Omar M. Abdul-Latif

TDOA/AOA Data Fusion for Enhancing Positioning in an Ultra Wideband System

This paper considers a new location scheme for ultra wideband (UWB) positioning system. The newly adopted scheme combines the time difference of arrival (TDOA) and the angle of arrival (AOA) positioning techniques in order to enhance the accuracy of the positioning system compared to the classical technique (TDOA). The new technique is simulated in a sports tracking application in a football field. Results are compared with results from a similar system using classical TDOA technique in order to establish a proof-of-concept. Simulation shows that the new technique is actually giving better performance with an acceptably longer processing time. This technique has the promise of boosting positioning accuracy with a relatively low level of complexity.

LS-SVM detector for RMSGC diversity in SIMO channels

Support vector machine (SVM) is a statistical learning tool developed to a more complex concept of structural risk minimization. SVM is playing an increasing role in applications to detection problems in statistical signal processing and communication systems. In this paper, SVM is applied to the detection of root-mean-square-gain combining (RMSGC) diversity signals in single-input-multiple-output (SIMO) systems, in the presence of channel noise characterized as partially developed Rician multipath fading and interference noise generalized as additive color Gaussian noise (ACGN). The structure and performance of SVM in terms of the bit error rate (BER) metric is analysed for these advanced stochastic noise models. The performance of SVM is then compared to conventional SIMO signaling with optimal model-based detection. We show that the SVM performance is superior to that of the maximum likelihood detector for all the selected pre-detection diversity gain combining schemes.

Improved GPR image focussing with repetitive normalised Superimposition techniques

The Superimposition technique offers an alternative to Fast Fourier Transform (FFT) and Inverse FFT calculations. side lobe levels are reduced with little or no increase in main lobe width, as opposed to standard windowing techniques where side lobe level reduction produces an increase in main lobe width with a resulting loss in resolution. The new technique uses repetitive superimpositions showing improvements over spatially variant apodization (SVA) techniques. A new normalisation scheme enhances side lobe reduction even further with no increase in main lobe width indeed it can reduce the main lobe width. The technique is seen to be more resilient to noise when appropriate multiple evaluations are chosen. The technique produces responses from reflections in GPR data that are resolved to responses much closer to a delta function than FFT/IFFT or SVA evaluations. When used in focussing algorithms the traditional hyperbolic characteristics of a B-scan are focussed into responses whose width in depth and plan position that are slightly better than half a wavelength of the bandwidth used. This is seen in theoretical data and in both data measured by commercial GPRs and in experimental data from a step frequency continuous wave based GPR. Theoretically the technique produces a strong indication of the permittivity of the ground the GPR measures are taken over, while in measured data the identification of the permittivity of the ground is less clear.

Performance of UWB system in a partially developed fading channel with CCI

Ultra Wideband technology (UWB) is an emerging technology that has proven to be quite suitable for short range applications. This paper is part of an ongoing research for using UWB technology for positioning team-sport players on a playground, Simulation is conducted for a number of “players” who are carrying RFIDs transmitting signals with biométrie information data about each player to a number of receiving antennas positioned around the field We investigate the effect of multiple access interference (MAI) on the performance of UWB wireless systems using a novel partially developed fading channel and a novel SIMO diversity combining scheme The main goal is to determine the number of interferers that the system can handle before producing an unacceptable Quality of Service (QoS). The results showed that, due to UWB low power spectral density characteristics, the system can handle a relatively large number of interferers.

FPGA Implementation of a Novel Receiver Diversity Combining Technique for Wireless SIMO Systems

In this paper, we study FPGA implementation of a novel receiver diversity combining technique, RMSGC for wireless transmission over fading channels in SIMO systems. Prior published results using ML-detected RMSGC diversity signal driven by BPSK showed superior bit error rate performance to classical diversity combining schemes. RMSGC was shown to be near-optimal in the sense that it was very close to that of the theoretically optimal MRC. Since MRC requires estimation of the channel coefficients, it is complicated and expensive, and it is not practical for non-coherent modulation and differentially coherent modulation. RMSGC, on the other hand, is a more attractive and simpler scheme since it does not require knowledge of the channel information states. The main drawback of RMSGC is that it is a non-linear technique, thus successful FPGA implementation of it using pipeline techniques is needed as a wireless communication test-bed for practical real-life situations. Simulation results showed that the hardware implementation was efficient both in terms of speed and area.

Transmission-power vs. BER in UWB wireless telecommunication system

Ultra Wideband technology (UWB) is an emerging technology that has proven to be quite suitable for short range applications. This paper is part of an ongoing research for using UWB technology for positioning team-sport players on a playing area, Simulation is conducted for a number of “players” who are carrying RFIDs transmitting signals with biométrie information data about each player to a number of receiving antennas positioned around the field We investigate the performance of UWB wireless systems using a novel partially developed fading channel and a novel SIMO diversity combining scheme with respect to the transmission range of the UWB devices. The main goal is to determine the required transmission power in order to get an acceptable QoS over the covered area in which the players are being tracked The results showed that, UWB system is an excellent choice for such short-range applications.

Performance of UWB telecommunication system in the presence of multiple access interference

Ultra wideband technology (UWB) is an emerging technology that has proven to be quite suitable for short range applications. This paper is part of an ongoing research for using UWB technology for positioning and remote sensing biometric information for team-sport players on a pitch, Simulation is conducted for a number of ldquoplayersrdquo who are carrying RFIDs transmitting signals with biometric information data about each player to a number of receiving antennas positioned around the field. We investigate the effect of multiple access interference (MAI) on the performance of UWB wireless systems using a novel MISO diversity combining scheme. The main goal is to determine the number of interferers that the system can handle before producing an unacceptable quality of service (QoS). The results show that, due to UWB low power spectral density characteristics, the system can handle a relatively large number of interferers.