本文選題：極化調(diào)制 + 去極化效應　； 參考：《北京郵電大學》2015年碩士論文

【摘要】：極化調(diào)制(Polarization Modulation, PM)可以突破傳統(tǒng)無線通信調(diào)制技術(shù)對射頻功放線性要求的限制,確保功放可以工作在具有高轉(zhuǎn)換效率的非線性區(qū),而且不對承載信息的信號屬性造成失真,從而保證較高的有效數(shù)據(jù)速率。然而將極化狀態(tài)承載信息引入到無線通信中,面臨的一個最大挑戰(zhàn)是無線信道特有的去極化效應。無線通信環(huán)境的多徑和富散射特性會產(chǎn)生嚴重的去極化效應,如極化相關(guān)損耗(Polarization Dependent Loss, PDL)、極化模式色散(Polarization Mode Dispersion,PMD)會嚴重改變發(fā)射信號的極化狀態(tài),降低極化調(diào)制的傳輸性能：1)對單載波極化調(diào)制造成的損害主要是由PDL效應帶來的,表現(xiàn)為信號在信道傳播中所遭受到的功率衰減與該信號的發(fā)射極化狀態(tài)相關(guān)；2)在多載波通信場景下,由于無線信道的PMD效應,每個載波上的去極化效應呈現(xiàn)出與頻率相關(guān)的特性,如不同的載波具有不同程度的PDL效應,導致不同載波上的誤比特率性能具有差異性。因此,若要在無線通信中利用極化調(diào)制,研究抗無線信道去極化效應(如PDL、PMD)的機制或算法很有必要。 本論文選題來源于國家自然科學基金項目《基于認知與極化信號處理的功放節(jié)能研究,項目批準號：61271177》。論文具體研究了降低極化相關(guān)損耗和極化模式色散對極化調(diào)制造成影響的自適應極化調(diào)制技術(shù),對相關(guān)算法或機制進行了較深入的分析和研究。 本文的主要研究工作及成果包括： (1)對現(xiàn)有極化信息處理技術(shù)、極化調(diào)制技術(shù)研究、去極化效應分析研究及自適應調(diào)制(Adaptive Modulation,AM)技術(shù)等關(guān)鍵技術(shù)與相關(guān)理論進行了分析與綜述,指出了利用自適應技術(shù)來降低無線信道中PDL效應與PMD效應對極化調(diào)制影響的可行性,為展開本論文研究工作奠定了理論與技術(shù)基礎(chǔ)。 (2)針對單載波通信場景下信道中的PDL效應會導致信號功率衰減,影響極化調(diào)制系統(tǒng)誤比特率的問題,本文提出了自適應極化調(diào)制機制：發(fā)送端根據(jù)接收端發(fā)回的反饋信息自適應的選定最優(yōu)階極化調(diào)制來傳輸數(shù)據(jù)。仿真結(jié)果及其分析表明,在滿足相同誤比特性能前提下,與固定極化調(diào)制相比,自適應極化調(diào)制在頻譜效率方面獲得了提升,使極化調(diào)制系統(tǒng)得到了優(yōu)化。 (3)針對多載波通信場景下基于極化調(diào)制的正交頻分復用(Orthogonal Frequency Division Multiplexing, OFDM)系統(tǒng)受到無線信道PMD效應的影響而使得性能下降的問題,本文提出了基于子載波分塊的自適應極化調(diào)制機制：發(fā)送端根據(jù)接收端發(fā)回的有關(guān)當前信道質(zhì)量情況的反饋信息來計算出每一個子載波塊的平均信噪比并與信噪比門限值對比,進一步選定每一個子載波塊采用最優(yōu)階極化調(diào)制來傳輸數(shù)據(jù)。仿真結(jié)果表明,該機制能有效削弱PMD效應對基于極化調(diào)制的OFDM系統(tǒng)中總體誤碼性能的影響。
[Abstract]:Polarization Modulation (PMN) can break through the limitation of traditional wireless communication modulation technology on the linear requirements of RF power amplifier, and ensure that the amplifier can work in a nonlinear region with high conversion efficiency and does not cause distortion to the signal properties of the information. In order to ensure a higher effective data rate. However, one of the biggest challenges to the introduction of polarization state information into wireless communication is the unique depolarization effect of wireless channels. The multipath and rich scattering characteristics of wireless communication environment will produce serious depolarization effects, such as polarization dependent loss polarization (PDL), polarization mode dispersion polarization Mode dispersion (PMDs) will seriously change the polarization state of the transmitted signal. The damage caused by reducing the transmission performance of polarization modulation: 1) to single carrier polarization modulation is mainly caused by the PDL effect. It is shown that the power attenuation of the signal in the channel propagation is related to the transmitting polarization state of the signal) in the multi-carrier communication scenario, due to the PMD effect of the wireless channel, The depolarization effect on each carrier shows the characteristics related to frequency, for example, different carriers have different PDL effect, which leads to the difference of bit error rate performance on different carriers. Therefore, in order to utilize polarization modulation in wireless communication, it is necessary to study the mechanism or algorithm to resist the depolarization effect of wireless channel (such as PDLPMDs). This thesis comes from the project of National Natural Science Foundation of China < Research on Energy Saving of Power Amplifier based on Cognitive and polarized signal processing, Project approval No.: 61271177 >. In this paper, the adaptive polarization modulation technology which can reduce polarization dependent loss and polarization mode dispersion on polarization modulation is studied, and the related algorithms or mechanisms are analyzed and studied deeply. The main research work and achievements of this paper are as follows: In this paper, the current polarization information processing technology, polarization modulation technology, depolarization effect analysis and adaptive modulation (AM) technology are analyzed and summarized. The feasibility of using adaptive techniques to reduce the effects of PDL and PMD on polarization modulation in wireless channels is pointed out, which lays a theoretical and technical foundation for the research work in this paper. Aiming at the problem that the PDL effect in the single carrier communication scenario will lead to the signal power attenuation and affect the bit error rate of the polarization modulation system, In this paper, an adaptive polarization modulation mechanism is proposed: the sender adaptively selects the optimal order polarization modulation to transmit data according to the feedback information from the receiver. The simulation results and its analysis show that the adaptive polarization modulation improves the spectral efficiency and optimizes the polarization modulation system compared with the fixed polarization modulation under the same bit error performance. In view of the problem of orthogonal Frequency Division Multiplexing (OFDM) based on polarization modulation in multicarrier communication scenarios, the performance of orthogonal Frequency Division Multiplexing (OFDM) systems is degraded due to the influence of the PMD effect over wireless channels. In this paper, an adaptive polarization modulation mechanism based on sub-carrier block is proposed. The transmitter calculates the average SNR of each sub-carrier block based on the feedback information from the receiver about the current channel quality and compares it with the signal-to-noise ratio threshold. Each sub-carrier block is further selected to transmit data using optimal order polarization modulation. Simulation results show that this mechanism can effectively weaken the effect of PMD effect on the overall error performance of OFDM systems based on polarization modulation.
【學位授予單位】：北京郵電大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN761

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