Three-Step Cell Search Algorithm Employing Synchronization and Common Pilot Channels for OFCDM Broadband Wireless Access(Special Issue on Software Defined Radio Technology and Its Applications)
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概要
- 論文の詳細を見る
This paper proposes a three-step cell search algorithm utilizing a synchronization channel (SCH) and common pilot channel (OPICH) in the forward link for OFCDM (Orthogonal Frequency and Code Division Multiplexing) broadband packet wireless access, and evaluates the cell search time performance by computer simulation. In the proposed three-step cell search algorithm, the OFCDM symbol timing, i.e., Fast Fourier Transform (FFT) window timing is estimated employing SCH or guard interval (CI) correlation in the first step. Then, the frame timing is detected by employing the SCH and the cell-specific scrambling code (CSSC) is identified by the CPICH in the second and third steps, respectively. Computer simulation results elucidate that the proposed three-step cell search algorithm achieves fast cell search time performance, i.e., cell detection probability of 90% within approximately 50 msec, assuming the number of CSSCs of 512 in a 19 hexagonal-cell model. We also clarify that there is no prominent difference in cell search time performance between the two employed SCH structures, time-multiplexed and frequency-multiplexed, assuming that the total transmit power of the SCH is the same. Based on the comparison of four substantial cell search algorithms, the CI-plus-SCH correlation method, in which FFT windowing timing detection, frame timing detection, and CSSC identification are performed by GI correlation, frequency-multiplexed SCH, and CPICH, respectively, exhibits the cell search time of approximately 44 msec at the detection probability of 90% with an optimized averaging parameter in each step.
- 社団法人電子情報通信学会の論文
- 2002-12-01
著者
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HIGUCHI Kenichi
Wireless Laboratories, NTT DoCoMo, Inc.
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SAWAHASHI Mamoru
Wireless Laboratories, NTT DoCoMo, Inc.
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Sawahashi Mamoru
Wireless Laboratories Ntt Do Como Inc.
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Higuchi Kenichi
Wireless Laboratories Ntt Docomo Inc.
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Ishii Yukiko
Wireless Laboratories Ntt Docomo Inc.
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