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On behalf of all the members of the Organizing Committee, I would like to welcome you to the 4thInternational Conference on Signal Processing and Telecommunication Systems, ICSPCS'2010. The ICSPCS conferences evolved from the series of successful symposia and workshops, i.e. International Symposia on DSP and Communication Systems (DSPCS), and Workshops on the Internet, Telecommunications and Signal...
The following topics are dealt with: communication theory and techniques; DSP algorithms and hardware implementations; wireless networking; Internet and wireless systems.
We first provide an overview of the dynamic decode-and-forward (DDF) relaying protocol, which is a recently proposed technique for cooperative wireless communications. DDF is based on the idea that each relay in the system should listen to the transmission from other active nodes till it receives enough information to decode, and retransmit only then. It has been proven to outperform any amplify and...
IEEE 802.11s is an upcoming standard that defines how wireless devices can interconnect in a multi-hop configuration. While there are several protocol stacks based on the IEEE 802.11s draft standard, there has not been a formal study or comparison examining their practical performance. This paper evaluates the routing performance of open80211s in a real-world mesh testbed. The experiments benchmark...
The amplify-and-forward (AF) relay beamforming problems are naturally formulated as indefinite quadratic (nonconvex) optimization programs. The typical methods for solving such optimization problems are to transform them into convex semi-definite programs (SDPs) with additional rank-one (nonconvex and discontinuous) constraints. The rank-one constraints are then dropped to obtain solvable SDP relaxed...
As the sophistication and proliferation of digital media continues to increase, so to do methods which seek to compromise data integrity. Digital authentication can be a critical component to ensuring reliability and security in digital video surveillance platforms. A robust method of encoding video can provide authentication ensuring that data has not been compromised and is still reliable. By watermarking...
In this paper we propose two new methods of improving the robustness of Automatic Speaker Identification systems. These methods rely on using long-term information in the speech signal to improve the robustness of the features. The first method involves averaging filterbank parameters from consecutive short-time frames over a longer window. The second method investigates the use of frame lengths longer...
The most fundamental issue in the ranging for wireless positioning is to obtain clock synchronization between the two nodes and to correct an error caused by the relative clock offset from each node. An error is created when measuring the distance between the two nodes due to the clock offset as each of the two nodes uses different clocks independently. This paper suggests a ranging technique that...
In this work a reduced complexity chip-level linear SIC multiuser structure that is asymptotically equivalent to successive over-relaxation (SOR) iteration, which is known to outperform the conventional Gauss-Seidel iteration by an order of magnitude in terms of convergence speed, is proposed. The main advantage of the proposed scheme is its low computational complexity compared to other chip-level...
This contribution compares the predicted downlink throughput coverage of a WiMAX-like system - located in a rural environment - for different operating frequencies and transmit power levels. The throughput, which is simulated using the parameters of the IEEE 802.16e-2005 standard, is based on extensive received signal power level measurements carried out with a mobile radio scanner at the frequencies...
Fast and accurate distance measurement is crucial for target tracking and node localization in Wireless Sensor Networks. For short-range Underwater Acoustic Sensor Networks (UASNs), received signal strength (RSS) can give distance between acoustic devices. An extensive study on the application of the Lambert W function over RSS for distance estimation in short-range UASNs shows that it can be done...
The concept of an Ultra Wideband (UWB) Monopulse Microwave Radar System for detection and location of breast cancer is described. The system uses a two-element Tapered Slot Antenna (TSA) array accompanied by a UWB 180° hybrid which scans the breast. When the breast tissue features symmetry with respect to the array axis and the hybrid enables the 180° out phase feeding operation, the array automatically...
In this paper, a closed-form expression for Bit Error rate (BER) of a Multiple-Input Multiple-Output (MIMO) system employing the Minimum Mean Square Error MMSE channel estimation method is derived. The numerical results show that when the Channel State Information (CSI) is free of estimation errors BER decreases when the number of receive antennas increases. However under imperfect CSI, BER is getting...
The performance of a two hop amplify-and-forward relay system, where the source-relay and the relay-destination channels experience Rayleigh and Rician fading, respectively, is investigated with relay selection. Partial relay selection is considered, where the relay is selected based on instantaneous and partial knowledge of the channel (source-relay). We derive an exact expression for the outage...
This paper reports the performance of a downlink of a multiuser MIMO system which uses a successive beamforming broadcasting scheme. The investigations take into account the effects of mutual coupling that is present in receiving antennas. It is shown that that the mutual coupling changes the received signals statistic properties and impacts the co-channel interference component. The overall mutual...
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