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We consider the coexistence of a secondary user with a single-antenna primary link which is not fully loaded. The secondary user has multiple antennas and performs spatial shaping. First we consider the case when single-user decoding is deployed at the cognitive receiver. By spatial shaping, the secondary user can optimize its achievable rate under the rate constraint of the primary user, and a closed-form...
We study beamforming strategies for a friendly jammer (or helper) in a MISO wiretap channel. We characterize the beamforming strategy for the maximization of the secrecy rate and analyze the optimality of zero forcing. We show that zero forcing is optimal up to a small constant for high SNR. For low SNR, we derive optimal beamforming strategies for transmitter and helper in terms of minimum Eb/N0...
Physical resource sharing between wireless operators and service providers is necessary in order to support efficient, competitive, and innovative wireless communication markets. By sharing resources, such as spectrum or infrastructure, which are usually exclusively allocated interference is created on the physical layer. Therefore, the economic gains, regulatory overhead, and engineering efforts...
The design of wireless sensor networks requires cross layer optimization of sensing, signal processing and communication. We consider the linear decentralized estimation model in which low complex sensors sense, amplify, and forward the noisy and scaled observation of a source variable via a multiple-access channel (MAC) to the fusion center (FC), where the FC has perfect channel state information...
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