本文選題：下一代 + 蜂窩��； 參考：《北京郵電大學(xué)》2014年博士論文

【摘要】：在過(guò)去的幾十年中,移動(dòng)通信系統(tǒng)應(yīng)用大幅增長(zhǎng),無(wú)線蜂窩網(wǎng)絡(luò)中的數(shù)據(jù)通信更是以指數(shù)速度增長(zhǎng)。傳統(tǒng)的蜂窩網(wǎng)絡(luò)和無(wú)線技術(shù)正面臨著前所未有的挑戰(zhàn),為了滿(mǎn)足日益增長(zhǎng)的數(shù)據(jù)流量需求。下一代無(wú)線蜂窩網(wǎng)絡(luò)的目標(biāo)是滿(mǎn)足高數(shù)據(jù)傳輸速率、低延遲和高容量的要求。 提高數(shù)據(jù)傳輸速率的關(guān)鍵是提高蜂窩網(wǎng)絡(luò)的頻譜利用率。在蜂窩網(wǎng)絡(luò)中,多輸入多輸出(MIMO)技術(shù)可以顯著提高系統(tǒng)的吞吐量和頻譜利用率,且該技術(shù)已被下一代無(wú)線蜂窩網(wǎng)絡(luò)采用。然而,MIMO技術(shù)在多小區(qū)環(huán)境應(yīng)用時(shí),其增益易受較強(qiáng)小區(qū)間干擾而減小。且由于正交頻分多址(OFDMA)具有良好的擴(kuò)展性和靈活性,下一代無(wú)線蜂窩網(wǎng)絡(luò)采用OFDMAo使用OFDMA在理想情況下可以消除小區(qū)間干擾,但環(huán)境仍受有限小區(qū)間干擾的限制。除此以外,下一代無(wú)線蜂窩網(wǎng)絡(luò)中的通用頻率復(fù)用也會(huì)導(dǎo)致嚴(yán)重的小區(qū)間干擾。因此,下一代無(wú)線蜂窩網(wǎng)絡(luò)的性能從根本上受限于小區(qū)間干擾,尤其影響在小區(qū)邊緣的用戶(hù)。綜上,需要預(yù)先干擾緩解技術(shù)以提高下一代無(wú)線蜂窩網(wǎng)絡(luò)的性能。 多小區(qū)發(fā)送(Multi-cell transmission),也稱(chēng)為協(xié)調(diào)多點(diǎn)傳輸,已成為有發(fā)展前景的關(guān)鍵技術(shù),可在下一代無(wú)線蜂窩網(wǎng)絡(luò)有效地減輕小區(qū)間干擾,在提高小區(qū)邊緣用戶(hù)的吞吐量,頻譜利用率和覆蓋范圍方面也有很大的潛力。然而,多小區(qū)發(fā)送在實(shí)際系統(tǒng)中實(shí)施方面仍面臨著多種嚴(yán)峻挑戰(zhàn)和關(guān)鍵技術(shù)問(wèn)題。反饋開(kāi)銷(xiāo)、回程傳輸開(kāi)銷(xiāo)、系統(tǒng)復(fù)雜度、以及小區(qū)平均吞吐量和小區(qū)邊緣用戶(hù)吞吐量之間的協(xié)調(diào)是多小區(qū)發(fā)送中的關(guān)鍵問(wèn)題。改善和優(yōu)化多小區(qū)發(fā)送技術(shù),以有效改善下一代無(wú)線蜂窩網(wǎng)絡(luò)的小區(qū)間干擾抑制性能,成為研究重點(diǎn)。本文提出一種全新的、頻譜利用率更高的多小區(qū)傳輸方案,可以以反饋和回程傳輸開(kāi)銷(xiāo)增量最小的條件下,有效地降低小區(qū)間干擾。已有成熟的技術(shù)顯著地提高了小區(qū)邊緣用戶(hù)性能。此外,本文提出的解決方案的計(jì)算和系統(tǒng)的復(fù)雜性顯著降低。在下一階段,研究工作著重研究各種頻譜利用率,低復(fù)雜度的方案,以進(jìn)一步改進(jìn)和優(yōu)化系統(tǒng)性能,有效地降低小區(qū)間干擾,同時(shí)提高小區(qū)邊緣性能以及平均小區(qū)性能。本文所提出的解決方案可以減少反饋和回程傳輸?shù)拈_(kāi)銷(xiāo),同時(shí)降低系統(tǒng)復(fù)雜度,并且顯著提高了平均系統(tǒng)吞吐量,小區(qū)邊緣用戶(hù)吞吐量,平均頻譜利用率以及小區(qū)邊緣用戶(hù)頻譜利用率。除此之外,線性預(yù)編碼技術(shù)用也進(jìn)一步降低了統(tǒng)的計(jì)算復(fù)雜度。本文提出的解決方案對(duì)于系統(tǒng)性能的提高和系統(tǒng)復(fù)雜度提出了一個(gè)非常有效的權(quán)衡辦法,同時(shí)系統(tǒng)有更好的公平性。 在工作的最后階段,對(duì)研究進(jìn)行擴(kuò)展,有效地減小多層異構(gòu)網(wǎng)絡(luò)部署的跨層干擾。本文提出了多種全新、頻譜利用率多小區(qū)傳輸方案,有效地減小跨層的多層異構(gòu)網(wǎng)絡(luò)中的干擾。主要利用多小區(qū)發(fā)送,以減小反饋和回程傳輸開(kāi)銷(xiāo)以及系統(tǒng)復(fù)雜度的獨(dú)特方式改善和優(yōu)化異構(gòu)網(wǎng)絡(luò)的性能,并顯著減少開(kāi)銷(xiāo)和系統(tǒng)的復(fù)雜性。這有效地減小了跨層干擾并且顯著提高了小區(qū)邊緣用戶(hù)的性能。此外,通過(guò)提高頻譜利用率,降低傳輸復(fù)雜性技術(shù)從而對(duì)系統(tǒng)性能進(jìn)一步完善和優(yōu)化,同時(shí)也提高了小區(qū)邊緣性能以及平均小區(qū)多層異構(gòu)網(wǎng)絡(luò)的性能。本文提出的解決方案也減小了反饋和回程開(kāi)銷(xiāo),以及系統(tǒng)復(fù)雜性。
[Abstract]:In the past few decades, the applications of mobile communication systems have increased greatly. Data communications in wireless cellular networks have increased exponentially. Traditional cellular networks and wireless technologies are facing unprecedented challenges. In order to meet the growing demand for data traffic, the goal of the next generation of wireless cellular networks is to meet high data transmission. Transmission rate, low delay and high capacity requirements.
The key to improving the data transmission rate is to improve the spectrum utilization of cellular networks. In cellular networks, multi input and multiple output (MIMO) technology can significantly improve the throughput and spectrum utilization of the system, and the technology has been adopted by the next generation of wireless cellular networks. However, the gain of the MIMO technology is easier to be less vulnerable to the multi cell environment. Interval interference is reduced. And due to the good scalability and flexibility of orthogonal frequency division multiple access (OFDMA), next generation wireless cellular networks use OFDMAo to eliminate inter cell interference in the ideal situation using OFDMA, but the environment is still restricted by limited inter cell interference. In addition, the general frequency reuse in the next generation of wireless cellular networks As a result, the performance of the next generation wireless cellular networks is fundamentally limited to inter cell interference, especially to the users on the edge of the cell. To sum up, the performance of the next generation of wireless cellular networks needs to be interfered with in advance.
Multi cell transmission (Multi-cell transmission), also known as coordinated multipoint transmission, has become a key technology for future development. It can effectively reduce inter cell interference in the next generation of wireless cellular networks. It also has great potential to improve the throughput of cell edge users, spectrum utilization and coverage. However, multi cell transmission is real. The implementation of the system is still facing a variety of severe challenges and key technical problems. Feedback overhead, return transmission overhead, system complexity, and the coordination between cell average throughput and cell edge user throughput are the key problems in multi cell transmission. The inter cell interference suppression performance of line cellular networks is the focus of research. This paper proposes a new multi cell transmission scheme with higher spectrum utilization rate, which can effectively reduce inter cell interference with the minimum increment of feedback and return transmission overhead. The existing mature technology has significantly improved the performance of the cell edge users. In the next stage, the research work focuses on various spectrum utilization and low complexity schemes to further improve and optimize the performance of the system, effectively reduce inter cell interference, and improve cell edge performance and average cell performance. The solution can reduce the overhead of feedback and backhaul transmission, reduce the complexity of the system, and significantly improve the average system throughput, the cell edge user throughput, the average spectrum utilization and the cell edge user spectrum utilization. In addition, the Linear Precoding technology also further reduces the complexity of the system. The solution proposed in this paper provides a very effective trade-off for system performance improvement and system complexity, and at the same time, the system has better fairness.
In the last stage of the work, the research is extended to effectively reduce cross layer interference in multi-layer heterogeneous network deployment. In this paper, a variety of new, spectrum utilization multiple cell transmission schemes are proposed to effectively reduce interference in cross layer heterogeneous networks. The main use of multi cell sending is used to reduce the cost of feedback and return transmission and the system. The unique way of complexity improves and optimizes the performance of heterogeneous networks, and significantly reduces the overhead and complexity of the system. This effectively reduces the cross layer interference and significantly improves the performance of the cell edge users. In addition, the system performance is further improved and optimized by increasing the spectrum utilization and reducing the transmission complexity. It also improves the performance of the cell edge and the average cell multi-layer heterogeneous network. The proposed solution also reduces the feedback and return overhead, as well as the system complexity.
【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(lèi)號(hào)】：TN929.53

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 ;Research on uplink coordinated transmission schemes in LTE-advanced systems[J];The Journal of China Universities of Posts and Telecommunications;2011年02期

，

本文編號(hào)：2069919