The invention of turbo codes and low density parity check (LDPC) codes has made it possible for us for design error correcting codes with low decoding complexity and rates close to channel capacity. However, such codes have been studied in detail only for the most basic communication system, in which a single transmitter sends data to a single receiver over a channel whose statistics are known ...

Energy harvesting is a promising technology to overcome the energy bottleneck in batterypowered heterogeneous sensor networks (HSNs). In an energy harvesting HSN, heterogeneous sensor nodes harvest energy to power themselves, and use the harvested energy for data transmission. This paper investigates a multiple-input single-output wireless powered HSN with imperfect channel state information (C...

CDMA (Code Division Multiple Access) plays an important role in modern wireless communications. MIMO refers to links with multiple antennas at the transmitter and receiver side. CDMA systems combined with multiple antennas is a promising technique, beyond 3G and 4G wireless communications. MIMO provides spatial diversity, which mitigates the fading. The usage of multiple antennas can significan...

In this paper we present a deeper view on the methods and the application considered in wireless Optical Code Division Multiple Access (OCDMA) systems. The high cost of reconfiguring and maintaining in wired networks makes wireless an economical and flexible alternative to wired system. The advantages of using infrared medium in LAN are noted. Properties of the wireless links are analyzed. Sinc...

An adaptive approach is used to adjust the transmit power of each beam in a line strip multi-beam optical transmitter based on information about the quality of the received signal due to each spot. The system assumes a feedback link between the optical transceivers. Diversity detection is employed to combat the degrading effect of the background noise in the channel with a 7detectors angle dive...

Recent work has focused on hiding explicit network identifiers such as hardware addresses from the link layer to enable anonymous communications in wireless LANs. These protocols encrypt entire wireless packets, thereby providing unlinkability. However, we find that these protocols neglect to hide identifying information that is preserved within the wireless physical layer. We propose a techniq...

In this paper, we address the problem of energy efficient packet scheduling in a wireless environment. We consider a wireless transmitter which is limited by its finite battery resource. Our objective is to design a transmission schedule that maximizes battery lifetime subject to some delay constraints. To achieve this, we exploit two previously unconnected ideas: (i) Channel coding can be used...

This paper presents the modeling, design and verification of a three-phase coil structure for high-power Wireless-Power-Transfer (WPT) in automotive applications. The system, Three-Polar-Pad (TPP), with complex mechanical geometry, is analytically modeled an equivalent simplified structure. Thanks to this simplification, numerical performed minimize cross-coupling effects among different phases...

For wireless transmission, the assumption that the transmitter always obtains the channel state information (CSI) is unreasonable because of feedback delays, estimation error and quantization error. When the transmitter can’t receive the CSI perfectly, some prescribed quality of service (QoS) requirements may not be satisfied. The performance of the wireless systems will degrade. In order to av...

Ultra-wideband radio (UWB) is a rapidly developing wireless technology that promises unprecedented data rates for short-range commercial radios, combined with precise locationing and high energy efficiency. These benefits stem from the use of wide bandwidths and impulse signaling, implying high channel capacity and precise time resolution. UWB has been used for military radar and imaging since ...