公开(公告)号：US06839876B1

公开(公告)日：2005-01-04

申请号：US09611968

申请日：2000-07-06

申请人： Wen Tong ,  Bastien Massie ,  Etienne Bouet ,  Evelyne Le Strat

发明人： Wen Tong ,  Bastien Massie ,  Etienne Bouet ,  Evelyne Le Strat

IPC分类号： H04B1/707 ,  H04J13/00 ,  H04J13/10 ,  H03M13/00

CPC分类号： H04J13/107 ,  H04B2201/70701 ,  H04J13/0014

摘要： 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.

摘要翻译： CDMA（码分多址）通信系统的反向接入信道（RACH）的前同步码包括一对组合的Golay序列A和B，其连接有至少一对，优选多个不同的转换序列对，其中， 也是组成Golay序列，每对变换序列包括一对序列A和B的元素的置换。排列可以包括序列中元素的相反顺序，一组或全部地址的相反顺序 识别序列中元素的位的比特，序列A和B的奇数和偶数位置中的元素子集的级联，以及这些排列的组合。 描述用于提供前导码的方法以及使用双向计数器和地址置换单元的相关装置。