【摘要】：為了解決下一代移動(dòng)通信系統(tǒng)頻譜資源短缺的問題,一種全新的雙工方式——同時(shí)同頻全雙工獲得了關(guān)注。然而,全雙工節(jié)點(diǎn)處由發(fā)送天線到接收天線間的回路產(chǎn)生的自干擾是全雙工方式運(yùn)用所遇到的重大難題。因此,本論文主要針對(duì)全雙工系統(tǒng)中的自干擾問題展開研究。首先,本文分析了全雙工鏈路系統(tǒng)殘留自干擾模型,引入了自干擾信道估計(jì)重建法。根據(jù)自干擾信道特性,設(shè)計(jì)了特殊的導(dǎo)頻圖案并改進(jìn)了基于線性最小均方誤差(Linear Minimum Mean Square Error,LMMSE)的信道估計(jì)算法。仿真結(jié)果表明,改進(jìn)算法成功地降低了殘留自干擾并有效地改善了全雙工系統(tǒng)的自干擾抑制性能。其次,本文分析了全雙工系統(tǒng)的干擾模型。通過搭建仿真平臺(tái),對(duì)LTE全雙工系統(tǒng)進(jìn)行仿真,得出了與理論公式一致的仿真結(jié)果�；诜抡嫫脚_(tái),對(duì)比研究了全雙工和半雙工技術(shù)的信干噪比、速率等性能指標(biāo)。仿真結(jié)果表明,在速率方面,全雙工系統(tǒng)較半雙工系統(tǒng)有大幅度提升。此外,本文還設(shè)計(jì)了適用于不同系統(tǒng)負(fù)載的改進(jìn)用戶配對(duì)算法,該算法以平均速率為優(yōu)化目標(biāo),在兼顧公平性的同時(shí)充分提升了全雙工系統(tǒng)的整體性能,并通過仿真獲得了驗(yàn)證。最后,本文還研究了基于空間點(diǎn)過程的全雙工多小區(qū)網(wǎng)絡(luò),對(duì)比分析了六邊形網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)以及根據(jù)泊松點(diǎn)過程(Poisson Point Process,PPP)和Matern硬核過程Ⅱ生成的網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)的系統(tǒng)性能。通過合理設(shè)計(jì)仿真參數(shù),得出了覆蓋率以及單位面積頻譜效率等性能結(jié)果。
[Abstract]:In order to solve the problem of spectrum resource shortage in the next generation mobile communication system, a new duplex mode, simultaneous full duplex, has been paid attention to. However, the self-interference generated by the loop between the transmit antenna and the receiving antenna at the full-duplex node is a major problem in the full-duplex mode. Therefore, this thesis focuses on self-interference in full duplex systems. Firstly, the residual self interference model of full duplex link system is analyzed, and the self interference channel estimation and reconstruction method is introduced. According to the characteristics of self-interference channel, a special pilot pattern is designed and the channel estimation algorithm based on linear minimum mean square error (Linear Minimum Mean Square Error,LMMSE) is improved. Simulation results show that the improved algorithm successfully reduces the residual self-interference and effectively improves the self-interference suppression performance of the full-duplex system. Secondly, the interference model of full duplex system is analyzed. The LTE full-duplex system is simulated on a simulation platform, and the simulation results are consistent with the theoretical formula. Based on the simulation platform, the performance indexes of full duplex and half duplex technology, such as signal-to-noise ratio and rate, are compared and studied. The simulation results show that the full-duplex system can greatly improve the rate compared with the half-duplex system. In addition, this paper also designs an improved user pairing algorithm for different system loads. The algorithm takes the average rate as the optimization objective, and fully improves the overall performance of the full-duplex system while taking fairness into account. It is verified by simulation. Finally, we study the full duplex multicell network based on the spatial point process, and compare and analyze the topological structure of hexagonal network and the system performance of the network topology generated by Poisson point process (Poisson Point Process,PPP) and Matern hard core process II. Through reasonable design of simulation parameters, the performance results of coverage and spectral efficiency per unit area are obtained.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN929.5

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本文編號(hào)：2223799