Comparison of Different Spreading Sequences and Codes for Joint Communication and Sensing

In this work, different spreading sequences are presented and investigated with regard to their usability in joint communication and sensing (JCAS) systems. Gold codes, Kasami codes, maximum-length sequences (m-sequences) and Zadoff-Chu sequences are compared with each other in terms of dynamic range (DR), number of sequences in their subset and cross-correlation (CC) properties. Radar measurements were performed to prove the theoretical results. M-sequences and Zadoff-Chu sequences have the best DR. For a sequence length of 1023, the m-sequence achieved a DR of 57.2 dB. The Zadoff-Chu sequence suffers more from hardware non-idealities than m-sequences. The disadvantage of these two sequences is the high CC within their code family, which prohibits the use of this sequence in a network with many different participants. Gold codes and Kasami codes have a better CC but a very limited DR.