In a wireless network comprising some receivers and a truth-teller transmitter, an attacker adds a malicious evil-twin transmitter to the network such that the evil-twin lies about its true identity and transmits like the truth-teller transmitter in the network. The truth-teller transmitter may be a malicious transmitter as well, but it is honest in that it doesn’t lie about its identity. The e...

We study the asymptotic capacity of MIMO wireless channels predicated on channel knowledge (or channel state information CSI) at the transmitter in the high SNR regime. The transmitter CSI studied includes instantaneous and transmit correlation types. The receiver is assumed to know the channel perfectly. Analytical expressions for the asymptotic ergodic capacity are derived in each case, which...

This paper proposes modifications to the tradional Ceiling Bounce Model and uses it to characterize diffuse indoor optical wireless channel by analyzing the effect of transceiver position on signal propagation properties. The modified approach uses a combination of the tradional ceiling bounce method and a statistical approach. The effects of different transmitter-receiver separations and heigh...

Transmitter diversity and down-link beamforming can be used in high-rate data wireless networks with orthogonal frequency division multiplexing (OFDM) for capacity improvement. In this paper, we compare the performance of delay, permutation and space–time coding transmitter diversity for high-rate packet data wireless networks using OFDM modulation. For these systems, relatively high block erro...

ARQ (Automatic Repeat reQuest) is used to ensure a reliable communication between transmitter and receiver over an error-prone channel. When the transmitter sends a data packet over the channel to the receiver, a transmission error may occur depending on the condition of the channel. The receiver checks the integrity of the packet and notifies the transmitter by returning a NACK in case of erro...

Wireless charging technology is built into a variety of devices. However, each these products use dedicated wireless charger, so when it comes to making better organizational space, being able charge various devices with one transmitter desirable. In this letter, we propose Bernoulli spiral coil that can efficiently smart sizes. Our analysis shows the proposed maintain certain coupling coeffici...

This is a tutorial article presenting comparison between single input single output and multi input multi output wireless channel. We have compared Shannon ergodic capacity of SISO link and its different realizations with MIMO wireless channel. It is shown that wireless channel capacity increases linearly with the increase of multiple antennas both at transmitter and receiver. MIMO wireless lin...

Transmitter switching can provide resiliency and robustness to a communication system with multiple energy harvesting transmitters. However, excessive transmitter switching will bring heavy control overhead. In this paper, a geometric projection-based transmitter switching policy is proposed for a communication system with multiple energy harvesting transmitters and one receiver, which can redu...

Wireless networks are founded on the principles of collision avoidance. This paper makes an attempt to detect and abort collisions in wireless networks. Briefly, the receiver uses physical layer information to detect collisions, and immediately notifies the transmitter to abort transmission. The collision notification consists of a unique signature, sent on the same frequency channel as the dat...