Systems and methods for adapting a cyclic prefix in the system of orthogonal frequency-division multiplexing (OFDM)

摘要

A system and method for adapting a cyclic prefix (CP) length to a delay spread in a cell in an OFDM cellular communication network. The system determines the longest delay spread in any cell in the network and determines the delay spread for the cell. The CP length for the cell is set to a value equal to or longer than the longest delay spread if the cell's delay spread is equal to the longest delay spread. However, if the cell's delay spread is shorter than the longest delay spread, the CP length for the cell is set to a value equal to or longer than the cell's delay spread and shorter than the longest delay spread. A broadcasting unit broadcasts the value of the cell's CP length over a downlink synchronization channel (DSCH) utilizing a CP length equal to or longer than the longest delay spread to ensure all user terminals can receive the broadcast.