本文選題：多點(diǎn)協(xié)作聯(lián)合傳輸 + 預(yù)編碼　； 參考：《福州大學(xué)》2014年碩士論文

【摘要】：多點(diǎn)協(xié)作技術(shù)(Coordinated Multi-Point, CoMP)是先進(jìn)的長期演進(jìn)(Long Term Evolution Advanced, LTE-A)提高小區(qū)邊緣用戶吞吐量和網(wǎng)絡(luò)整體數(shù)據(jù)傳輸速率的核心技術(shù)。CoMP的聯(lián)合處理方式以預(yù)編碼技術(shù)為基礎(chǔ),其解碼過程要求協(xié)作基站的信號同時(shí)到達(dá)用戶終端。實(shí)際網(wǎng)路中,用戶位置分布具有一定的隨機(jī)性和移動(dòng)性,協(xié)作基站難以根據(jù)有限的反饋信息保證信號能同時(shí)或者以較少的時(shí)延差到達(dá)用戶終端,這就產(chǎn)生了多用戶協(xié)作的異步干擾問題。目前研究學(xué)者主要通過設(shè)計(jì)有限反饋信道的預(yù)編碼方法消除異步干擾,但這些預(yù)編碼方法復(fù)雜度普遍較高。本文以先進(jìn)的壓縮感知技術(shù)為基礎(chǔ),通過合理設(shè)計(jì)低速率的壓縮采樣方案,提取感興趣信號,有效地消除異步干擾。本文首先介紹CoMP的聯(lián)合處理技術(shù),構(gòu)建結(jié)合中繼和CoMP技術(shù)的異構(gòu)網(wǎng)絡(luò)模型,分析異構(gòu)通信網(wǎng)絡(luò)模型的異步干擾問題。異步干擾是到達(dá)用戶端的協(xié)作基站信號之間的時(shí)延差而引起的,在傅里葉變換解調(diào)后會(huì)造成LTE-A信號的子載波間干擾。相關(guān)文獻(xiàn)已經(jīng)證明利用部分傅里葉變換可以有效消除子載波間干擾對系統(tǒng)的影響。本文根據(jù)現(xiàn)有文獻(xiàn)的設(shè)計(jì)思想,將快速傅里葉采樣方法從離散時(shí)間域擴(kuò)展到連續(xù)時(shí)間域中,提出了以隨機(jī)部分傅里葉變換為基礎(chǔ)的壓縮感知異步干擾抵消方法。該方法首先通過多通道的模擬信息轉(zhuǎn)換器,實(shí)現(xiàn)LTE-A信號頻譜的隨機(jī)循環(huán)移位,然后通過濾波器組提取感興趣信號,分解信號的重要頻譜,以sub-Nyquist速率采集信息,并對采集的離散信號樣本進(jìn)行部分傅里葉變換,估計(jì)包含重要信息的頻率和相應(yīng)的系數(shù)。本文采用的壓縮感知算法以部分傅里葉變換為核心,只提取子載波的主頻信息,可以有效地消除異步干擾的影響。仿真實(shí)驗(yàn)證明連續(xù)時(shí)間域傅里葉采樣系統(tǒng)能以sub-Nyquist速率接收LTE-A信號的同時(shí)有效地消除異步干擾對系統(tǒng)性能的影響。在信號的帶寬為10MHz,載頻為2GHz情況下,根據(jù)香農(nóng)定理,接收系統(tǒng)的奈奎斯特采樣率為4.01GHz。本文提出的連續(xù)時(shí)間域傅里葉采樣接收系統(tǒng)可以在信號未受到異步干擾的情況下,以1.296GHz的系統(tǒng)采樣率達(dá)到傳統(tǒng)的奈奎斯特速率采樣信號再通過傅里葉變換解調(diào)的相當(dāng)性能。在接收信號受到異步干擾的影響下,傳統(tǒng)的信號接收方法性能急劇下降,而本文提出的連續(xù)時(shí)間域傅里葉采樣系統(tǒng)可以在采樣率為1.296GHz,信噪比為30dB條件下,誤比特率下降到10-4以下。
[Abstract]:Co-coordinated Multi-Point.comp is the core technology of advanced long term evolution long Term Evolution Advanced (LTE-A) to improve cell edge user throughput and overall data transmission rate of network. The combined processing method of comp is based on precoding technology. The decoding process requires the signal of the cooperative base station to arrive at the user terminal at the same time. In the actual network, the user location distribution has some randomness and mobility, so it is difficult for the cooperative base station to ensure that the signal can reach the user terminal at the same time or with less delay difference according to the limited feedback information. This leads to the asynchronous interference problem of multi-user cooperation. At present, researchers mainly design precoding methods for limited feedback channels to eliminate asynchronous interference, but the complexity of these precoding methods is generally high. Based on the advanced compression sensing technology, this paper, by reasonably designing the low rate compression sampling scheme, extracts the interested signal and effectively eliminates the asynchronous interference. This paper first introduces the joint processing technology of CoMP, constructs the heterogeneous network model combining relay and CoMP technology, and analyzes the asynchronous interference problem of the heterogeneous communication network model. The asynchronous interference is caused by the delay difference between the signals of the cooperative base station which arrives at the client. After the Fourier transform demodulation, it will cause the inter-carrier interference of the LTE-A signal. It has been proved that partial Fourier transform can effectively eliminate the influence of inter-carrier interference on the system. In this paper, based on the design ideas of existing literature, the fast Fourier sampling method is extended from discrete time domain to continuous time domain, and a compression sensing asynchronous interference cancellation method based on random partial Fourier transform is proposed. In this method, the random cyclic shift of LTE-A signal spectrum is realized by a multi-channel analog information converter, and then the signal of interest is extracted by filter bank, the important spectrum of signal is decomposed, and the information is collected at sub-Nyquist rate. The frequency and coefficient of important information are estimated by partial Fourier transform. The compression sensing algorithm adopted in this paper is based on partial Fourier transform and only extracts the main frequency information of subcarriers, which can effectively eliminate the influence of asynchronous interference. The simulation results show that the continuous time domain Fourier sampling system can effectively eliminate the influence of asynchronous interference on the system performance while receiving LTE-A signals at sub-Nyquist rate. Under the condition that the signal bandwidth is 10MHz and the carrier frequency is 2GHz, according to Shannon's theorem, the Nyquist sampling rate of the receiving system is 4.01 GHz. The proposed continuous time domain Fourier sampling and receiving system can achieve the equivalent performance of conventional Nyquist rate sampling signal and demodulating by Fourier transform with the system sampling rate of 1.296GHz without asynchronous interference. Under the influence of asynchronous interference on the received signal, the performance of the traditional signal receiving method drops sharply. However, the proposed continuous time domain Fourier sampling system can be used at a sampling rate of 1.296 GHz and a signal-to-noise ratio of 30dB. The bit error rate drops below 10-4.
【學(xué)位授予單位】：福州大學(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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