| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a restriction that the code length of a producible diffusion code is limited to exponentiations of two by producing plural delay outputs whose delay times are different from one anther from a reference diffusion code series and producing a new diffusion code series having a code length which is an integer multiple to the reference diffusion code series by means of time division multiplexing. SOLUTION: A reference PN code generator 1 generates a reference pseudo- random (reference PN) code series. A branching device 2 branches a reference PN code series which is produced and outputted by the generator 1 into n pieces of code series. (N-1) pieces of delaying devices (3 (0), 3 (1),...3 (n-2)) whose number is smaller than a branch number (n) by one are provided. A time division multiplexer 4 performs time division multiplexing of inputs which are given from the device 2 and the devices 3 and are n pieces in all within one symbol section of the reference PN code series. That is, a new PN code series that is n times as long as the code length of the reference PN code series is outputted by performing n multiplexing within one symbol section. |
