multiuser
RSS multiuserSpace-Time Interference Cancellation in MIMO-OFDM Systems
White Paper The framework is developed specifically for spatial multiplexing and is applied to multiuser MIMO-OFDM systems with asynchronism between users as well as to single-user MIMOOFDM systems. In this paper, a two stage hybrid... [11 Apr 2007]
Opportunistic Feedback in Clustered OFDM Systems
White Paper The main advantage of this protocol is that it achieves multiuser diversity with only a small amount of feedback overhead. This paper proposes a random access based feedback protocol for the clustered Orthogonal... [11 Apr 2007]
Optimizing Performance of Adaptive Server Enterprise 12.5 on Linux
White Paper Linux is an extremely powerful, multitasking, multiuser, secure operating system. It has all the features of an enterprise operating system, including virtual memory, shared libraries, proper memory management, and... [03 Apr 2007]
Multiuser Detection in DS-CDMA
White Paper The project discussed in this paper looks into suboptimal receivers for multiuser detection in CDMA systems. The optimal ML receiver has too high a complexity to be used in practice. For real time implementation the user... [10 Nov 2006]
Computationally Efficient Multiuser Detection for Aperiodically Spreading CDMA Systems
White Paper Multiuser CDMA systems with aperiodic spreading codes have received considerable attention. One major difficulty in multiuser detection is the user's time-varying signature. In this paper,... [09 Nov 2006]
On Multiuser Detection for Low-Rank CDMA Systems
White Paper The authors revisit suboptimum linear and group detection for CDMA systems and focuses on "Over-loaded" or low-rank CDMA systems wherein the total number of signals can be larger than the dimension of the signal space. [09 Nov 2006]
Blind Adaptive Multiuser Detection for Uplink Long-Code CDMA Systems
White Paper In the uplink of a long-code CDMA system, base station knows spreading codes of all serviced users. Given propagation delays, a blind adaptive Constant Modulus Algorithm (CMA)-based approach, with the aid of a set of MMSE-like... [09 Nov 2006]
Asymptotically Optimal CDMA Receiver: Perfect MAI Cancellation
White Paper Multiple Access Interference (MAI) as well as multipath distortions are two major obstacles in multiuser communication. The MAI in the received data vectors can be eliminated by projecting the received data onto the... [09 Nov 2006]
Multiuser Detection for Overloaded CDMA Systems
White Paper Multiuser detection for overloaded CDMA systems, in which the number of users is larger than the dimension of the signal space, is of particular interest when bandwidth is at a premium. In this paper, certain fundamental... [08 Nov 2006]
Performance of Channel Estimation Assisted Linear Multiuser Receivers for Downlink CDMA Systems With Long Spreading Codes
White Paper With availability of spatial/temporal diversity in the downlink of long code CDMA systems, subspace technique has been shown to be able to estimate channel parameters. Based on the estimated channel, the authors construct three typical... [08 Nov 2006]
Oracle Versus SQL Server in the Enterprise
White Paper Having to manage an enterprise-class system (SAP), the author prefers to use a multiuser database. After all, there are plenty of customers using SQL Server in a multiuser environment. As an Oracle DBA... [23 Jun 2006]
A Low-Complexity Enhancement to Suboptimal CDMA Receivers
White Paper However, most multiuser detectors suffer from their relatively complex implementations. The proposed post-detection error control method is shown to substantially improve the performance of the conventional detector, but... [16 Jun 2006]
Optimal Link Adaptation in Wideband CDMA Systems
White Paper In this paper a general framework is developed for optimizing link adaptation for multiuser CDMA systems in the wideband limit. The framework is then used to solve for the optimal power control policy that minimizes... [16 Jun 2006]
Transmit Selection Diversity for Unitary Precoded Multiuser Spatial Multiplexing Systems With Linear Receivers
White Paper Multiuser spatial multiplexing is a downlink transmission technique that uses linear transmit pre-coding to multiplex multiple users and pre-cancel inter-user interference. In this paper, the downlink of a... [17 May 2006]
Joint Frequency Offset Estimation and Interference Cancellation for MIMO-OFDM Systems
White Paper Synchronization and equalization in wireless multiuser MIMO-OFDM (Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing) systems is important for next generation wireless communication. [17 May 2006]
