multiuser
RSS multiuserJoint Allocation of Subcarriers and Transmit Powers in a Multiuser OFDM Cellular Network
White Paper This paper considers the problem of joint bandwidth (subcarriers) and power allocation for the downlink of a multi-user multi-cell OFDM cellular network. This resource allocation problem is formulated as a power minimization problem, subject to... [11 Apr 2007]
Adaptive Resource Allocation and Scheduling for Multiuser Packet-Based OFDM Networks
White Paper As it moves towards the next generation wireless communications systems featured by all IP-based protocols and heterogeneous traffic calls, new issues arise in designing resource management algorithms. [11 Apr 2007]
Adaptive Subcarrier and Power Allocation in OFDM Based on Maximizing Utility
White Paper This paper investigates adaptive resource allocation on the downlink of multiuser OFDM networks to achieve both multiuser diversity and fairness. Utility functions are applied to quantify the level of users' satisfaction derived from the radio... [11 Apr 2007]
Group OFDM Technique for Beyond 3G
White Paper However, there are still unsolved problem for multiuser case, especially in publice large coverage cellular system. MIMO and OFDM are considered as the dominant techniques for future wireless communication. [11 Apr 2007]
MU-OFDM Power and Subchannel Allocation Performance on DSP
White Paper One relatively new topic in OFDM is multiuser access to a basestation transmitter. Orthogonal Frequency Division Multiplexing (OFDM) offers an increased data rate capacity in wireless systems by dividing a large amount of bandwidth into smaller... [11 Apr 2007]
Space-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 interference cancellation... [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 Frequency Division Multiplexing... [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 TCP/IP networking. [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 requires the detectors to... [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, multiuser detection is performed by a two-step approach... [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 constraints... [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 subspace orthogonal to code... [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 questions are answered... [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 linear... [08 Nov 2006]
