Next Generation Mobile Communication System In Space-time Block Codes Research

With the development of mobile communication, the demands for the limited frequency resource are booming. To develop highly efficient coding, modulation and signal processing technologies is becoming the most necessary measure to meet these demands. Space-time coding (STC), a new coding/signal processing technique, is the combination of channel coding with antenna diversity techniques, and enormously increases the wireless communication system capacity and the data rate without additional system bandwidth and transmitting power.The dissertation focuses on the space-time block coding (STBC), a kind of STC with simple decoding scheme, which may be used in the next generation mobile communication systems. The main contents are arranged as follows.The first chapter overviews the development of the mobile communication systems and prospects the next generation communication system, especially its key technology. The mobile wireless channels are analyzed, and the diversity technology, the primary method that used to overcome multipath fading in the mobile communication, is introduced in the second chapter. The third chapter provides the theory about the STC based on multiple-input and multiple-output (MIMO) channel capacity formula, and derives the criteria of STC, and then compares the performance of the three primary kinds of STC. The next chapter expands Alamouti coding to multiple antennas based on the full-diversity and orthogonal design. STBC is derived. In the fifth chapter, quasi-orthogonal STBC (QSTBC) is derived based on full-rate, and a novel decoding scheme is presented. The conclusions and the next step research targets are provided in the last chapter.