Patent ID: 7869532

Claim:
A cellular communication system employing a plurality of bandwidths, the cellular communication system comprising: a plurality of base stations, each base station being arranged to transmit a reference signal comprising a Generalised Chirp-Like, GCL, sequence, a length of the GCL sequence being dependent on a bandwidth employed by the base station; sequence means for providing a first subset of GCL sequences for a first bandwidth, the first subset comprising GCL sequences selected from a set of possible GCL sequences for the first bandwidth in response to properties of a sub-sequence of the GCL sequences of the set of possible GCL sequences, the sub-sequence having a length corresponding to a different bandwidth than the first bandwidth; selection means for selecting a first GCL sequence for a first base station of the plurality of base stations employing the first bandwidth from the first subset of GCL sequences; and means for selecting sequences for a second bandwidth in response to a truncation of GCL sequences of the first subset, the second bandwidth being lower than the first bandwidth; wherein the truncating means is arranged to maintain a central portion of the GCL sequences of the first subset.