortage of spectrum resources, but also improves the energy efficiency of the system. This paper focuses on the interrupt performance of cognitive relay networks in different fading environments based on wireless energy acquisition and wireless communication protocols. The main contents of this paper are as follows: for cognitive unidirectional relay networks, the interrupt transmission performance in the complex 畏-渭 fading environment is studied. Some new results of outage probability for unidirectional cognitive relay systems over 畏-渭 fading channels are obtained. For the primary user, the closed expression of the interrupt probability is obtained for the integer fading parameter, while for the secondary user, the exact integral solution is obtained for the interruption probability under the integer fading parameter. Numerical and simulation results verify the accuracy of the theoretical analysis. All the theoretical results can be used to guide the design and optimization of a cognitive one-way relay communication system based on energy acquisition in 畏-渭 fading signals. For cognitive unidirectional multi-relay communication system, the transmission performance in Rayleigh fading channel is studied. According to the relay selection strategy with the largest acquisition energy in cognitive relay, the outage probability expressions of primary and secondary users are derived respectively. The main contents are as follows: the closed expression of the primary user's interrupt probability, the expression of the accurate value of the secondary user's interrupt probability and the closed expression of the lower bound of the secondary user's interrupt probability are obtained. The experimental results show that the outage probability of both primary and secondary users is affected by the number of cognitive relay users, and when the number of relay users is increased, the interrupt performance of both users is improved. Secondary users can achieve reasonable interrupt performance without additional power supply. At the same condition, the performance of the next user interrupt is larger than that of the primary user. For cognitive bidirectional cognitive relay systems, the interrupt transmission performance of cognitive wireless communication networks over Nakagami-m fading channels is studied. Considering that the secondary user network can collect energy from the wireless signal transmitted by the primary user, we first derive the closed expression of the outage probability of two primary users under integer fading parameters. Secondly, the closed expression of the upper bound of interrupt probability for secondary users under integer fading parameters is obtained. The results of analysis and simulation show that in cognitive bidirectional relay networks, secondary users also do not need additional energy supply, and take appropriate power allocation ratio without affecting the communication quality of primary users. More reasonable interrupt performance can also be obtained.
【學(xué)位授予單位】：揚(yáng)州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN925

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