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In this paper, we present a low-complexity power allocation scheme for non-regenerative (amplify and forward) relaying in cognitive radio systems. The main objective of the power allocation is to maximize the signal to noise ratio (SNR) at the destination under the constraint of acceptable interference to the primary users (PU). In this paper, we propose an iterative power allocation using SNR upper...
In this paper, we present a low-complexity Interference Aware Multiple Relay Selection (IAMRS) scheme for cognitive radio system. The main objective in selecting multiple relays is to maximize the SNR at the destination under the constraint of acceptable interference to the primary users (PU). The computational complexity of finding an optimal IAMRS by exhaustive search grows exponentially with the...
In this paper, we present a real-time low-complexity joint transmit and receive antenna selection algorithm for MIMO systems. We apply ant colony optimization (ACO) to the joint antenna selection problem. The computational complexity of exhaustive search in this problem grows exponentially with the number of transmit and receive antennas. The proposed ACO for joint antenna selection has a low computational...
In this paper, we study a problem of making call admission decisions for dynamically arriving call requests in multi-rate multi-class CDMA cellular systems. We limit our scope to systems that employ orthogonal variable spreading factor (OVSF) codes for providing different channels for different users -e.g., wideband CDMA. We study the optimal stationary randomized call admission control policy and...
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