초록 ▼

A method and apparatus for constructing a series of PN code sets that can be used for multirate synchronous and quasi-synchronous CDMA systems. The construction technique produces PN codes that are balanced, and that furthermore do not require any synchronization of neighboring base stations. The me

A method and apparatus for constructing a series of PN code sets that can be used for multirate synchronous and quasi-synchronous CDMA systems. The construction technique produces PN codes that are balanced, and that furthermore do not require any synchronization of neighboring base stations. The method is a non-recursive method that uses a permuted orthogonal matrix to modulate permuted orthogonal matrices to create PN codes that support multirate operation. Furthermore, the codes constructed using the method have very good spectral properties (if chosen properly) when the code length, n, is reasonably large.

대표청구항 ▼

[ What is claimed is:] [1.] A non-recursive method for constructing balanced PN code sets for use in a code division, multiple access (CDMA) communication system, comprising steps of:applying a constrained permutation to a G x G .+-.1 valued matrix to form a modulation matrix M(G); andusing the modu

[ What is claimed is:] [1.] A non-recursive method for constructing balanced PN code sets for use in a code division, multiple access (CDMA) communication system, comprising steps of:applying a constrained permutation to a G x G .+-.1 valued matrix to form a modulation matrix M(G); andusing the modulation matrix M(G) to create a set of available PN codes for a first cell by modulating R unique nxn permuted code sets, c.sup.(1) (n) to c.sup.(R) (n), by successive scalar elements of M(G).