A novel I/Q multiplexed code assignment is proposed for asynchronous cell site operation under hierarchical cell structure, in which the I-channel code as a group code and the Q-channel code as a cell-specific code are assigned to a forward pilot channel. Simulation results show that cell search from macro to micro, or vice versa, can be accomplished in less than ~50 ms at 90% of the locations.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el_19980608
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