H - Electricity – 03 – M
Patent
H - Electricity
03
M
H03M 13/13 (2006.01) H04J 13/00 (2006.01)
Patent
CA 2313411
A preamble for a reverse access channel (RACH) of a CDMA (code division multiple access) communications system comprises a pair of constituent Golay sequences A and B concatenated with at least one pair, and preferably a plurality of different pairs, of transformed sequences which are also constituent Golay sequences, each pair of transformed sequences comprising a permutation of elements of the pair of sequences A and B. The permutations can include a reversed order of elements in the sequences, a reversed order of some or all of a set of address bits identifying locations of elements in the sequences, a concatenation of subsets of elements in odd and even locations of the sequences A and B, and combinations of these permutations. A method for providing the preamble, and related apparatus using a bidirectional counter and an address permutation unit, are described.
Bouet Etienne
Le Strat Evelyne
Massie Bastien
Tong Wen
Nortel Networks Limited
Smart & Biggar
LandOfFree
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