發(fā)布時間：2018-03-11 19:40

  本文選題：MIMO　切入點：OFDM　出處：《青島理工大學》2014年碩士論文　論文類型：學位論文

【摘要】：隨著科技水平的不斷提高，無線通信作為現(xiàn)代通信領域中重要的通信方式取得了迅猛的發(fā)展。然而伴隨著社會的進步，人們對無線通信的需求也在不斷地提高。為了滿足社會的需求，無線通信技術以更快的速度在發(fā)展著，各種新技術也不斷地被提出。不同的技術適用于不同的通信環(huán)境，當通信環(huán)境改變時，就需要重新設計一套新的通信系統(tǒng)，且采用不同通信技術的通信系統(tǒng)之間的通信也變得非常復雜。傳統(tǒng)的解決方案是為各個通信系統(tǒng)設計專用的多模多頻芯片，但專用芯片往往不能適用于其他通信環(huán)境，開發(fā)進度慢、成本高、通用性差。因此對無線通信技術及無線通信系統(tǒng)的研究有著重要的意義。 本文研究了無線通信系統(tǒng)中的幾個主流的通信技術包括OFDM技術、MIMO技術和智能天線技術，根據三種技術的特點，提出了一種融合了三種技術的解決方案，該融合技術方案抑制了每種技術單獨使用存在的缺點。融合技術方案中提出了一種空間平滑的快速子空間算法用以估計波達角，此算法保證了對相干信號的有效識別，同時進行了二次降維，大大降低了算法的復雜度，提高了識別的速度。利用FPGA的可重置性，運用模塊化思想，設計出了一種基于FPGA的無線通信系統(tǒng)。該系統(tǒng)采用以OFDM技術為核心的技術方案，由可數字重配或可替換模塊組成，因此可以進行靈活的配置，，從而能夠適應各種不同的通信環(huán)境和不同的通信系統(tǒng)。本文以工作在2.4GHz頻段的通信系統(tǒng)為例，設計實現(xiàn)了系統(tǒng)的各個模塊，包括天線發(fā)射接收部分、上下變頻部分、數模/模數轉換部分、FPGA發(fā)射與接收的編碼與調制等部分。實驗測試結果表明各個模塊能夠實現(xiàn)相應的功能達到了設計的要求。 模塊化的設計思想使本文所設計的無線通信系統(tǒng)具有靈活、方便、適應性強的特點，但系統(tǒng)模塊較多，易用性和穩(wěn)定性有待提高。因此，該系統(tǒng)適用于某個通信環(huán)境下的方案驗證和臨時通信。
[Abstract]:With the continuous improvement of science and technology, wireless communication as an important communication mode in the field of modern communications has made rapid development. However, with the progress of society, The demand for wireless communication is also increasing. In order to meet the needs of society, wireless communication technology is developing at a faster speed, and various new technologies are constantly being put forward. Different technologies are suitable for different communication environments. When the communication environment changes, a new communication system needs to be redesigned. The traditional solution is to design a special multi-mode multi-frequency chip for each communication system, but the special chip can not be used in other communication environment. The development progress is slow, the cost is high, and the generality is poor, so the research on wireless communication technology and wireless communication system is of great significance. This paper studies several mainstream communication technologies in wireless communication system, including OFDM technology and smart antenna technology. According to the characteristics of the three technologies, a solution that combines three technologies is proposed. The proposed fusion scheme overcomes the shortcomings of each technique used separately. In the fusion scheme, a fast subspace algorithm of spatial smoothing is proposed to estimate the DOA, which ensures the efficient recognition of coherent signals. At the same time, the second dimension reduction is carried out, which greatly reduces the complexity of the algorithm and improves the speed of recognition. A wireless communication system based on FPGA is designed. The system is composed of digital reconfigurable or replaceable modules, which is based on OFDM technology, so it can be configured flexibly. Thus it can adapt to different communication environments and different communication systems. Taking the communication system working at 2.4 GHz as an example, this paper designs and implements various modules of the system, including antenna transmitting and receiving part, up-down conversion part, and so on. The digital to analog / analog-to-digital conversion part includes the coding and modulation of FPGA transmission and reception. The experimental results show that each module can achieve the corresponding functions to meet the requirements of the design. The design idea of modularization makes the wireless communication system designed in this paper have the characteristics of flexibility, convenience and strong adaptability, but the system has many modules and needs to be improved in ease of use and stability. The system is suitable for scheme verification and temporary communication in a communication environment.
【學位授予單位】：青島理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN92

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