Use of chip repetition to produce a flexible bandwidth DS-CDMA system

A method for obtaining a spreading code set for a code division multiple access communications system, comprising:

• generating a P′×P′ spreading code set where P′=P/N, where P is the spreading gain in chips/symbol and where N is an integer multiple of 2;
• and
• replicating chips in each spreading code by N to produce a P′×P spreading code set.

A method for generating a spreading code set for use in a deployment of a synchronous, direct sequence code division multiple access communications system, comprising:

• generating a P′×P′ Hadamard spreading code set where P′=P/N, where P is the spreading gain in chips/symbol and where N is an integer multiple of 2, the P′×P′ Hadamard spreading code set requiring a channel bandwidth of X Hz for operation;
• and
• replicating chips in each spreading code by N to produce a P′×P spreading code set that requires a channel bandwidth of Y Hz for operation, where Y<X.

In a synchronous, direct sequence code division multiple access communications system, a memory device that stores a spreading code set generated from a (P/N)×(P/N) Hadamard spreading code set, where P is the spreading gain in chips/symbol and N is an integer multiple of 2, the stored spreading code set being generated from the Hadamard spreading code set by repeating chips in each spreading code of the Hadamard spreading code set by a factor of N to produce a (P/N)×P spreading code set that requires a channel bandwidth of Y Hz for operation, where Y<X and X is the channel bandwidth required for operation by the Hadamard code set.