Title :
Cell search scheme embedded with carrier frequency synchronization in broadband OFDM-CDM systems
Author_Institution :
Fujitsu Labs. Ltd., Kawasaki, Japan
Abstract :
The paper presents a cell search scheme embedded with carrier frequency synchronization for intercell asynchronous orthogonal frequency-division multiplexing code-division multiplexing (OFDM-CDM) systems. Several subcarriers are dedicated to a differentially encoded synchronization channel (SCH). In the other subcarriers, data symbols and pilot symbols are two-dimensionally spread in the time-frequency domain. The cell search scheme consists of a three-stage cell search and a two-stage carrier-frequency synchronization, that is, coarse carrier-frequency acquisition, fast Fourier transform window-timing detection, SCH frame-timing detection, fine carrier-frequency synchronization, and cell-specific scrambling code (CSSC) identification. Simulation demonstrated that this scheme can identify the CSSC with high detection probability while precisely synchronizing the carrier frequency in severe frequency-selective fading channels.
Keywords :
OFDM modulation; broadband networks; cellular radio; code division multiplexing; fading channels; fast Fourier transforms; probability; radio access networks; signal detection; synchronisation; FFT window-timing detection; broadband OFDM-CDM systems; carrier frequency synchronization; cell search scheme; cell-specific scrambling code identification; code-division multiplexing systems; data symbols; differentially encoded synchronization channel; fast Fourier transform; frame-timing detection; frequency-selective channels; frequency-selective fading channels; intercell asynchronous OFDM-CDM systems; mobile terminal; orthogonal frequency-division multiplexing systems; pilot symbols; time-frequency domain; wireless access systems; Base stations; Channel estimation; Fast Fourier transforms; Frequency division multiplexing; Frequency synchronization; OFDM; Phase detection; Phase frequency detector; Time frequency analysis; Timing;
Conference_Titel :
Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE
Print_ISBN :
0-7803-7632-3
DOI :
10.1109/GLOCOM.2002.1188076
