| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程系 === 100 === In this thesis, we worked on the architecture of 4G wireless communication system. We use the hadamard transform and phase rotated in the precoder to arise the diversity gain of the receiver. Due to the increasing popularity and demand of wireless online and wireless communication, it becomes the main concern to find ways to efficiently distribute the limited spectrum, and further maximize the utility of spectrum. For this purpose, we use multi-input multi-output(MIMO) technology, which can add many independent channels for data to transmit parallelly and simultaneously. It can help us to reach our goal of improving the efficiency. Then we combine MIMO technology with Orthogonal Frequency-Division Multiplexing (OFDM) modulation technology to be MIMO-OFDM, which is the focus of 4G mobile communication. Furthermore, we use EXIT charts to analyze the behavior of detection and decoder. Base on these architecture, we add orthonormal precode, Hadamard matrix, to spread. It makes signals have both MIMO and spreading. The bigger the spreading size is, the higher the diversity gain will be. That is the reason why spreading transmission becomes so popular in these years. Therefore, this research is focused on how to reduce the complexity of detection and having better performance.
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