Wireless receivers process signals that bear information as well as disturbances caused by the transmitter/receiver circuits and channel impairments such as fad:ing, interference, and additive white gaussian noise (AWGN). Usually, the receiver knows only some statistical properties of the signal and disturbances. From these statistical properties and using a finite observation of the received s...

in exploration seismology, migration refers to a multi-channel processing step that attempts to spatially re-position events and improve focusing. before migration, seismic data is usually displayed with traces plotted at the surface location of the receivers and with a vertical time axis. this means that dipping reflections are systematically mispositioned in the lateral coordinate and the ver...

The demand for seamless mobile connectivity and wireless internet access across the globe has been increasing. OFDM has been shown to be very efficient in wireless and wire line communication over broadband channels. Frequency offset is mismatch between transmitter frequency and receiver frequency. Frequency offset is produced by unstable receiver clock generator or Doppler Effect. OFDM systems...

We propose a method to track a periodic RF transmitter using a mobile receiver. By estimating the difference in time-of-arrival (TOA) of the periodic messages at different locations along its trajectory, the receiver is able to estimate the transmitter location. A major challenge lies in separating the time offset due to receiver movement from the time offset due to local oscillator (LO) drift....

In this chapter, a novel receiver for Hexagonal Multicarrier Transmission (HMT) system based on the maximizing Signal-to-Interference-plus-Noise Ratio (Max-SINR) criterion is proposed. Theoretical analyses show that there is a timing offset between the prototype pulses of the proposed Max-SINR receiver and the traditional projection receiver. Meanwhile, the timing offset should be matched to th...

This paper mainly analyzes the effect of frequency offset on the performance of OFDM communications systems. The most important requirement in an OFDM is frequency and time synchronization as this form the reason for orthogonality between the subcarriers. However a major problem in OFDM is its vulnerability to frequency offset errors between the transmitted and received signals, which may be ca...

Multi-offset, single-hole, borehole-radar reflection surveys were conducted at the U.S. Geological Survey Fractured Rock Research Site at Mirror Lake, in Grafton County, New Hampshire. The study was conducted to evaluate the benefits of applying multi-offset seismic processing techniques to borehole-radar reflection surveys in fractured rock. The multi-offset reflection surveys were conducted i...

In this Master of Science thesis a simulation model of the HiperLAN/2 physical layer is designed and implemented. The model should provide insight in the demodulation functions that are necessary in HiperLAN/2 and it should be useful for determining channel selection and computational requirements for the software defined radio project at the University of Twente. The model is implemented in Ma...