A DIRECT-SEQUENCE SPREAD SPECTRUM COMMUNICATION SYSTEM, A PRIMARY RADIO STATION, AND A SECONDARY RADIO STATION

摘要

Known are direct-sequence spread spectrum systems (1) such as CDMA mobile radio systems applying short pseudo-noise sequencesfor encoding and decoding of data. A DS-SS communication system is provided in which less pseudo-noise sequences are used while atthe same time providing efficient locking at the receiver side. To this end, a majority of the channels (BCH, PCH, AGCH, TCH, ACCH)in a cell (Z1, Z2) of a mobile radio system (1) share one long pseudo-noise sequence (PNL). At reception side, in a mobile radio station(MS 1, MS2) or the like, efficient calculation of current sequence phases for current received channels is achieved by applying vector-matrixcalculations to a received sequence state [err] and received sequence offset (ofset) that are transmitted by a base station (BS1, BS2). Thevector-matrix calculations apply precalculated and stored sequence offset transformation matrices (A).