公开(公告)号：EP1343265A1

公开(公告)日：2003-09-10

申请号：EP02425130.8

申请日：2002-03-07

Applicant: STMicroelectronics S.r.l.

Inventor： Loiacono, Daniele ,  Messina, Ettore ,  Avellone, Giuseppe ,  Galluzzo, Agostino

IPC: H04J13/02

CPC classification number: H04J13/105 ,  H04J13/0025

Abstract: In order to generate the main scrambling code of order N and the secondary scrambling code of order K within the set identified by the primary scrambling code of order N, a first m-sequence and a second m-sequence are generated using Fibonacci linear feedback shift registers (LFSRs). Then said first m-sequence and said second m-sequence are modulo-2 added so as to form the I branch of said primary scrambling code. A first T-bit masking word and a second T-bit masking word of rank 0 (X0-MASK, Y0-MASK) are generated that correspond to the polynomial time shifts (X0 (D), Y0 (D)), and the intermediate taps of the X and y registers respectively chosen by means of said masking words (X0-MASK, Y0-MASK) are modulo-2 added so as to generate a third sequence and a fourth sequence which are modulo-2 added together to form the Q branch of said primary scrambling code. With the choice, starting from the least significant Kmax bits of the register X, of the K-th intermediate tap corresponding to the secondary scrambling code of order K within said set identified by the primary scrambling code of order N, a fifth sequence is generated, which, modulo-2 added to said second sequence, forms the I branch of said secondary scrambling code. By modulo-2 summing the intermediate taps of the register X masked by means of the aforesaid first masking word of rank N (XN-MASK), a sixth sequence is generated, which, modulo-2 added to the aforesaid fourth sequence, forms the Q branch of the secondary scrambling code.

Abstract translation: 为了产生N阶的主扰码和由次序N的主扰码识别的集合内的次序K的次扰码，使用斐波纳契线性反馈移位生成第一m序列和第二m序列 寄存器（LFSR）。 然后，所述第一m序列和所述第二m序列被加模，以便形成所述主扰码的I分支。 生成对应于多项式时移（X0（D），Y0（D））的第0个（X0-MASK，Y0-MASK）的第一T位屏蔽字和第二T位屏蔽字， 分别通过所述掩蔽字（X0-MASK，Y0-MASK）选择的X和Y寄存器的中间抽头被加模，以便产生模2加在一起形成的第三序列和第四序列 所述主扰码的Q分支。 通过选择，从寄存器X的最低有效Kmax位开始，对应于由次序N的主扰码识别的所述集合内的次序K的次级扰频码的第K个中间抽头，产生第五个序列 ，其中添加到所述第二序列的模2形成所述辅助扰码的I分支。 通过模2对由N（XN-MASK）的上述第一掩蔽字掩蔽的寄存器X的中间抽头进行求和，产生第六序列，其中加上前述第四序列的模2形成 Q分支的二次扰码。