本文選題：緩沖輔助中繼 + 中繼選擇　； 參考：《電子科技大學(xué)》2014年碩士論文

【摘要】：中繼技術(shù)已經(jīng)成為當(dāng)前以及未來移動通信系統(tǒng)中的一項(xiàng)重要技術(shù)。傳統(tǒng)的半雙工中繼傳輸技術(shù)都是基于中繼處前一個時隙收后一個時隙發(fā)這樣交替進(jìn)行的模式。但傳統(tǒng)中繼傳輸模式受信道狀況的影響較大,即當(dāng)中繼收、發(fā)兩條鏈路其中任意一條鏈路的信道狀況比較差時,中繼處這樣的固定傳輸模式都將使得系統(tǒng)難以取得較為理想的性能。緩沖輔助的中繼傳輸技術(shù),即給予中繼一定的存儲與緩沖空間,使得中繼可以不用再遵循一收一發(fā)的固定傳輸模式,而是讓中繼在收、發(fā)信息的同時擁有了更多的自由。系統(tǒng)可以根據(jù)同一時隙不同鏈路信道狀況的好壞,以及一定的選擇算法自適應(yīng)地選擇鏈路傳輸信息。緩沖輔助中繼技術(shù)的提出,打破了原有固化的中繼傳輸機(jī)制,為中繼傳輸技術(shù)方面的研究開辟了新的領(lǐng)域。本文主要研究了緩沖輔助的中繼傳輸技術(shù),緩沖輔助的中繼傳輸技術(shù)根據(jù)中繼節(jié)點(diǎn)數(shù)量的不同主要有兩種應(yīng)用,即針對多中繼節(jié)點(diǎn)模型下的中繼選擇技術(shù),與單中繼節(jié)點(diǎn)模型下的鏈路選擇技術(shù)。首先,針對多中繼系統(tǒng),本文給出了緩沖輔助的中繼選擇技術(shù),即被選擇用來接收信息的中繼可以將信息存儲在緩沖中直到它下次被選中用來發(fā)送信息時再轉(zhuǎn)發(fā)出去,可以使得系統(tǒng)總是可以在前一個時隙選擇最優(yōu)的信源-中繼鏈路傳輸信息,在后一個時隙選擇最優(yōu)的中繼-終端鏈路轉(zhuǎn)發(fā)信息。針對無限的緩沖空間,給出了最佳最佳中繼選擇(Max-Max Relay Selection,MMRS)算法,針對有限的緩沖空間,給出了混合中繼選擇(Hybrid Relay Selection)算法。通過推導(dǎo)中斷概率,得到了雖然兩種算法與傳統(tǒng)最佳中繼選擇(Best Relay Selection,BRS)算法分集增益相同但是可以取得最高為3dB的信噪比增益的結(jié)論,并進(jìn)行了仿真驗(yàn)證。其次,針對單中繼系統(tǒng),本文提出了緩沖輔助的多用戶中繼鏈路選擇技術(shù)。因?yàn)閷?shí)際情況中,一個中繼一般需要服務(wù)多個用戶,這使得針對多用戶中繼傳輸技術(shù)的研究顯得格外有意義。緩沖輔助的多用戶中繼系統(tǒng)可以根據(jù)信道狀況的好壞自適應(yīng)地選擇當(dāng)前時隙是中繼接收信息還是中繼轉(zhuǎn)發(fā)信息,如果是中繼接收信息,中繼選擇哪一條鏈路來接收信息。具體地在緩沖空間無限大的情況下以中繼處緩沖收發(fā)數(shù)據(jù)平衡為限制條件,以系統(tǒng)和速率最大化為目標(biāo),運(yùn)用KKT條件求得基于和速率的最優(yōu)鏈路選擇算法,并提出了形式與之類似的次優(yōu)鏈路選擇算法。在緩沖空間有限大的情況下,也提出了對應(yīng)的鏈路選擇算法。最后通過仿真分析了不同鏈路選擇算法的吞吐量以及緩沖空間為有限大的情況下的系統(tǒng)時延。接著,在已提出的緩沖輔助的多用戶中繼系統(tǒng)鏈路選擇技術(shù)的基礎(chǔ)上,通過對次優(yōu)鏈路選擇技術(shù)的中斷事件的分析,推導(dǎo)了中斷概率上界的表達(dá)式,以及固定速率下滿足緩沖收發(fā)平衡的門限值計算公式。證明了緩沖輔助的多用戶中繼系統(tǒng)相比于傳統(tǒng)的多用戶中繼系統(tǒng)取得了明顯的分集增益,并通過仿真驗(yàn)證了上述結(jié)論。
[Abstract]:Relay technology has become an important technology in the current and future mobile communication systems. The traditional semi duplex relay transmission technology is based on the alternating current mode in the previous slot of the relay, but the traditional relay transmission mode is greatly affected by the channel condition, that is, it is followed by two links. When the channel condition of any link is poor, the fixed transmission mode in the relay will make the system difficult to achieve more ideal performance. The buffer assisted relay transmission technology, that is, gives the relay a certain storage and buffer space, so that the relay can not follow a fixed transmission mode, but let relay the relay. It has more freedom while receiving and sending information. The system can adaptively select link transmission information according to the condition of different link channels in the same time slot and a certain selection algorithm. Buffer auxiliary relay technology is proposed, which breaks the original curing relay transmission mechanism and opens up the research of relay transmission technology. This paper mainly studies the buffer assisted relay transmission technology. The buffer assisted relay transmission technology has two main applications based on the number of relay nodes, that is, the relay selection technique under the multi relay node model and the chain path selection technique under the single relay node model. A relay selection technique for buffer assistance is given, that is, a relay selected to receive information can store information in a buffer until the next time it is selected for sending information. It can make the system always select the best source to relay link to transmit information at the previous time slot and choose the best in the latter time slot. The optimal relay selection (Max-Max Relay Selection, MMRS) algorithm for infinite buffer space is given. A hybrid relay selection (Hybrid Relay Selection) algorithm is given for the limited buffer space. The two algorithms and the traditional optimal relay selection are obtained by deducing the broken probability. The Best Relay Selection (BRS) algorithm has the same diversity gain but can obtain the maximum signal to noise ratio gain of 3dB, and the simulation verification is carried out. Secondly, this paper proposes a buffer assisted multi user relay link selection technique for the single relay system. In the actual situation, a relay usually needs to serve multiple users, It makes it very meaningful to study the multi user relay transmission technology. The buffer assisted multi user relay system can adaptively select the current slot as the relay receiving information or relay forwarding information according to the channel condition. If the relay receives information, the relay selects which link to receive information. Under the condition that the buffer space is infinitely large, the optimal link selection algorithm based on and rate is obtained by using KKT conditions to maximize the system and rate, and a suboptimal link selection algorithm, which is similar to it, is proposed. In the end, the throughput of the different link selection algorithms and the system delay in the case of limited buffer space are analyzed by simulation. Then, on the basis of the proposed buffer assisted multi user relay system link selection technology, the analysis of the interruption events of the suboptimal chain route selection technique is derived. The expression of the upper bound of the interruption probability and the threshold value calculation formula which satisfies the buffer balance at the fixed rate prove that the buffer auxiliary multiuser relay system has obtained a distinct diversity gain compared to the traditional multiuser relay system, and the above conclusion is verified by simulation.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.5

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