직교주파수 분할 다중 접속 방식을 사용하는 셀룰러 시스템에서 셀 탐색을 위한 장치 및 그 방법
- 8103273 (2012.01.24)
- A cell search device using an appropriate preamble for a downlink of a cellular system using an orthogonal frequency division multiplexing access (OFDMA) scheme and a method thereof is disclosed. The cell search device for a terminal of a cellular system using an orthogonal frequency division multiplexing access scheme includes when the terminal receives a preamble symbol from a base station, a PN code and phase delay estimating unit for generating a code with the received preamble symbol and a combination of a PN code and a Walsh code, calculating a correlation value therebetween using a differential demodulation for the codes to detect the PN code, a plurality of Walsh codes, and an error of a time delay, and estimating a component of a phase delay for the time delay; and a Walsh code estimating unit for minimizing the influence of the time error using the phase delay and the PN code information obtained by the differential demodulation of the PN code and phase delay estimating unit and estimating a Walsh code for the corresponding cell by synchronization demodulation.
- KSP 제안 키워드
- Access scheme, Cell search, Cellular system, Differential demodulation, Frequency division, Frequency division multiplexing, OFDMA scheme, Orthogonal Frequency Division Multiple Access(OFDMA), Orthogonal frequency division Multiplexing(OFDM), PN code, Time Delay, Time Error, Walsh code, base station(BS), division multiplexing, phase delay