Discrete-time control systems
Multiuser Detection
A Nash game algorithm for SIR-based power control in 3G wireless CDMA networks
IEEE/ACM Transactions on Networking (TON)
Cross-layer design for the physical, MAC, and link layer in wireless systems
EURASIP Journal on Advances in Signal Processing - Special issue on signal processing applications in network intrusion detection systems
Energy-efficient resource allocation in multipath CDMA channels with band-limited waveforms
IEEE Transactions on Signal Processing
Variance minimization stochastic power control in CDMA systems
IEEE Transactions on Wireless Communications
A Unified Approach to Power control in Large Energy-Constrained CDMS Systems
IEEE Transactions on Wireless Communications
Cross-layer design for wireless networks
IEEE Communications Magazine
Joint Receiver and Transmitter Optimization for Energy-Efficient CDMA Communications
IEEE Journal on Selected Areas in Communications
A framework for uplink power control in cellular radio systems
IEEE Journal on Selected Areas in Communications
Adaptive power control for wireless networks using multiple controllers and switching
IEEE Transactions on Neural Networks
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In Code Division Multiple Access (CDMA) radio environments, the maximum number of supportable users per cell is limited by multipath fading, shadowing, multiple access interference and near-far effects which cause fluctuations of the received power at the base station. In this context, power control and signal detection are essential to provide satisfactory Quality of Service (QoS) and to combat the near-far problem in CDMA systems. In this paper, we raised the uplink power control problem for a generalize asynchronous direct-sequence (DS) CDMA system that explicitly incorporate into the analysis: (1) the propagation delays in the network (generally neglected in the literature), (2) the adverse effect of multipath fading for wireless channels, and (3) the asynchronous transmissions in the uplink channels. This framework is used to propose a distributed power control strategy enhanced with linear multiuser receivers. It is shown that through a proper selection of an error function, the nonlinear coupling among active users is transformed into individual linear loops. A Linear-Quadratic-Gaussian (LQG) power control strategy is derived and compared with other approaches from the literature. Simulation results show that the uplink channel variations do not destroy the stability of these power control structures. However, delays in the closed-loop paths can severely affect the stability and performance of the resulting feedback schemes. It is also shown that the use of multiuser detection at the base station can bring significant improvements to the performance of power control.