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In this letter, we investigate the optimal EH-ratio and beamwidth selection in millimeter wave (mmWave) communications. Specifically, users in mmWave communications operate in slotted mode, where each frame consists of three continuous segments—energy harvesting, beam-searching, and data transmissions. In this sense, we propose a joint optimal EH-ratio and beamwidth selection scheme by maximizing...
In this paper, we investigate a preference-aware multicast mechanism in active array aided LTE (Long Term Evolution) networks. An active antenna system can direct vertical beams in different horizontal and vertical directions, so the amount of energy delivered is more concentrated on the target users. Employing the active array, each multicast group is provided with an individual beam with specific...
We investigate the outage performance of multi-antenna cognitive wireless relay networks where source nodes transmit information to their destinations via two hops facilitated by intermediate cognitive nodes able to acquire spectrum holes. In particular, we conduct an outage performance analysis for a decode-and-forward (DF) relaying system under three scenarios which are depending on the spectrum...
A novel channel estimation scheme based on superimposed training is proposed for space time block coded (STBCO) multi-band (MB) orthogonal frequency division multiplexing (OFDM) ultra-wideband (UWB) systems. The optimal training symbols are derived with respect to the least square (LS) channel estimate mean square error (MSE). Simulation shows that the proposed scheme benefits much higher effective...
Outage probability for cognitive radios is investigated in this paper. The scenario under consideration requires the cognitive radio to sense whether the primary user (PU) link is free (or exists a spectrum hole) before making an active transmission using that link. The use of multiple antennas at the cognitive receiver provides array gains at the sensing stage. We derive a closed-form outage probability...
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