Initial Synchronization and Cell Search Schemes for IEEE 802.16e system with Multi-cell Interference

• Main Authors: Shun-Hsiung Chang, 張順雄
• Other Authors: 黃正光
• Format: Others
• Language: en_US
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/75027492573172298293

碩士 === 元智大學 === 通訊工程學系 === 97 === In this thesis, we first construct the downlink (DL) preamble structure and signal model with carrier frequency offset (CFO) for IEEE 802.16e orthogonal frequency division multiplexing access (OFDMA) systems. In order to achieve the truly initial synchronization, several methods for packet/symbol timing, frequency synchronization, and cell ID search are introduced, improve, and analyzed by using DL preamble properties and the derived received signal model. In addition, when the mobile device receives the preamble signals from multiple basestations, these signals will cause synchronization errors and interfere with each other which is called multi-cell interference. For this special case, we also propose some effective multi-cell cancellation schemes in frequency domain and in space-frequency domain to mitigate the multi-cell interference and to avoid the synchronization errors before using the proposed initial synchronization algorithms. Finally, from analytic and computer simulation results, we show that the proposed overall initial synchronization algorithm achieves high efficiency and performance, making it suitable for practical applications.