标题: | 适应性MIMO-OFDM系统于FPGA与DSP之实现 FPGA and DSP Realization of an Adaptive MIMO-OFDM System |
作者: | 古仲达 Chung-Ta Ku 李大嵩 Ta-Sung Lee 电信工程研究所 |
关键字: | 多重输入多重输出;正交分频多工;适应性;硬体实现;时空区块编码;群组式时空区块编码;MIMO;OFDM;Adaptive;Hardware Realization;STBC;V-BLAST;G-STBC;FPGA;DSP |
公开日期: | 2004 |
摘要: | 正交分频多工(OFDM)技术因可提供高速数据传输,且适合操作在多重路径所引起之频率选择性通道下,故能在未来无线通讯系统中成为一种备受瞩目之技术;另一方面,多输入多输出(MIMO)技术具有极大潜力可提升传输率及链路品质。当OFDM技术与MIMO技术结合后,将变得更适于下一代无线通讯系统,而这也激发吾人进行硬体实现工作之意愿,而非仅止于理论分析。在本论文中,吾人将提出一个针对建置MIMO-OFDM系统于MP3CF硬体平台之完整解决方案。此硬体平台装设有FPGA与DSP模组,透过适当分配不同功能区块于FPGA与DSP模组,吾人得以在此平台上实现一个4x4 MIMO-OFDM系统。在此系统中,吾人采用了三种不同之时空演算法,分别为STBC、V-BLAST,及G-STBC。由于任何一种时空演算法均无法在多变通道下稳定地保持良好品质,因此吾人针对此系统提出一种模式选择机制以决定最适于目前通道特性之时空演算法。实验结果显示,具有适应性能力之4x4 MIMO-OFDM系统比不具适应性能力之相同系统具有较高的传输率。 For future wireless communication systems, orthogonal frequency division multiplexing (OFDM) is a promising technique, enabling high data rate transmission, and is suitable for frequency selective channels caused by multipath propagation. On the other hand, multiple-input multiple-output (MIMO) technique has a great potential of delivering either a dramatic increase of throughput or improvement of link quality. Combined with the MIMO technique, OFDM systems become more suited to next generation wireless communications, and this inspires us to perform the task of hardware realization instead of pure theoretical analysis. In this thesis, we propose a total solution for building up a MIMO-OFDM system on a hardware platform, Aptix MP3CF, where FPGA and DSP modules are installed. By mapping different functional blocks onto the FPGA and DSP respectively, we can realize a MIMO-OFDM system on the platform. There are three space-time algorithms adopted in our system, including Space-Time Block Coding (STBC), Vertical Bell Labs Layered Space-Time (V-BLAST), and Group Wise STBC (G-STBC). In view of the fact that no single space-time algorithm can always perform well under various channel conditions, we propose a mode selection scheme for the system to determine the most suitable space-time algorithm under the present channel. The experimental results show that the adaptive MIMO-OFDM system can perform better than the same system without incorporating the adaptive mechanism. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#GT009213587 http://hdl.handle.net/11536/70290 |
显示于类别: | Thesis |
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