SPREAD CODE SEQUENCE GENERATING APPARATUS FOR SPREAD SPECTRUM COMMUNICATION

摘要

PROBLEM TO BE SOLVED: To provide a code sequence generating apparatus for generating a plurality of spread code sequences having inter cross correlation within a prescribed range and having a prescribed inter code phase relation.

SOLUTION: The spread code sequence generating apparatus includes a plurality of stages including a first stage and a final stage, wherein each stage has: a linear feedback shift register (LFSR) for demarcating a tap for generating a tap signal, applying a prescribed tap signal group to a logic circuit where the signals are composed and a feedback spread signal for input to the first stage is produced; a memory means being a first memory means for storing a plurality of spread code seeds, connected to the LFSR, and for respectively transferring each of a prescribed set of the spread code sequences of the spread code seed to be selected in response to a load signal; and a code generating unit control means for selecting one of a plurality of the spread code seeds and producing the load signal corresponding to the spread code. The LFSR transfers the tap signal from one stage to the next, transfers the feedback spread code value to the first stage, and demarcates a master spread code sequence by each of consecutive tap signal values of the final stage.

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