Initial Synchronization in Carrier Aggregation Scenarios Applied on LTE-A Communications

• Main Authors: Chin-Yi Chang, 張靜宜
• Other Authors: Jia-chin Lin
• Format: Others
• Language: en_US
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/82248893748227147248

碩士 === 國立中央大學 === 通訊工程研究所 === 99 === Since the demand of high speed mobile broadband services, the International Telecommunication Union - Radio Communication Sector (ITU-R) has proposed the next generation mobile communication system Long term evolution advanced (LTE-Advanced) which will retain most of the system construction in Long term evolution (LTE) and increase the performance of it. Then, LTE-Advanced proposes carrier aggregation (CA) to aggregate component carriers (CCs) which I belonging to contiguous or non-contiguous frequency bands and it is used to meet the specification of future International Mobile Telecommunication – Advanced (IMT-Advanced) mobile systems: peak data rates up to 1Gbps in downlink and 500Mbps in uplink. In original cellular system in LTE, user equipment (UE) only needs to establish a connection with a best serving evolved-Node B (e-NB). So, UE needs to establish a connection and synchronize with the e-NB. The steps of synchronization are as follows: (1). Using the delay auto-correlation to find frame timing and the P-SCH (primary synchronization signal), and then use the sequence to estimate the symbol timing and the fractional frequency offset. (2). Using the match filter with the P-SCH to estimate the integer frequency offset [1-3]. In the thesis, we propose a new structure for CA to establish the connections between UE and base stations at the same time and the UE can get the frequency offsets and synchronize with the base stations as soon as possible.