The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title:	On adaptive code division multiple access detectors
Author:	Chen, Wenping
View Online:	njit-etd1995-047 (xi, 88 pages ~ 2.7 MB pdf)
Department:	Department of Electrical and Computer Engineering
Degree:	Doctor of Philosophy
Program:	Electrical Engineering
Document Type:	Dissertation
Advisory Committee:	Siveski, Zoran (Committee chair) Ansari, Nirwan (Committee member) Bar-Ness, Yeheskel (Committee member) Blackmore, Denis L. (Committee member) Maric, Svetislav Vojislav (Committee member)
Date:	1995-01
Keywords:	Detectors. Code division multiple access.
Availability:	Unrestricted
Abstract:	Several variations of adaptive CDMA synchronous receiver schemes which can automatically adjust to the system parameters, are studied in this dissertation. Unlike their non-adaptive counterparts, these adaptive detectors require no knowledge of the received signals' energies and have similar or better performance. Minimum energy and decorrelating criterion are used to update the weights. Since weights are updated according to the changes of the detector's outputs, hence no training sequence is required. The convergences of some of the aforementioned adaptive detectors are also disscussed. The detectors proposed in this dissertation are near-far resistant,thus rendering the high-precision power control unnecessary. Among them, the two-stage adaptive detector with a soft tentative decision is worth mentioning. It combines the advantages of two different two-stage detectors and approaches the performance of the optimum detector, but with much less complexity.