本文選題：混合網(wǎng)絡(luò)　切入點(diǎn)：頻譜感知　出處：《北京郵電大學(xué)》2014年博士論文

【摘要】：隨著無(wú)線通信技術(shù)的發(fā)展,無(wú)線網(wǎng)絡(luò)環(huán)境日益復(fù)雜,混合網(wǎng)絡(luò)的概念由此提出,用于定義傳統(tǒng)蜂窩網(wǎng)絡(luò)與終端直通網(wǎng)絡(luò)共存的無(wú)線混合式網(wǎng)絡(luò)場(chǎng)景。該場(chǎng)景下的研究意義有二：理論方面,在頻譜資源日益緊張的情況下,場(chǎng)景中重用頻譜的通信方式可以有效提高頻譜利用率；實(shí)際應(yīng)用方面,該場(chǎng)景符合運(yùn)營(yíng)商的利益,終端到基站的鏈路減少,不但使得鏈路間干擾減少,而且也減少重復(fù)發(fā)送相同數(shù)據(jù)的鏈路,從而提高頻譜的實(shí)際利用率。 本文正是研究蜂窩終端直通混合網(wǎng)絡(luò)中動(dòng)態(tài)無(wú)線頻譜資源的高效利用問(wèn)題。針對(duì)混合網(wǎng)絡(luò)場(chǎng)景中的頻譜檢測(cè)技術(shù)、基站輔助的半集中式頻譜共享技術(shù)、以及聯(lián)合終端直通用戶的功率控制與頻譜接入的分布式資源調(diào)度相關(guān)技術(shù)三個(gè)方面,以提高以提升混合網(wǎng)絡(luò)整體性能為目標(biāo),研究高效利用頻譜資源的方法。首先,本文針對(duì)寬頻帶信號(hào)的能量檢測(cè)技術(shù),設(shè)計(jì)了最優(yōu)的門限判決準(zhǔn)則；隨后,針對(duì)混合網(wǎng)絡(luò)中上行頻譜資源共享的場(chǎng)景,設(shè)計(jì)了可以同時(shí)體現(xiàn)兩種終端用戶比例公平性在基站輔助模式下的調(diào)度策略；最后,針對(duì)混合網(wǎng)絡(luò)直通終端頻譜接入的場(chǎng)景,為終端直通用戶設(shè)計(jì)了分布式聯(lián)合信道功率控制與頻譜選擇接入的調(diào)度策略。論文主要?jiǎng)?chuàng)新性工作如下： 第一,為了實(shí)現(xiàn)終端直通用戶重用蜂窩頻譜資源進(jìn)行通信,研究了蜂窩終端直通混合網(wǎng)絡(luò)中的頻譜感知技術(shù)：首先,針對(duì)寬頻帶信號(hào),結(jié)合虛警概率門限和檢測(cè)概率門限,并利用最小代價(jià)函數(shù)推導(dǎo)出最小代價(jià)門限的閉式解,并在檢測(cè)性能約束的條件下分析出性能指標(biāo)對(duì)能量檢測(cè)最優(yōu)判決門限的限制；其次結(jié)合時(shí)域上的觀測(cè)時(shí)長(zhǎng)對(duì)最小代價(jià)門限的約束,設(shè)計(jì)了最優(yōu)的判決門限準(zhǔn)則；最后通過(guò)之后的數(shù)值仿真以及對(duì)觀測(cè)時(shí)長(zhǎng)進(jìn)行分段的檢測(cè)性能分析驗(yàn)證了提出的判決門限準(zhǔn)則的最優(yōu)性。 第二,研究了基于獲取上述頻譜感知信息的基礎(chǔ)上,混合網(wǎng)絡(luò)中蜂窩用戶與終端直通用戶的上行頻譜資源的共享機(jī)制,設(shè)計(jì)了一種基站輔助下同時(shí)為兩類終端用戶分配頻譜資源與功率的策略：首先,通過(guò)把資源分配問(wèn)題建模為兩類終端的和速率最大化的優(yōu)化問(wèn)題,其約束條件中設(shè)置了終端直通用戶的用戶速率要求保障機(jī)制,用以實(shí)現(xiàn)兩類用戶的比例公平調(diào)度；其次,通過(guò)拉格朗日因子算法以及KKT條件對(duì)上述問(wèn)題進(jìn)行求解,根據(jù)閉式解得出結(jié)論：對(duì)于兩類終端來(lái)說(shuō),頻譜資源的選擇與功率分配之間是互為條件選擇；最后,按照上述結(jié)論給出該策略的具體算法,并進(jìn)一步驗(yàn)證了該策略在公平性和吞吐量?jī)?yōu)異性。 第三,研究在混合網(wǎng)絡(luò)中終端直通用戶獲得頻譜感知信息之后,自主選擇接入蜂窩上行頻譜及完成功率控制對(duì)混合網(wǎng)絡(luò)性能的影響：首先,基于終端直通用戶的系統(tǒng)總吞吐量進(jìn)行最優(yōu)化數(shù)學(xué)建模,并通過(guò)以總吞吐量和接入鏈路數(shù)最大化兩種首要因素分別對(duì)最優(yōu)化問(wèn)題進(jìn)行求解；其次,按照結(jié)果設(shè)計(jì)兩種分布式終端頻譜接入選擇策略,并針對(duì)鏈路嘗試接入的兩種順序與上述策略搭配執(zhí)行,給出了相應(yīng)的分布式資源調(diào)度的具體方案：最后,為了證明所提方案的有效性,論文進(jìn)一步給出了新的調(diào)度方案策略與集中式調(diào)度策略的性能比較結(jié)果。
[Abstract]:With the development of wireless communication technology, wireless network environment is increasingly complex, the concept of hybrid network is presented, the definition of the traditional cellular network and terminal through wireless hybrid network scenarios for network coexistence. The significance of this research has two scenarios: theory, spectrum resources in the increasingly tense situation, communication scene spectrum reuse can effectively improve the spectrum utilization rate; practical application, the scene in the interest of operators, terminal to base station link reduced, not only makes the inter link interference reduction, but also reduce the repetition of the same data link to send, so as to improve the utilization of the spectrum.
This paper is a study of the cellular terminal through the efficient use of dynamic spectrum resource in hybrid network. According to the spectrum detection technology of hybrid network scene, semi centralized spectrum sharing technology base station assisted, and the joint terminal through distributed power control and spectrum resource user access scheduling technology in three aspects, in order to improve to enhance the overall performance of the hybrid network as the goal, method of spectrum resources and efficient use of research. First of all, based on the energy detection technology of wideband signal, design the optimal threshold criterion; then, for the sharing of uplink resources in a hybrid network scenario, design can also reflect the scheduling strategy of two terminal users proportional fairness in base station the auxiliary mode; finally, aiming at the hybrid network terminal through spectrum access scenario for distribution through the user terminal design Scheduling strategy for joint channel power control and spectrum selection access. The main innovative work of this paper is as follows:
First, in order to realize the reuse of spectrum resources through the user terminal cellular communication on the cellular terminal through spectrum sensing technology in hybrid network: first of all, according to the broadband signal, combined with the false alarm probability and detection probability threshold threshold, closed solution and use the minimum cost function to derive the minimum cost threshold, and the analysis of the performance limit the index of optimal decision threshold of energy detection in the detection performance constraints; secondly the length of observation time minimum cost threshold constraint, the optimal design of threshold criteria; finally, through numerical simulation and verification after the optimality of the proposed threshold criterion for performance analysis of detection segment length the observation.
Second, based on the basis of obtaining the spectrum sensing information sharing mechanism, through the uplink resources users of cellular users and terminal hybrid networks, designed a base station assisted at the same time as the two terminal user resources and power spectrum allocation strategy: first, through the resource allocation problem is modeled as optimization problems the terminal two and the maximum rate, the constraints set in the terminal through the user's user rate requirements guarantee mechanism, to realize the two kinds of users proportional fair scheduling; secondly, through the Lagrange factor algorithm and KKT condition to solve the above problems, based on the closed solution of the conclusion: for two types of terminal between, selection and power allocation of the spectrum resources are selected according to the specific conditions; finally, the conclusion is given the algorithm strategy, and further validates the strategy It is slightly better in fairness and throughput.
Third, the research in hybrid network terminal through the user access spectrum sensing information, choose the access to the cellular uplink power control and influence on the performance of the hybrid network: first, optimize the mathematical modeling through the user's terminal system based on total throughput, and through to the total throughput and access link to maximize the number of two primary factors respectively. The optimization problem is solved; secondly, according to the design of two kinds of distributed spectrum access terminal selection strategy, and for the two order and the link to access the collocation strategy implementation, a scheme of distributed resource scheduling accordingly. Finally, in order to prove the validity of the proposed scheme, the paper further gives the performance of the scheduling scheme strategy and centralized scheduling strategy of the new results.

【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.5

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本文編號(hào)：1659285