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In this paper, we propose a low-complexity genetic algorithm (GA) to deal with the joint antenna selection (AS) and power allocation (PA) problem in multiple-input multiple-output systems with space time block coding and spatial multiplexing. The proposed GA is aimed to solve the joint AS and PA problem by maximizing the channel capacity under a fixed total transmission power constraint. At the first...
This paper is aimed to develop a low-complexity receiver by treating Doppler rate (phase offset) as nuisance parameter in the hybrid channel estimation. For slowly changing channels, two simple adaptive equalization schemes, based on least squares (LS) and minimum mean-squared error (MMSE) principles, are proposed. For fast-changing channels, we adopt pilot-based channel estimation for equalization...
This paper presents three multiuser detectors (MUDs) for the uplinks of spatial-frequency-time-domain (SFT-domain) spread multi-carrier (MC) direct sequence code division multiple access (DS-CDMA) systems. First, aiming at achieving significant performance gain, we propose a joint optimum SFT-domain MUD based on minimum mean square error (MMSE) decision rules. Further, to reduce the computational...
In this paper, we propose a direct mapping (DM) orthogonal frequency division multiplexing (OFDM) based transmission scheme for underwater acoustic multimedia (UAM). We adopt DM multi-input multi-output (MIMO), power assignment mechanism, OFDM, adaptive modulation, and unequal error protection in the UAM system. The proposed underwater acoustic multimedia system employs high power, low speed modulation,...
In this paper, we present an angle tracking algorithm based on the extended Kalman particle filter (EKPF), called EKPF-AT, using an array of sensors with known locations. This algorithm is capable of determining DOA angles using a single snapshot of data during the interval between each time step. The EKPF combines particle filtering (PF) with the extended Kalman filter (EKF) in order to prevent sample...
Underwater acoustic (UWA) communications have drawn attention to many researchers in recent years. The major obstacles to reliable UWA communications include limited bandwidth, long multipath delay and large Doppler shifts of the UWA channel. Due to the hostile UWA environment, implementation of a high-speed UWA communication system often requires advanced modulation and signal processing techniques...
In this paper, a fast subspace extended cyclic MUSIC algorithm is presented for DOA estimation of cyclostationary signals. The proposed method replaces the singular value decomposition required in the extended cyclic MUSIC algorithm with the matrix inverse-free version of the fast rational approximation algorithm. It has comparable resolution power, less accuracy, and lower computational complexity...
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