發(fā)布時(shí)間：2018-01-21 21:41

  本文關(guān)鍵詞： 大規(guī)模MIMO 萊斯信道 視距分量 可達(dá)速率 功率縮減　出處：《大連海事大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：傳統(tǒng)小規(guī)模多輸入多輸出(MIMO)無(wú)線通信技術(shù)已日趨成熟,但其在頻譜效率、能量效率和可靠性等方面仍存在局限性。因此,2010年Marzetta提出了大規(guī)模MIMO技術(shù),該技術(shù)通過(guò)顯著增加基站天線數(shù),以深度挖掘空間維度無(wú)線資源,改善小規(guī)模MIMO性能的局限性,提高系統(tǒng)容量。由于大規(guī)模MIMO具有能夠減小用戶發(fā)送功率有效提升系統(tǒng)性能等多方面的優(yōu)勢(shì),目前已成為5G移動(dòng)通信最具挑戰(zhàn)也是最具潛力的研究方向之一。然而這項(xiàng)技術(shù)在很多方面都處于起步階段,尤其是在萊斯信道模型下系統(tǒng)性能分析與方案設(shè)計(jì)方面。本文首先對(duì)多用戶萊斯衰落信道上行系統(tǒng)性能進(jìn)行了分析。對(duì)于系統(tǒng)具有非完美信道狀態(tài)信息(CSI)和完美CSI兩種情況,在接收端使用MRC和ZF兩種線性檢測(cè)技術(shù)進(jìn)行檢測(cè)下,詳細(xì)分析了其可達(dá)速率和功率縮減特性,并進(jìn)行仿真比較。仿真結(jié)果表明,不論是在完美CSI下還是非完美CSI下,在不減小速率性能的同時(shí)每個(gè)用戶的發(fā)送功率最多可被縮減為原來(lái)的1/M,這里M為基站天線數(shù)。隨著萊斯因子的增加,除了完美CSI下ZF檢測(cè)技術(shù)的可達(dá)速率逐漸減小且趨于一個(gè)定值,其他情況下可達(dá)速率先是逐漸增大最后趨于一個(gè)定值。為了避免導(dǎo)頻污染,本文之后提出基于視距分量(LOS)的系統(tǒng)方案,并對(duì)其速率性能進(jìn)行了分析。特別在等增益合并檢測(cè)技術(shù)下,并分析了新方案的功率縮減特性,發(fā)現(xiàn)每個(gè)用戶的發(fā)送功率最多也可被縮減為原來(lái)的1/M。接著又推廣到中繼系統(tǒng),首先給出了單對(duì)雙向放大轉(zhuǎn)發(fā)系統(tǒng)方案及其可達(dá)速率表達(dá)式并導(dǎo)出了三種功率收縮律下的速率上界表達(dá)式,然后延伸到多對(duì)系統(tǒng)中。接著對(duì)理論結(jié)果進(jìn)行仿真分析。結(jié)果表明,分別隨著中繼端天線數(shù)、萊斯因子和用戶發(fā)送功率的增加,三種功率收縮情況下的可達(dá)速率最后會(huì)趨于一個(gè)穩(wěn)定的值。當(dāng)M → ∞時(shí),在保證可達(dá)速率的同時(shí),用戶的發(fā)送功率也可以被縮減為原來(lái)的1/M,或者中繼端功率被縮減為原來(lái)的1/M。
[Abstract]:Traditional small scale MIMO (Multi-Input-Multiple-Output) wireless communication technology has become more and more mature, but its spectral efficiency, energy efficiency and reliability are still limited. In 2010, Marzetta proposed the large-scale MIMO technology, which can mine the wireless resources of spatial dimension by increasing the number of base station antennas significantly. To improve the performance of small-scale MIMO, improve the system capacity. Because of the large-scale MIMO can reduce the user transmission power and improve the system performance and other advantages. At present, it has become one of the most challenging and potential research directions for 5G mobile communication. However, this technology is still in its infancy in many aspects. Especially in the aspect of system performance analysis and scheme design under Rice channel model. Firstly, the performance of uplink system in multi-user Rice fading channel is analyzed. CSI) and perfect CSI. In the receiver using MRC and ZF two linear detection techniques to detect, the reachable rate and power reduction characteristics are analyzed in detail, and the simulation results show that. Whether in perfect CSI or imperfect CSI, the transmission power of each user can be reduced to up to 1 / M of the original without reducing the rate performance. M is the number of base station antennas. With the increase of Rice factor, the reachable rate of ZF detection technology under perfect CSI gradually decreases and tends to a fixed value. In other cases, the reachable rate increases gradually and then tends to a fixed value. In order to avoid pilot pollution, this paper proposes a system scheme based on LOS (line-of-sight component). The rate performance is analyzed, especially in the equal gain combination detection technology, and the power reduction characteristics of the new scheme are analyzed. It is found that the transmission power of each user can also be reduced to 1 / 1 / M of the original, which is then extended to the relay system. Firstly, the scheme of single-pair bidirectional amplification and forward transmission system and its reachable rate expression are given, and the rate upper bound expressions under three kinds of power contraction laws are derived. Then it is extended to the multi-pair system. Then the theoretical results are simulated and analyzed. The results show that with the increase of the antenna number of relay terminals, the Rice factor and the transmission power of the user, respectively. The reachability rate of three kinds of power shrinkage will eventually tend to a stable value. 鈫扐t 鈭，

本文編號(hào)：1452602