H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 7/216 (2006.01) H04J 13/00 (2006.01) H04Q 7/36 (2006.01) H04B 1/707 (2006.01)
Patent
CA 2276971
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 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 (30) and an address permutation unit (32), are described.
Bouet Etienne
Le Strat Evelyne
Massie Bastien
Tong Wen
Bouet Etienne
Haley R. John
Le Strat Evelyne
Massie Bastien
Tong Wen
LandOfFree
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