optimal multiuser
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Constrained Maximum-Likelihood Detection in CDMA
White Paper The detection strategy usually denoted optimal multiuser detection is equivalent to the solution of a (0, 1)-constrained maximum-likelihood (ML) problem, a problem which is known to be NP-hard. In contrast, the unconstrained ML problem can be... [10 Apr 2008]
Adaptive Resource Allocation in Multiuser OFDM Systems With Proportional Fairness
White Paper Multiuser orthogonal frequency division multiplexing (MU-OFDM) is a promising technique for achieving high downlink capacities in future cellular and wireless LAN systems. Since the optimal solution to the constrained fairness problem is extremely... [10 Apr 2008]
Multiuser Limited Feedback for Wireless Multi-Antenna Communication
White Paper Achieving this optimal capacity scaling potentially requires feedback of Channel State Information (CSI) from all users, leading to overflow of the feedback channel. It is proved that a wireless multi-antenna network using the proposed limited... [31 Aug 2007]
Multiuser Limited Feedback for Wireless Multi-Antenna Communication
White Paper Achieving this optimal capacity scaling potentially requires feedback of Channel State Information (CSI) from all users, leading to overflow of the feedback channel. It is proved that a wireless multi-antenna network using the proposed limited... [10 Aug 2007]
A Scalable Multiuser Framework for Video Over OFDM Networks: Fairness and Efficiency
White Paper The framework explores the scalability of the video codec and multi-dimensional diversity of multiuser OFDM systems to achieve the optimal service objectives subject to constraints on delay and limited system resources. [13 Apr 2007]
Optimal Resource Allocation for OFDM Multiuser Channels
White Paper In this paper, a unifying framework for Orthogonal Frequency Division Multiplexing (OFDM) multiuser resource allocation is presented. The isolated seeming problems of maximizing a weighted sum of rates for a given power budget P and minimizing sum... [11 Apr 2007]
Adaptive Resource Allocation for Delay Differentiated Traffic in Multiuser OFDM Systems
White Paper Most existing work on adaptive allocation of subcarriers and power in multiuser OFDM systems has focused on homogeneous traffic consisting of delay-constrained data (guaranteed service) or delay-tolerant data (best-effort service) only. [11 Apr 2007]
MaxWeight Scheduling for Multiuser OFDM
White Paper Multiuser OFDM is a promising multiple access technique that can be used to achieve higher data rates in the broadcast channel. This paper discusses Multiuser OFDM scheduling rules through the framework of queue stability. [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. The paper presents the conditions for optimal subcarrier assignment and power allocation based on... [11 Apr 2007]
Joint Allocation of Subcarriers and Transmit Powers in a Multiuser OFDM Cellular Network
White Paper The authors develop a distributed solution to find the globally optimal allocation which determines the subcarrier and power allocation dynamically. This paper considers the problem of joint bandwidth (subcarriers) and power allocation for the... [11 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. There performance is comparable to that of the optimal ML... [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. Therefore various detection techniques, e.g.maximum SNR, subspace, constrained optimization, Iterative Least Squares with... [08 Nov 2006]
Performance of Channel Estimation Assisted Linear Multiuser Receivers for Downlink CDMA Systems With Long Spreading Codes
White Paper Due to channel estimation error, those receivers show perturbed performance compared with their optimal counterparts. With availability of spatial/temporal diversity in the downlink of long code CDMA systems, subspace technique has been shown to be... [07 Nov 2006]
Asymptotic Analysis of the Conventional Decision Feedback Receiver in Flat Fading Channels
White Paper For the DS-CDMA systems spectral efficiency has been derived for optimal and linear multiuser receivers in case of synchronous reception, fading and non-fading environment as well as single and multi-cell cellular networks. [07 Feb 2006]
Near-Optimal Convolutionally Coded Synchronous CDMA With Iterative Multiuser Detection/Decoding
White Paper This paper considers a convolutionally coded synchronous DS-CDMA system with iterative multiuser detection and decoding. Each user's bits are convolutionally encoded, interleaved, and differentially encoded before being transmitted over the... [12 Jan 2006]
