Initial Downlink Synchronization and Cell Search for IEEE 802.16e OFDMA system
碩士 === 國立成功大學 === 電腦與通信工程研究所 === 97 === For broadband wireless access, it is very important that the mobile station (MS) has to perform initial synchronization and cell search when setting up the downlink transmission. The IEEE 802.16e OFDMA system is different from conventional OFDM systems like WL...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2009
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| Online Access: | http://ndltd.ncl.edu.tw/handle/16482769171222242485 |
| Summary: | 碩士 === 國立成功大學 === 電腦與通信工程研究所 === 97 === For broadband wireless access, it is very important that the mobile station (MS) has to perform initial synchronization and cell search when setting up the downlink transmission. The IEEE 802.16e OFDMA system is different from conventional OFDM systems like WLAN. Its time-domain preamble does not have perfect periodicity for time synchronization. And the complexity of the conventional Cell ID identification method is very high due to a large number of long preamble PN codes. In this paper, we utilize the property of its preamble’s frequency-domain structure and that of an OFDM signal to achieve frame detection and Cell ID identification. Meanwhile we also estimate the integer and fractional frequency offset, thus accomplishing the frequency synchronization. This method can reduce the complexity in Cell ID identification and improve the frame detection accuracy.
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