Apparatus for generating ternary spreading codes with zero correlation duration and method therefor
AssigneeElectronics and Telecommunications Research Institute
InventorJae Sang Cha
Life of this patent
Estimating the term…
Abstract
Ternary spreading codes in which side lobes near a peak of auth-correlation and cross-correlation are zero for a duration equal to or less than (0.75N+1) chips for a N chip period code are generated. The ternary spreading codes of the present invention is generated by (a) generating ternary zero correlation duration preferred pair codes, in which the zero correlation duration of (0.75N+1) chips is retained, by expanding a N chip period of a code, N being a natural number; and (b) generating a plurality of ternary zero correlation duration code sets having zero correlation characteristic equal to or less than (0.75N+1) chips by shifting the generated ternary zero correlation duration preferred pair codes in chips.
Claims21
A method for generating ternary spreading codes for use in an apparatus for generating the ternary spreading codes with zero correlation duration, the method comprising the steps of:
- (a) generating ternary zero correlation duration preferred pair codes, in which the zero correlation duration of (0.75N+1) chips is retained, by expanding an N chip period of a code, N being a natural number;
- and
- (b) generating a plurality of ternary zero correlation duration code sets having zero correlation characteristic equal to or less than (0.75N+1) chips by shifting the generated ternary zero correlation duration preferred pair codes in chips.
An apparatus for generating ternary spreading codes with zero correlation duration, the apparatus comprising:
- generating means for generating ternary zero correlation duration preferred pair codes, in which the zero correlation duration of (0.75N+1) chips is retained, by expanding a code N chip period of a code, N being a natural number;
- and
- generating means for generating a plurality of ternary zero correlation duration code sets having zero correlation characteristic equal to or less than (0.75N+1) chips by shifting the generated ternary zero correlation duration preferred pair codes in chips.
A computer readable recording medium for recording a program for implementing, in an apparatus having a processor for generating ternary spreading codes with zero correlation duration, the program comprising the functions of:
- (a) generating ternary zero correlation duration preferred pair codes, in which the zero correlation duration of (0.75N+1) chips is retained, by expanding a N chip code period, N being a natural number;
- and
- (b) generating a plurality of ternary zero correlation duration code sets having zero correlation characteristic equal to or less than (0.75N+1) chips by shifting the generated ternary zero correlation duration preferred pair codes in chips.
Dependencies are inferred from the claim text.