| 摘要 |
A method for use in a cellular, FFT based multi-carrier communications syste m comprising N sub-carriers, for allocating a set P of sub-carriers to be reserved for potential use as carriers of specific information, comprises th e following steps:- selecting a number M indicating the number of sub-carriers to be allocated to a set P of sub-carriers, such that L=N/M is an integer- allocating the at least two subcarriers of the set P={(n0+m*L) mod N : 0< =m<M} for the specific information, n0 being the offset of the lowest numbered subcarrier in P, the elements of P being indices, each referring to the numb er of a sub-carrier to be allocated. An apparatus for carrying out the method i s also disclosed. According to the invention, the sub-channels are maximally spread in frequency, which gives maximum diversity and also enables the use of low-complexity terminals.
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