A large set of orthogonal codes for the V2V scenario

Abstract

This paper investigates the use of binary De Bruijn sequences as vehicle signatures in a vehicular CDMA communication framework, over Rayleigh and Weibull distributed fading channels. Orthogonal De Bruijn codes are able to outperform Orthogonal Variable Spreading Factor sequences, whereas it is shown that their inherent Zero Correlation Zone does not provide any significant advantages in the presence of severe fading.

Full-length non-linear binary sequences with Zero Correlation Zone for multiuser communications

“…Well-known families of linear spreading sequences, such as m-sequences, Kasami, Gold, and Walsh codes, traditionally employed as channelization codes, exhibit non-zero and sometime non negligible auto-and cross-correlation out-of-phase values, which limit the achievable performance, in asynchronous or in quasisynchronous scenarios [11]. On the other hand, full length sequences obtained through non-linear generation, such as binary De Bruijn (DB) sequences [12], [13], provide attractive features as well, such as long periods and large complexities, great cardinality of the set [14], and good randomness properties, that can be fruitfully exploited in communication systems, coding theory, and cryptography [15].…”