Code constructions for nonasynchronous-CDMA systems

Code constructions for quasi-synchronous and asynchronous code-division multiple-access (CDMA) systems with finite delays are presented in this paper. With all transmitted sequences reaching the receiver within a finite delay of D digits, for each J, there are at least 2^J(J-2)/(2log_2/3)-1+1log₂3 and (J-1)2^J-2/log₂3 spreading sequences of length 2 ^J-1D+2^J-1 for quasi-synchronous and asynchronous systems respectively