發(fā)布時(shí)間：2018-08-09 20:37

【摘要】：隨著無(wú)線電系統(tǒng)不斷的加速發(fā)展,無(wú)線用戶對(duì)高可靠性、高速度、大容量的需求越來(lái)越迫切。無(wú)線協(xié)作通信根據(jù)無(wú)線通信的廣播特性在獨(dú)立的單個(gè)天線上構(gòu)造虛擬天線陣列進(jìn)行通信。當(dāng)空間上分隔的獨(dú)立天線終端進(jìn)行合作時(shí),多天線技術(shù)的一系列重要優(yōu)點(diǎn)就會(huì)體現(xiàn)出來(lái),比如分集增益,以及總是存在的從源節(jié)點(diǎn)到目的節(jié)點(diǎn)的路徑。大量的研究工作表明,協(xié)作分集的使用能夠?yàn)閭鬏敯霃健⑷萘亢涂煽啃詭?lái)重大的潛在優(yōu)勢(shì)。在惡劣的情況下,信號(hào)的傳輸很難達(dá)到高吞吐量和低誤符號(hào)率。為了解決這個(gè)問(wèn)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(qiáng)傳輸可靠性的主要方法。當(dāng)前關(guān)于協(xié)作通信的大部分工作都集中在一個(gè)利用放大、轉(zhuǎn)發(fā)(Amplify and Forward, AF)或者解碼、轉(zhuǎn)發(fā)(Decode and Forward, DF)的協(xié)議上。在前一類協(xié)議中,中繼節(jié)點(diǎn)對(duì)接受信號(hào)進(jìn)行放大并轉(zhuǎn)發(fā),而后一種協(xié)議下,中繼節(jié)點(diǎn)對(duì)接受信號(hào)進(jìn)行解碼并轉(zhuǎn)發(fā)。同時(shí),研究者們對(duì)這種協(xié)作系統(tǒng)中的中斷概率性能做了評(píng)估。 當(dāng)中繼節(jié)點(diǎn)不能對(duì)接受信號(hào)進(jìn)行連續(xù)正確地解碼時(shí),DF協(xié)議的性能將會(huì)降低,而當(dāng)中繼節(jié)點(diǎn)對(duì)接收到的含噪聲的信號(hào)進(jìn)行放大并轉(zhuǎn)發(fā)時(shí),AF協(xié)議的性能也將受到損失。 但是根據(jù)現(xiàn)有研究,目前基本上還沒(méi)有學(xué)者研究多中繼時(shí)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(shì)。中繼采用如下策略持續(xù)工作：當(dāng)中繼可以對(duì)接收到的信號(hào)進(jìn)行完全正確的解碼時(shí),該中繼解碼并轉(zhuǎn)發(fā)該信號(hào)；當(dāng)中繼不能正確解碼信號(hào)時(shí),剩余的中繼將在空閑周期內(nèi)放大并轉(zhuǎn)發(fā)信息。這樣,中繼節(jié)點(diǎn)可以根據(jù)本文提出的ORPS來(lái)高效地轉(zhuǎn)發(fā)從源節(jié)點(diǎn)到目的節(jié)點(diǎn)的信號(hào)。 在此基礎(chǔ)上,本文對(duì)比了ORPS策略和僅使用單一AF協(xié)議時(shí)的誤符號(hào)率(SER)性能進(jìn)行了比較。結(jié)果表明：相對(duì)于只采用AF方式的協(xié)議,ORPS策略表現(xiàn)出了相當(dāng)優(yōu)異的性能,擁有約2dB的優(yōu)勢(shì)。更重要的是,本文提出的機(jī)制達(dá)到了滿分集增益。 在ORPS策略的基礎(chǔ)上,本文進(jìn)一步研究了當(dāng)中繼節(jié)點(diǎn)受到相鄰節(jié)點(diǎn)的同頻干擾問(wèn)題,其中,干擾信號(hào)是其他發(fā)送節(jié)點(diǎn)同其目的節(jié)點(diǎn)通信時(shí)產(chǎn)生的。本文對(duì)不同中繼及不同干擾功率下的ORPS策略和DF協(xié)議進(jìn)行了對(duì)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(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN92

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