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In this letter, with the primary user's (PU's) interference, we investigate the performance of the secondary user (SU) in spectrum sharing cognitive relay networks. Considering the correlation among the received interference plus noise ratios (SINRs) at the relays and SU destination, closed-form expressions for the outage probability and capacity of the SU are derived. It is shown that, though the...
Conditioned with per-antenna power constraints, power allocation over transmit antennas must be controlled in joint optimization of transmit beamformers and receive beam-formers in multi-user multiple-input multiple-output (MIMO) downlink. In this paper, it is shown the Lagrangian dual of the per-antenna power constrained optimization problem is related to the network dual of a weighted sum power...
In this paper, packet error rate (PER) of Zigbee (IEEE 802.15.4) under the interference of radio frequency identification (RFID) is analyzed by establishing a mathematical model of the mutual interference. This proposed model takes PHY (such as the channel model, the transmitted power, the spreading and the modulation) and MAC (such as CSMA/CA, the traffic load and the packet format) into account...
The performance of Bluetooth under the interference of RFID is investigated. A mathematical model is proposed to quantify the performance degradation of Bluetooth. The proposed model carefully takes PHY (i.e., the channel model, the transmitted power, the distance and the modulation) and MAC (i.e., the frequency hopping, the packet format and the traffic load) into account. Packet error rate (PER),...
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