In this letter we introduce a direct-sequence code-division multiple access (DS/CDMA) concept which accommodates a higher number of users than the spreading factor N. Each of the available orthogonal spreading sequences of length N is assigned to one of the first N users which employ a common pseudonoise (PN) scrambling sequence. When the number of users K exceeds N, say K=N+M with M>N, the M additional users reuse M of those orthogonal spreading sequences but in combination with another PN scrambling sequence. An iterative multistage detection technique is used to cancel interference between the two sets of users when K展开▼
机译：在这封信中，我们介绍一种直接序列码分多址（DS / CDMA）概念，该概念比扩展因子N容纳更多的用户。长度为N的每个可用正交扩展序列都分配给第一个使用公用伪噪声（PN）加扰序列的N个用户。当用户数K超过N，例如K = N + M，M> N时，M个附加用户复用了那些正交扩频序列中的M个，但又与另一个PN加扰序列结合使用。当K 展开▼
