Abstract:

Basic link space code (LS) code has interference free window (IFW) and is used by traditional large area synchronous-code division multiple access (LAS-CDMA) system, but this IFW is not uniformly distributed. Using kronecker product of matrix theory, basic link space code chips are recombined and a new kind of LS code is obtained. These new codes have a uniform IFW for both aperiodic auto-correlation and cross-correlation function within one group, and the aperiodic cross-correlation function between groups either has uniform IFW or perfect complement. These properties are proved by both mathematics and computer simulation.

Key words: interference free window, multiple access interference, large area synchronous-code division multiple access, link space code