Abstract-In this paper, a blind multiuser detector based on Lagrange neural network (LNN) is proposed. Based on the minimum output energy (MOE) criterion, the blind detection algorithm is formulated as a constrained optimization problem inherently and then resolved efficiently using neural network. It is shown that compared with previous MOE blind detector, the proposed LNN blind multiuser dete...

A multistage multiuser detector (MMD) is presented for frequency hopping/code division multiple access (FH/CDMA.) The MMD reduces the bit error rate over the conventional detector by exploiting prior knowledge of the addresses and energies of the users. This detector is a conservative multiuser detector which is robust to unknown users and is only linear in complexity in the number of users. Th...

Abstract--Space-time multiuser detection (STMD) is an emerging technique for wideband CDMA mobile communication systems, where the problems of the multiuser access interference (MUAI) and the inter-symbol interference (ISI) can be solved simultaneously. However, the complexity becomes one of the key problems in its practical implementation because of the exponential increment of computation bur...

An approach to optimal soft decoding for vector quantization (VQ) over a code-division multiple-access (CDMA) channel is presented. The decoder of the system is soft in the sense that the unquantized outputs of the matched filters are utilized directly for decoding (no decisions are taken), and optimal according to the minimum mean-squared error (MMSE) criterion. The derived decoder utilizes a ...

We propose a low complexity CDMA multiuser delay tracking receiver as an alternative to the more complex extended Kalman filter (EKF) based CDMA multiuser delay trackers. It integrates delay-tracking into CDMA multiuser detection by the delay-robust successive interference cancellation (SIC) technique, which was initially proposed for robust CDMA multiuser detection when there exists time delay...

OF THE DISSERTATION Noncoherent Multicarrier Communications and Multiuser Detection by Rajnish Sinha Dissertation Director: Professor Roy D. Yates The Internet revolution has created the need for wireless technologies that can deliver data at high speeds in a spectrally efficient manner. However, supporting such high data rates with sufficient robustness to radio channel impairments requires ca...