| 摘要 |
A method for use in a cellular, FFT based multi-carrier communications system comprising N subcarriers, for allocating a set P of sub-carriers to be reserved for potential use as carriers of specific information. 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. 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 number of a sub-carrier to be allocated. An apparatus for carrying out the method is also disclosed. 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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