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/sup J/(J-2)/(2log/sub 2/3)-1+1/log/sub 2/3 and (J-1)2/sup J-2//log/sub 2/3 spreading sequences of length 2/sup J-1/D+2/sup J/-1 for quasi-synchronous and asynchronous systems respectively.