A novel design method of digital-digital sequences in DS/CDMA code-diversity systems

This paper presents a novel design method of digital-digital sequence (DDS) for code-diversity systems in direct sequence / code division multiple access (DS/CDMA). In the DDS, both the branch sequences and the composite sequence can be constructed from digital signal, then, the code-diversity can be realized easily. To suppress interference effectively, the design method of arrangement in element sequences is needed for DDS. Sequential rearrangement is operated by evaluation for weight coefficients of diversity branches in training time. Desirable sequence design can be achieved shortly in this method. As a result, considerable improvements of bit error rate(BER) performances are shown by computer simulations.