SIAM Review
NeXt generation/dynamic spectrum access/cognitive radio wireless networks: a survey
Computer Networks: The International Journal of Computer and Telecommunications Networking
Orthogonal Frequency Division Multiplexing for Wireless Communications (Signals and Communication Technology)
Resource allocation in an OFDM-based cognitive radio system
IEEE Transactions on Communications
Capacity and power allocation for spectrum-sharing communications in fading channels
IEEE Transactions on Wireless Communications
IEEE Transactions on Wireless Communications
Automatic modulation classification for cognitive radios using cyclic feature detection
IEEE Circuits and Systems Magazine
LTE: the evolution of mobile broadband
IEEE Communications Magazine
OFDM for cognitive radio: merits and challenges
IEEE Wireless Communications
Transceiver optimization for block-based multiple access through ISI channels
IEEE Transactions on Signal Processing
Optimal designs for space-time linear precoders and decoders
IEEE Transactions on Signal Processing
Fundamental limits of spectrum-sharing in fading environments
IEEE Transactions on Wireless Communications
Spatial Capacity of Narrowband vs. Ultra-wideband Cognitive Radio Systems
IEEE Transactions on Wireless Communications - Part 2
Optimal and Suboptimal Power Allocation Schemes for OFDM-based Cognitive Radio Systems
IEEE Transactions on Wireless Communications - Part 2
Spectrum pooling: an innovative strategy for the enhancement of spectrum efficiency
IEEE Communications Magazine
Mobile WiMAX systems: performance and evolution
IEEE Communications Magazine
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When both primary and secondary systems are orthogonal frequency division multiplexing modulated and are non-cooperative, carrier frequency offset between the systems is inevitable to cause harmful interference. In this paper, we jointly optimize secondary transceivers assuming that the frequency offset between the secondary transmitter (ST) and the primary receiver (PR) and different channel information from the ST to the PR are known at the ST. We first derive unified interference constraints and obtain the secondary transceivers minimizing the mean square error through convex optimization techniques. We then derive closed-form transceivers for several special cases to reveal the impact of the frequency offset on the secondary transceivers. We show that when there is no frequency offset between the ST and the PR, the optimal processing at the ST is power allocation. Otherwise, both power allocation and precoding are necessary. The impact of the frequency offset on the performance of both systems increases as the interference constraints become tighter and the bandwidth of the primary system becomes smaller. When the proposed transceivers are used, the performance of the secondary system is robust to the frequency offset and the performance of the primary system degrades little due to the remanent frequency offset.