發(fā)布時間：2018-08-09 20:37

【摘要】：隨著無線電系統(tǒng)不斷的加速發(fā)展,無線用戶對高可靠性、高速度、大容量的需求越來越迫切。無線協(xié)作通信根據無線通信的廣播特性在獨立的單個天線上構造虛擬天線陣列進行通信。當空間上分隔的獨立天線終端進行合作時,多天線技術的一系列重要優(yōu)點就會體現(xiàn)出來,比如分集增益,以及總是存在的從源節(jié)點到目的節(jié)點的路徑。大量的研究工作表明,協(xié)作分集的使用能夠為傳輸半徑、容量和可靠性帶來重大的潛在優(yōu)勢。在惡劣的情況下,信號的傳輸很難達到高吞吐量和低誤符號率。為了解決這個問題,研究人員提出了大量的協(xié)作策略,其中,中繼是改善信道容量和增強傳輸可靠性的主要方法。當前關于協(xié)作通信的大部分工作都集中在一個利用放大、轉發(fā)(Amplify and Forward, AF)或者解碼、轉發(fā)(Decode and Forward, DF)的協(xié)議上。在前一類協(xié)議中,中繼節(jié)點對接受信號進行放大并轉發(fā),而后一種協(xié)議下,中繼節(jié)點對接受信號進行解碼并轉發(fā)。同時,研究者們對這種協(xié)作系統(tǒng)中的中斷概率性能做了評估。 當中繼節(jié)點不能對接受信號進行連續(xù)正確地解碼時,DF協(xié)議的性能將會降低,而當中繼節(jié)點對接收到的含噪聲的信號進行放大并轉發(fā)時,AF協(xié)議的性能也將受到損失。 但是根據現(xiàn)有研究,目前基本上還沒有學者研究多中繼時的中繼協(xié)議選擇。 本文第一部分提出了一種如何選擇AF協(xié)議或DF協(xié)議的方法(ORPS),并給出了這種方法相比現(xiàn)有協(xié)議的優(yōu)勢。中繼采用如下策略持續(xù)工作：當中繼可以對接收到的信號進行完全正確的解碼時,該中繼解碼并轉發(fā)該信號；當中繼不能正確解碼信號時,剩余的中繼將在空閑周期內放大并轉發(fā)信息。這樣,中繼節(jié)點可以根據本文提出的ORPS來高效地轉發(fā)從源節(jié)點到目的節(jié)點的信號。 在此基礎上,本文對比了ORPS策略和僅使用單一AF協(xié)議時的誤符號率(SER)性能進行了比較。結果表明：相對于只采用AF方式的協(xié)議,ORPS策略表現(xiàn)出了相當優(yōu)異的性能,擁有約2dB的優(yōu)勢。更重要的是,本文提出的機制達到了滿分集增益。 在ORPS策略的基礎上,本文進一步研究了當中繼節(jié)點受到相鄰節(jié)點的同頻干擾問題,其中,干擾信號是其他發(fā)送節(jié)點同其目的節(jié)點通信時產生的。本文對不同中繼及不同干擾功率下的ORPS策略和DF協(xié)議進行了對比。
[Abstract]:With the rapid development of radio system, the demand of wireless users for high reliability, high speed and large capacity is more and more urgent. Wireless cooperative communication constructs a virtual antenna array on a single antenna according to the broadcast characteristics of wireless communication. When spatially separated independent antenna terminals cooperate a series of important advantages of multi-antenna technology such as diversity gain and the path from source node to destination node always exist. A large number of studies have shown that the use of cooperative diversity can bring significant potential advantages for transmission radius, capacity and reliability. Under bad conditions, it is difficult to achieve high throughput and low symbol error rate. In order to solve this problem, researchers put forward a large number of cooperative strategies, among which relay is the main method to improve channel capacity and enhance transmission reliability. Most of the current work on cooperative communication focuses on a protocol that utilizes amplification, forwarding (Amplify and Forward, AF) or decoding, forwarding (Decode and Forward, DF). In the former protocol, the relay node amplifies and forwards the received signal. In the latter protocol, the relay node decodes and forwards the received signal. At the same time, the researchers evaluated the outage probability performance in the collaboration system. When the relay node can not decode the received signal continuously and correctly, the performance of the DF protocol will be degraded, and the performance of the AF protocol will also be lost when the relay node amplifies and forwards the received noise-contained signal. However, according to the existing research, there are no scholars to study the relay protocol selection for multi-relay. In the first part of this paper, we propose a method of choosing AF protocol or DF protocol, (ORPS), and give the advantages of this method compared with the existing protocol. The relay continues to work as follows: when the relay can decode the received signal correctly, the relay decodes and forwards the signal; when the relay fails to decode the signal correctly, The rest of the relay will amplify and forward the information during the idle period. In this way, the relay node can transmit the signal from the source node to the destination node efficiently according to the ORPS proposed in this paper. On this basis, the performance of ORPS strategy is compared with that of (SER) with only single AF protocol. The results show that compared with AF protocol, ORPS has excellent performance and has the advantage of about 2dB. More importantly, the proposed mechanism achieves full diversity gain. Based on the ORPS strategy, this paper further studies the co-frequency interference between the relay nodes and the adjacent nodes, where the interference signals are generated when the other transmitting nodes communicate with their destination nodes. In this paper, the ORPS strategy and DF protocol under different relay and different interference power are compared.
【學位授予單位】：華中科技大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TN92

【相似文獻】

相關期刊論文 前10條

1 ;Doubly selective fading channel estimation in MIMO OFDM systems[J];Science in China(Series F:Information Sciences);2005年06期

2 ;Optimal training sequences for MIMO systems under correlated fading[J];Journal of Systems Engineering and Electronics;2008年01期

3 ;Closed-form expressions for outage probability of decode-and-forward relaying over Nakagami-m fading channels[J];The Journal of China Universities of Posts and Telecommunications;2010年02期

4 ;Waiting time in block fading MIMO systems with dynamic-depth interleaving[J];Science China(Information Sciences);2010年08期

5 ;Compressed sensing based channel estimation for fast fading OFDM systems[J];Journal of Systems Engineering and Electronics;2010年04期

6 Bing Du;Xiaoming Tao;;Independent component analysis to physical-layer network coding over wireless fading channels[J];Journal of Systems Engineering and Electronics;2013年02期

7 楊元喜;高為廣;;兩種漸消濾波與自適應抗差濾波的綜合比較分析(英文)[J];Geo-Spatial Information Science;2007年03期

8 ;ERGODIC CAPACITY ANALYSIS FOR SIMO COGNITIVE FADING CHANNEL IN SPECTRUM SHARING ENVIRONMENT[J];Journal of Electronics(China);2010年05期

9 ;Some Performances Evaluation for Cellular DS-SFH Systems[J];電波科學學報;1998年03期

10 ;A NEW ML DETECTION ALGORITHM FOR ORTHOGONAL MULTICODE SYSTEM IN NAKAGAMI FADING CHANNEL[J];Journal of Electronics;2006年02期

相關會議論文 前7條

1 Lei Chen;Shuai Han;Weixiao Meng;;The Performance Analysis of Acquisition for GNSS Signal over Frequency Non-selective Fading Channel[A];第五屆中國衛(wèi)星導航學術年會論文集-S7 北斗/GNSS用戶終端技術[C];2014年

2 哀微;;A New Macroscopic Multiple Input Multiple Output (MIMO) System[A];2005通信理論與技術新進展——第十屆全國青年通信學術會議論文集[C];2005年

3 ;The Analysis and Simulation of Multipath Error Fading Characterization in Different Satellite Orbits[A];第三屆中國衛(wèi)星導航學術年會電子文集——S06北斗/GNSS測試評估技術[C];2012年

4 ;Synchronization Technology Research based on BOC Modulation[A];第三屆中國衛(wèi)星導航學術年會電子文集——S02衛(wèi)星導航信號體制及兼容與互操作[C];2012年

5 趙婧;;A New Design Of Unitary Space-time Constellations[A];2006通信理論與技術新進展——第十一屆全國青年通信學術會議論文集[C];2006年

6 Yong Li;Rong Zong;Jiang Yu;Ling Zhao;Peng Li;;Dual Networks Model for Lower Error and Delay Using RS-CRC Encoding[A];2013年中國智能自動化學術會議論文集（第一分冊）[C];2013年

7 梁棟;林家儒;;Research on Required Data Number in Flat Fast Fading Channel Simulation[A];2006通信理論與技術新進展——第十一屆全國青年通信學術會議論文集[C];2006年

相關博士學位論文 前1條

1 艾德銳（Edriss Eisa Babikir Adam）;衰落信道中無線中繼技術的分析與性能評估[D];華中科技大學;2014年

相關碩士學位論文 前2條

1 Ahmed Mohamed Ali Abdelrahman;[D];湖南大學;2011年

2 Farhana Kabir;[D];華中科技大學;2008年

，

本文編號：2175244