Fundamentals of statistical signal processing: estimation theory
Fundamentals of statistical signal processing: estimation theory
Microwave Mobile Communications
Microwave Mobile Communications
Aware, Adaptive and Cognitive Radio: The Engineering Foundations of Radio XML
Aware, Adaptive and Cognitive Radio: The Engineering Foundations of Radio XML
Fitness landscape analysis for resource allocation in multiuser OFDM based cognitive radio systems
ACM SIGMOBILE Mobile Computing and Communications Review
Optimal transmitter eigen-beamforming and space-time block coding based on channel mean feedback
IEEE Transactions on Signal Processing
Adaptive MIMO-OFDM based on partial channel state information
IEEE Transactions on Signal Processing
Adaptive OFDM Systems With Imperfect Channel State Information
IEEE Transactions on Wireless Communications
Exact pairwise error probability of space-time codes
IEEE Transactions on Information Theory
Spectrum pooling: an innovative strategy for the enhancement of spectrum efficiency
IEEE Communications Magazine
Multiuser OFDM with adaptive subcarrier, bit, and power allocation
IEEE Journal on Selected Areas in Communications
Transmit power adaptation for multiuser OFDM systems
IEEE Journal on Selected Areas in Communications
Cognitive radio: brain-empowered wireless communications
IEEE Journal on Selected Areas in Communications
Sensing Confidence Level-Based Joint Spectrum and Power Allocation in Cognitive Radio Networks
Wireless Personal Communications: An International Journal
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In wireless communications, the assumption that the transmitter has perfect channel state information (CSI) is often unreasonable, due to feedback delays, estimation errors, and quantization errors. In order to accurately assess system performance, amore careful analysis with imperfect CSI is needed. In this paper, the impact of partial CSI due to feedback delays in a multiuser Orthogonal Frequency Division Multiplexing (MU-OFDM) cognitive radio (CR) system is investigated. The effect of partial CSI on the bit error rate (BER) is analyzed. A relationship between the transmit power and the number of bits loaded on a subcarrier is derived which takes into account the target BER requirement. With this relationship, existing resource allocation schemes which are based on perfect CSI being available can be applied when only partial CSI is available. Simulation results are provided to illustrate how the system performance degrades with increasingly poor CSI.