A modified linear decorrelating detector for asynchronous CDMA

Although the linear decorrelating detector (LDD) is theoretically a simple scheme for the detection of asynchronous CDMA, its practical implementation is still too complicated and it may have long detection delay. One-shot LDD has a simpler architecture and almost no detection delay, but it could lead to significant noise enhancement, and hence degraded near-far resistance (NFR) than the standard LDD. In this paper, a modified LDD (MLDD) is proposed. With controllable complexity and detection delay, the MLDD has smaller noise enhancement than the one-shot LDD and its NFR can approach that of the standard LDD.