Optimal Beamforming for Multi-antenna Relaying Schemes in Cognitive Radio Networks
-
Fangjun Zhu
and
Maotian Zhang
Abstract
This paper studies the optimal beamforming design for a cognitive relay network in which a secondary network transmits its data using a multi-antenna relay simultaneously with the primary users over the same spectrum. An optimal beamforming approach is proposed to maximize the received signal-to-noise ratio (SNR) of the secondary users, whereas the received interference power at the primary user is kept below a predefined threshold. The maximization of the SNR at the secondary users is derived as an objective function to fumulate a constrained beamforming optimization problem, and the optimization problem can be transformed into a Rayleigh-Ritz ratio problem which is then solved by the generalized singular-value decomposition in a closed form. In response to the practical problem that perfect instantaneous channel state information (CSI) is difficult to be available, we assume that partial CSI is available in the proposed method. Simulation results show that the performance can be further improved by either decreasing the uncertainty in channel coefficients or increasing the number of relay antennas.
©[2013] by Walter de Gruyter Berlin Boston
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Articles in the same Issue
- Masthead
- Compact Microstrip Low-pass Filter with Wide Stop-band and Sharp Roll-off
- Design of a Circular Polarized Horn Antenna with an Anisotropic Metamaterial Slab
- Optimal Beamforming for Multi-antenna Relaying Schemes in Cognitive Radio Networks
- Performance Analysis of Dual-hop MIMO Relay Systems with MRT&RAS in the Presence of Co-channel Interference
- Joint Network Selection and Discrete Power Control in Heterogeneous MIMO Networks: A Game Theoretical Approach
- Red-Black Tree Based Fast and Accurate Ray Tracing for Indoor Radio Wave Prediction
- Influence of Intra-cell Connections on the Traffic Calculation of Radio Resources in Mobile Network
- Threshold Determining for MinabsLLR Stopping Criterion for Turbo Codes
- A Wideband Super Source Follower with Improved Performance and Its Application
- Low Voltage Low Power Quadrature LC Oscillator Based on Back-gate Superharmonic Capacitive Coupling
