| A novel cell search scheme for OFDM cellular systems |
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| 作者姓名： | DING Ming LUO Han-wen WU Yun |
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| 作者单位： | Department of Electronic Engineering，Shanghai Jiao Tong University，Shanghai 200240，China |
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| 基金项目： | Project (No. 60572157) supported by the National Natural ScienceFoundation of China |
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| 摘 要： | INTRODUCTION Owing to its inherent ability to combat the multi-path fading channel, the modulation technology of orthogonal frequency division multiplexing (OFDM) has been widely used in many high-rate data transmissions such as digital video broadcasting (DVB-T), wireless local area network (IEEE 802.11a) and broadband wireless access (IEEE 802.16e). Re-cently, it is accepted as the most promising candidate for E-UTRA downlink (3GPP TSG-RAN-1, 2006a), which is a super 3G cell…
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| 关 键 词： | OFDM蜂窝系统 无线局域网 小区搜索方案 小区ID |
| 收稿时间： | 2006-05-11 |
| 修稿时间： | 2006-08-08 |
A novel cell search scheme for OFDM cellular systems |
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| DING Ming LUO Han-wen WU Yun.A novel cell search scheme for OFDM cellular systems[J].Journal of Zhejiang University Science,2007,8(1):10-17. |
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| Authors: | Ming Ding Han-wen Luo Yun Wu |
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| Institution: | (1) Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China |
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| Abstract: | A novel cell search scheme for OFDM cellular systems is proposed. It is based on one OFDM symbol with several identical slots as preamble, the time domain repetition structure of which can be utilized to accomplish OFDM timing/frequency synchronization. The cell ID is comprised of two parts: a sub-carrier mask index g and a sequence index x. Each sub-carrier mask activates or deactivates some of the sub-carriers, after which a differentially coded sequence is loaded on pairs of the adjacent active sub-carriers. The user equipment (UE) recognizes the mask with index g via power detection of the received frequency domain signal. Then it estimates the index x from differential demodulation followed by detection of the frequency domain se-quence. In order to improve the performance, a method of jointly estimating g and x is devised. Simulation results showed that the proposed scheme is able to support a very large number of cell IDs while maintaining a good performance even in bad multi-cell environment. |
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| Keywords: | Orthogonal frequency division multiplexing (OFDM) Cell search Cell ID Multi-cell Mask |
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