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The speed of user equipment (UE) is significant in improving the performance of orthogonal frequency division multiplexing (OFDM) systems. Estimating the speed can help in adaptively allocating resources to users, reducing call drop rate in handoff, selecting the optimal radiation pattern, etc. The Doppler spread caused by the relative movement between transmitter and receiver can be utilized to estimate...
In order to overcome the problems existing in Kalman filter(KF), extended Kalman filter(EKF) and unscented Kalman filter(UKF) in the vehicle integrated navigation system, a method is adopted to solve this problem. UKF algorithm is introduced, and an improved UKF was presented which is an adapted factor is introduced in UKF. It is shown, in vehicle integrated navigation system, UKF is superior to the...
In this letter, we propose a low complexity linear precoding scheme for downlink multiuser MIMO precoding systems where there is no limit on the number of multiple antennas employed at both the base station and the users. In the proposed algorithm, we can achieve the precoder in two steps. In the first step, we balance the multiuser interference (MUI) and noise by carrying out a novel channel extension...
A new tuning method for designing fractional order PID controllers based on radial basis function (RBF) neural networks is presented in this paper. Though fractional order PID controllers can provide better control for dynamical systems, the difficulties of designing them increase. This paper deals with the design of fractional order PID controllers by first using an existed tuning method, and then...
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