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In this paper, we present a multistage group-decision-aid MUD (MG-MUD) for the uplink multirate code division multiple access (CDMA) systems. To provide good tradeoff between the performance and computational complexity, the new MUD is based on the widely MMSE criterion and constructed by a bank of group detectors in each stage. First, the users are classified into different groups according to their...
In synchronous DS-CDMA systems, multi-access interference (MAI) due to severe frequency-selective fading degrades the system performance. Based on the frequency domain oversampling (FDO) and minimum mean-square error (MMSE) principle, a novel linear per-user MMSE detector is proposed to approximately restore the orthogonality among the spreading sequences and suppress the MAI. Based on a discussion...
In this paper, the combined normalized and offset min-sum algorithm is proposed for efficient decoding of low-density parity-check (LDPC) codes in optical and magnetic storage systems. The proposed algorithm can be considered as a general case of the normalized and offset algorithms, and offers better BER performance compared to them. The performance improvement is presented for a partial response...
Utilizing advanced technologies to guarantee safety protection for pedestrians at intersections has become an important issue because intersections are the places where pedestrians easily conflict with vehicles. The purpose of this study is to propose a conceptual design of an intersection bus-pedestrian collision warning system with appropriate detection and warning parameters for bus drivers approaching...
Early work has demonstrated that conserve self pattern recognition algorithm (CSPRA) produces promising performance in the field of anomaly detection. This paper further extends the applications of CSPRA to Fisher's Iris data, Indian Telugu data and Wisconsin breast cancer data. A formal description of the differences between the two detection strategies (classical CSPRA and selective CSPRA) is given...
This study investigates how frequency offsets of multitone jamming affect the fast frequency-hopped binary frequency shift keying (FFH/BFSK) product-combining receiver (PCR) under additive white Gaussian noise (AWGN). We demonstrate the average bit-error-rate (BER) expressions of the FFH/BFSK PCR and the average BER expressions of an FFH/BFSK spread-spectrum (SS) communication system with frequency...
In conventional cyclic prefix (CP) based multicarrier code-division multiple-access (MC-DMA) systems, the major problem is the multiple-access interference (MAI) caused by frequency-selective fading, near-far effect and frequency offset. In order to eliminate MAI, we propose a linear minimum mean-square error (MMSE) detector for zero-padded (ZP) MC-CDMA systems based on frequency-domain oversampling...
Detecting the point in time where a dynamic fitness landscape changes is vital for a considerable number of diversity management schemes that used in evolutionary algorithms employed for solving dynamic optimization problems. Here, we introduce a change detector based on principles of artificial immune systems, namely a negative selection algorithm. We show in numerical experiments that such an immunological...
This paper proposes a frontal staircase detection algorithm using both classical Haar-like features and a novel set of PCA-base Haar-like features. Real AdaBoost is used for training a cascaded classifier. The PCA-based Haar-like features are extremely efficient at rejecting background regions at early stages in the cascade. A specifically designed scanning scheme made the algorithm constantly time...
Error propagation from the relay to the destination is a major drawback of digital relaying protocols that substantially diminishes the cooperative diversity gain of the system. Appropriately designed selection relaying schemes can effectively mitigate this phenomenon and improve the diversity order, specifically when the source-relay channel state information (CSI) is not available at the destination...
Cognitive radio is an emerging technology in communication systems. Cognitive radios aim to relief the shortage of spectral resources by identifying and exploiting underutilized radio spectrum. A key task of the cognitive radio is spectrum sensing in order to find free spectrum and detect licensed spectrum user transmissions. In this paper, an FPGA implementation of a feature detector for OFDM-based...
A very simple, low power, wide range and high accuracy Phase Detector (PD) is presented solving many problems of the conventional circuits. SPICE simulation results show that the immune frequency range of operation is 1MHz to 2GHz. The dead zone of the presented open loop PD is zero, makes it the best choice to be used in high speed DLLs. This circuit is tested in 0.35um CMOS technology.
Face detection is a prerequisite step for face recognition and face analysis related applications. Aim of the face detection system is to identify and locate all faces regardless of their positions, scale, orientation, lighting conditions, expressions, etc. The faces which get detected under such conditions will affect the face recognition rate. Various approaches have been employed to detect faces...
This paper proposes a novel power supply transient current sensing based completion detector for single rail asynchronous systems to achieve high throughput compared to systems using speculative delay. This paper also proposes a new event separator logic for separating data tokens, in situations where the current sensor is idle due to consecutively same inputs. This type of logic is indispensable...
This paper presents a user-friendly interface in Matlab??, called BioSigBrowser, that aims to facilitate the use of algorithms in biomedical signal processing. It includes methods related with cardiovascular signal processing, namely some multimodal analysis. This platform can treat a single signal or work in a batch mode on a given database as is usual in research. Furthermore, its modular characteristic...
In this paper, a spectrum sensing approach based on stochastic resonance (SR) technique is proposed. According to the theorem of the improvability of detection via SR and the spectral power amplification (SPA) promotion of the SR system, the property of the primary users (PUs) in cognitive radio (CR) networks can be detected easier when the SR phenomenon is realized. Performance analyses and computer...
Magnetic recording systems employ conventional timing recovery to synchronize the sampler with the readback signal. However, conventional timing recovery does not perform well when the timing error is large. This paper proposes the bidirectional timing recovery, which utilizes conventional timing recovery to sample the readback signal both in forward direction and in backward direction. The outputs...
In this paper, we present two new filtered back-projection (FBP) type algorithms for cylindrical detector helical cone-beam geometry with no position dependent backprojection weight. The algorithms are extension of the recent exact Hilbert filtering based 2D divergent beam reconstruction with no back-projection weight to the FDK type algorithm for reconstruction in 3D helical trajectory cone-beam...
As the popularity of the active RFID technology continues to surge for its many advantages, its fatal flaw of power consumption is, however, an inherently limit of its application. To hurdle through the energy limitation, a low-power wake-up circuit for active RFID Tags is proposed in this paper. The circuit, performing as ASK demodulator, employs an OTA, a peak detector, a RC filter, a comparator,...
This work presents a new mechanism for securing mobile ad hoc domain. Some human immune features and properties have been motivated in an attempt to build a robust security system. New computational techniques have been developed based on the immune system concepts, seeking to solve several engineering problems; however, not all the previous approaches have a tangible contribution to the networking...
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