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CLC number: TN929.5

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Received: 2006-05-11

Revision Accepted: 2006-08-08

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Journal of Zhejiang University SCIENCE A 2007 Vol.8 No.1 P.10~17

10.1631/jzus.2007.A0010


A novel cell search scheme for OFDM cellular systems


Author(s):  DING Ming, LUO Han-wen, WU Yun

Affiliation(s):  Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Corresponding email(s):   bobbyfalcon@yahoo.com.cn

Key Words:  Orthogonal frequency division multiplexing (OFDM), Cell search, Cell ID, Multi-cell, Mask


DING Ming, LUO Han-wen, WU Yun. A novel cell search scheme for OFDM cellular systems[J]. Journal of Zhejiang University Science A, 2007, 8(1): 10~17.

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author="DING Ming, LUO Han-wen, WU Yun",
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year="2007",
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doi="10.1631/jzus.2007.A0010"
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%I Zhejiang University Press & Springer
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T1 - A novel cell search scheme for OFDM cellular systems
A1 - DING Ming
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SP - 10
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.2007.A0010


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 sequence. 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.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

[1] 3GPP TSG-RAN-1, 2005. R1-051329 Cell Search and Initial Acquisition for OFDM Downlink. Http://www.3gpp.org/ftp/tsg_ran/WG1_RL1/TSGR1_43/Docs/R1-051329.zip

[2] 3GPP TSG-RAN-1, 2006a. TR 25.814 Physical Layer Aspects for Evolved UTRA (Release 7). Http://www.3gpp.org/ftp/Specs/achive/25_series/25.814/25814-122.zip

[3] 3GPP TSG-RAN-1, 2006b. R1-060379 Cell Search and Initial Acquisition for EUTRA. Http://www.3gpp.org/ftp/tsg_ran/WG1_RL1/TSGR1_44/Docs/R1-060379.zip

[4] Kim, J., Kim, H., Han, Y., 2005. New Preamble Structures for Synchronization and Cell Searching in OFDM Systems. IEEE VTC’05 Fall. Dallas, TX, p.1623-1627.

[5] Kwon, D.S., Lim, H., Park, H., 2004. Preamble structure for single frequency cellular systems using orthogonal frequency division multiplexing. IEEE Transactions on Consumer Electronics, 50(1):115-118.

[6] Lee, J., Lee, Y., 2005. Rapid Cell Search in OFDM-based Cellular Systems. IEEE VTC’05 Spring. Stockholm, Sweden, p.1273-1277.

[7] Selesnick, I.W., Burrus, C.S., 1996. Automatic generation of prime length FFT programs. IEEE Transactions on Signal Processing, 44(1):14-24.

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