In this paper, a novel anti-eavesdropping OFDM system through dynamic subcarrier coordinate interleaving is proposed by exploiting the reciprocal, location-dependent and time-varying nature of wireless channels. The transmitter performs coordinate interleaving at some of the OFDM subcarriers in an opportunistic manner, where the secret interleaving pattern is determined by the instantaneous cha...

Tomlinson-Harashima Precoding (THP) is a transmitter technique particularly suited for data transmission systems in which the channel equalization task is performed at the transmitter. In such systems, accurate receiver AGC is a key requirement to achieve low bit error rates. This issue is particularly challenging in packet-based (bursty) wireless communication systems using THP, where fast con...

IRELESS VANTAGE PRO2 Vantage Pro2TM (6152, 6153) and Vantage Pro2TM Plus (6162, 6163) Wireless Weather Stations include two components: the Integrated Sensor Suite (ISS) which houses and manages the external sensor array, and the console which provides the user interface, data display, and calculations. The ISS and Vantage Pro2 console communicate via an FCC-certified, license-free, spread-spec...

In this paper we present research results for wireless transmission systems with linear antenna arrays at the transmitter and the receiver (multiple input multiple output MIMO) in combination with orthogonal frequency division multiplexing (OFDM) in broadband channels. With these systems all three dimensions of wireless channels frequency, time and space can be addressed and various system desi...

Wireless links with multi-antenna transmitters and receivers can be used to provide increased diversity and/or large data-rates. It has been shown that multi-antenna communication systems can simultaneously achieve the maximum diversity and maximum rate (or multiplexing) gain. This paper proposes a modified version of traditional spatial multiplexing that allows the wireless system to obtain ma...

The multipath-rich wireless atmosphere allied with typical wireless usage scenarios is characterized by a vanishing channel retort that is time-varying, location-sensitive, and only shared by a given transmitter–receiver pair. The complexity allied with a highly scattering atmosphere implies that the short-term vanishing process is intrinsically hard to envisage and best modeled stochastically,...

Zero padding (ZP) of multicarrier transmissions has recently been proposed as an appealing alternative to the traditional cyclic prefix (CP) orthogonal frequency-division multiplexing (OFDM) to ensure symbol recovery regardless of the channel zero locations. In this paper, both systems are studied to delineate their relative merits in wireless systems where channel knowledge is not available at...

This paper presents the throughput comparison at the fully functional device and reduced functional devices of IEEE 802.15.4 with different modulation schemes for Wireless Sensor Networks (WSNs). From the simulations it is revealed that Minimum Shift Keying (MSK) is best suited for all types of devices in 802.15.4 for wireless sensor networks if throughput is to be maximized. Simulations also r...