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Cognitive radio systems based on non-contiguous orthogonal frequency division multiplexing (NC-OFDM) is a promising technique that can provide efficient bandwidth utilization for high data rate wireless communication systems under frequency selective fading environments. Nevertheless, the sidelobe power of the secondary users (SU) in NC-OFDM modulated signals create out-of-band power (OBP) which induce...
In this paper, we propose a method for joint estimation of carrier frequency offsets (CFO) of multiple active users in an orthogonal frequency division multiple access (OFDMA) uplink using the recently-developed bat algorithm. An initialization technique that can drastically reduce the total computational complexity of joint maximum likelihood (ML) estimation problems is employed to make the metaheuristic...
The force and moment at ankle, hip and knee joints are determined based on reaction forces and moments acting at those joints. The reaction forces and moments developed at these joints are due to the ground reaction forces at the foot. These ground reaction forces are measured using force plates. And using newton's equations of motion, the forces and moments at ankle, knee and hip joints are calculated...
This paper focuses on the design of a Laguerre function based Model Predictive Control (MPC) for simultaneous tracking and vibration control of a flexible joint manipulator. A single link flexible joint manipulator is considered and the dynamic model of the system is derived using Lagrangian approach. The singular perturbation approach is exploited to obtain the two time-scale decomposition of this...
In this paper, optimal multiuser downlink cooperative beamforming in spectrum underlay based cognitive radio network is considered with target SINR and sum power constraints. In existing works, transmit beamforming vectors for maximum number of admitted secondary users are designed with fixed target SINR and sum power constraints. However, this joint optimization problem becomes infeasible as some...
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