| Popis: |
The CCSDS standard for CDMA services between Data Relay (GEO) and LEO satellites can optionally be used by a member agency for direct-to-earth link. In the return services related to Non-coherent mode of this standard, the possible modulation for DG1 Mode 2 is SS-BPSK and length of each code is 2047 bits.In this paper, we explain a method which deals with derivation of a code set with truncated lengths from a code set of standard length (2047 bits), for suitability to hardware realization. The degradation in the cross correlation property of the codes caused due to truncation is mitigated by our method of optimizing on the cross correlation protection achieved through computer search for appropriate codes from this derived code set. |
