optimal multiuser
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Optimal Power Control for Multiuser CDMA Channels
White Paper The SIR is modeled in a multiuser CDMA system with fixed linear receiver and signature sequences. This paper defines the power region as the set of power allocations for K users such that everybody meets a minimum Signal-to-Interference Ratio (SIR). [16 Jun 2006]
A Unified Power Control Algorithm for Multiuser Detectors in Large Systems: Convergence and Performance
White Paper A unified approach to energy-efficient power control, applicable to a large family of receivers including the matched filter, the decorrelator, the (linear) Minimum-Mean-Square-Error detector (MMSE), and the individually and jointly optimal... [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 average transmit power while... [16 Jun 2006]
Reduced Complexity Joint Iterative Equalization and Multiuser Detection in Dispersive DS-CDMA Channels
White Paper Joint maximum a posteriori probability equalization and multiuser detection with error control decoding can be used to mitigate this interference and to achieve the optimal bit error rate. Unfortunately, such optimal detection typically requires... [16 Jun 2006]
Impact of Channel Estimation Errors on Multiuser Detection Via the Replica Method
White Paper In this paper, the impact of channel estimation errors on MultiUser Detection (MUD) is analyzed under the framework of the replica method. System performance is obtained in the large system limit for optimal MUD, linear MUD and turbo MUD, and is... [16 Jun 2006]
Block-Adaptive Kernel-Based CDMA Multiuser Detection
White Paper The paper investigates the application of a recently introduced learning technique, referred to as the relevance vector machine (RVM) to construct a block-adaptive kernel-based nonlinear multiuser detector (MUD) for direct-sequence code-division... [27 Jul 2005]
Randomly Spread CDMA: Asymptotics Via Statistical Physics
White Paper This paper studies randomly spread code-division multiple access (CDMA) and multiuser detection in the large-system limit using the replica method developed in statistical physics. A generic multiuser detector in the form of the posterior mean... [26 Jul 2005]
A Sub-Optimal Joint Subcarrier and Power Allocation Algorithm for Multiuser OFDM
White Paper This paper investigates subcarrier and power allocation in multiuser OFDM. Achieving the optimal solution is computationally demanding thereby necessitating the use of suboptimal techniques. Existing sub-optimal techniques either use fixed power... [21 Jul 2005]
Capacity Analysis on Downlink MIMO OFDMA Systems
White Paper To achieve the capacity bound however, one must solve a multiuser subcarrier allocation and the optimal power allocation jointly. Motivated by the increasing popularity of OFDMA and MIMO, this paper studies the capacity of MIMO enabled OFDMA system... [02 Nov 2004]
On the Optimality of the OFDMA Network
White Paper It is proved that in the multiuser multicarrier downlink system with independent decoding, OFDMA is the optimal multiple access scheme. This paper studies the optimality of the OFDMA network. It is also shown that the optimality of OFDMA holds for... [02 Nov 2004]
Optimal Power Allocation in Multiuser OFDM Systems
White Paper Multiuser orthogonal frequency division multiplexing (MU-OFDM) is a promising technique for achieving high downlink capacities in future cellular systems. A key issue in MU-OFDM is the allocation of the OFDM subcarriers and power among users... [28 Oct 2004]
Channel Estimation and Multiuser Detection for Long Code CDMA
White Paper Since the method depends on eigenvalue decomposition on the data covariance matrix, which is typically estimated from finite data samples, the optimal solution is then perturbed. In a long code CDMA system, subspace technique is directly applied to... [01 Aug 2004]
Optimal Power Control for CDMA Systems in the Wideband Limit
White Paper Traditional methods for solving multiuser control problems in CDMA systems do not scale well as the number of users in the system increases. The simplified evolution dynamics can then be used to construct a dynamic program that solves for the... [24 Jul 2004]
