本文選題：無線通信 + 高移動�。� 參考：《浙江大學》2017年碩士論文

【摘要】：隨著無線通信、網(wǎng)絡(luò)技術(shù)的發(fā)展以及社會需求的不斷提高,在高移動場景中提供可靠、高質(zhì)量的無線通信服務(wù)已經(jīng)成為通信領(lǐng)域的研究熱點。高移動無線寬帶通信中的無線信道在時間以及頻率維度對信號產(chǎn)生影響,因此高移動信道具有雙選擇性。高移動無線通信場景已經(jīng)深入我們生活中的方方面面,亟需研究實際可行的方案與系統(tǒng),在實際場景中減輕高移動信道的影響,提高通信傳輸效率,并基于實踐,為理論研究提供新的方向。本文主要圍繞高移動無線通信場景下無速率編碼以及矢量多載波調(diào)制技術(shù)的應(yīng)用,內(nèi)容分為:本文提出了一種基于矢量多載波調(diào)制的低復雜度高移動雙選擇衰落信道估計方法。首先分析了矢量多載波調(diào)制在CE-BEM建模的雙選擇信道中的符號擴展的具體數(shù)學形式。基于符號擴展結(jié)構(gòu),設(shè)計了在發(fā)送端的矢量多載波調(diào)制數(shù)據(jù)符號塊中插入導頻的方式以及在接收端基于該導頻估計雙選擇信道CE-BEM參數(shù)的方法。該方法相比傳統(tǒng)基于OFDM的信道估計方法,在移動性越高的情況下,越能夠降低導頻開銷,具有更低的計算復雜度。也提出了 一種矢量多載波調(diào)制系統(tǒng)中對傳統(tǒng)CE-BEM建模的改進方案,通過引入混淆,犧牲了信道估計的準確度,使得信道估計值在信道均衡階段有更好的性能。本文提出了高移動場景下無速率碼矢量多載波通信系統(tǒng)設(shè)計方案。通過分析無速率碼以及矢量多載波調(diào)制方案的特點,提出了將它們組成聯(lián)合編碼調(diào)制系統(tǒng)。設(shè)計了數(shù)據(jù)拆分成幀方案、傳輸機制、物理層幀的生成及接受處理流程以及多級流水線譯碼機制。為了驗證系統(tǒng)設(shè)計的可行性,我們使用軟件無線電平臺SORA編程實現(xiàn)了上述系統(tǒng),產(chǎn)出了系統(tǒng)原型。在實際驗證中,系統(tǒng)能夠快速跟蹤信道的變化,并通過無速率碼的桶積水特性適應(yīng)不同移動性下的信道容量,在高效率譯碼機制的幫助下,在移動性不斷變化的時能自適應(yīng)地獲得近似最優(yōu)的整體吞吐率。本文最后基于無速率碼,設(shè)計了自適應(yīng)多分辨率數(shù)據(jù)廣播系統(tǒng)�；诓坏炔铄e保護的概念,我們設(shè)計了實際的多分辨率無速率碼,使得發(fā)送端基本不需要了解接收端信息或者接受反饋,獨立地發(fā)送一個數(shù)據(jù)流。在接收端,這樣的無速率碼保證了越重要的數(shù)據(jù)的信息量累計的越多,參與的譯碼迭代次數(shù)也越多。此后,又根據(jù)廣播系統(tǒng)中的保證最低質(zhì)量場景以及盡力傳輸場景,設(shè)計了相關(guān)廣播系統(tǒng)的實現(xiàn)方案。通過統(tǒng)一考慮接收端的計算、通信能力,實現(xiàn)了廣播場景中接收端數(shù)據(jù)量的自適應(yīng),使得所有接收端能夠從一個單一的發(fā)送源中獲取其計算、通信能力限制下的近似最高數(shù)據(jù)質(zhì)量,并降低了發(fā)送端的開銷。
[Abstract]:With the development of wireless communication, the development of network technology and the continuous improvement of social demand, providing reliable and high-quality wireless communication services in high mobile scenes has become a research hotspot in the field of communication. In high mobile wireless broadband communication, the time and frequency dimensions of the wireless channel affect the signal, so the high mobile channel has dual selectivity. The scene of high mobile wireless communication has penetrated into every aspect of our life. It is urgent to study practical schemes and systems in order to reduce the influence of high mobile channel, improve the transmission efficiency and base on practice. It provides a new direction for theoretical research. This paper focuses on the application of rate free coding and vector multicarrier modulation in high mobile wireless communication scenarios. The main contents are as follows: this paper presents a low complexity mobile dual selective fading channel estimation method based on vector multicarrier modulation. Firstly, the mathematical form of symbol expansion of vector multicarrier modulation in CE-BEM dual selection channel is analyzed. Based on the symbol expansion structure, a pilot method is designed to insert pilot into the vector multicarrier modulation data symbol block at the transmitter and a method to estimate the CE-BEM parameters of the dual-selection channel based on the pilot at the receiving end. Compared with the traditional channel estimation method based on OFDM, the proposed method can reduce the pilot overhead and have lower computational complexity with higher mobility. An improved scheme for traditional CE-BEM modeling in vector multicarrier modulation systems is also proposed. By introducing confusion, the accuracy of channel estimation is sacrificed and the channel estimation value has better performance in the channel equalization stage. In this paper, a design scheme of rate-free vector multi-carrier communication system in high mobile scene is proposed. By analyzing the characteristics of rate free code and vector multicarrier modulation scheme, a joint coded modulation system is proposed. The scheme of data splitting into frames, the transmission mechanism, the generation and acceptance process of physical layer frames and the multilevel pipeline decoding mechanism are designed. In order to verify the feasibility of the system design, we use the software radio platform SORA programming to achieve the above system, and produce the system prototype. In the actual verification, the system can track the channel changes quickly, and adapt to the channel capacity under different mobility through the bucket water characteristic without rate code, with the help of high efficiency decoding mechanism. The approximate optimal global throughput can be obtained adaptively when mobility is changing. Finally, an adaptive multi-resolution data broadcasting system based on rate-free code is designed. Based on the concept of unequal error protection, we design an actual multi-resolution rate-free code, which makes the sender send a data stream independently without knowing the information or receiving feedback from the receiver. At the receiving end, the rate free code guarantees that the more important data information accumulates, the more the number of decoding iterations is involved. Then, according to the guaranteed minimum quality scenario and the best transmission scenario in the broadcast system, the implementation scheme of the related broadcast system is designed. By considering the calculation of the receiver and the communication ability, the adaptive data of the receiver in the broadcast scene is realized, which enables all the receivers to obtain their calculations from a single source. The maximum data quality is approximately limited by the communication capability, and the cost of the sender is reduced.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN92

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本文編號：2017476