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In this paper, two kinds of simplified cell structures for low voltage noise immunity and a hybrid Markov Random Field probabilistic-based circuit design technique are proposed to reduce the hardware overhead and improve the noise immunity. To demonstrate the proposed technique, four kinds of test chips with an 8-bit carry lookahead adder (CLA) are fabricated in a 130nm CMOS technology. Measurement...
This article presents a Bayesian track-before-detect (TBD) method based on Gaussian message passing to detect and track a target in the low SNR scene. Removing the threshold brings great computation demanding to TBD methods. Because of the distributive law and computation consistency, message passing can reduce the calculation load efficiently. Also, as a probabilistic inference algorithm, message...
The ranging and positioning accuracy of an impulse radio (IR) 60 GHz system is investigated. The corresponding Cramér-Rao lower bound (CRLB) over an additive white Gaussian noise (AWGN) channel is analyzed. The signal parameters which may affect the accuracy are examined. Performance results over AWGN and indoor residential channels are presented. In particular, the indoor residential channel models...
An impulse radio (IR) 60 GHz positioning system is proposed to provide accurate positioning. Two typical IR signals for positioning systems, namely polarity codes and pulse position modulation (PPM), are considered. The ranging and positioning accuracy and reliable distance in residential environments are investigated. Both line-of-sight (LOS) and non-line-of-sight (NLOS) channels are examined. Simulation...
Indoor localization techniques can produce significant errors in non-line-of-sight (NLOS) channels. To mitigate this problem, a new approach to channel identification based on the ratio of the minimum slope and skewness of the output of an energy detector is presented. The IEEE 802.15.3c 60 GHz channel models are used to examine the performance of this technique. The simplicity of the proposed approach...
The performance of a maximum likelihood (ML) based modulation classifier is highly sensitive to whether the model matches the real situation. In this paper, the quadrature amplitude modulation (QAM) signals are concerned and a ML modulation classifier which is robust to frequence offset, phase jitter, amplitude fluctuation and time delay is proposed. A new model is proposed to represent constellation...
60GHz communication is a promising technology for future multimedia applications in WPANs with its capability of supporting Giga-bit transmission in a short range. However, 60GHz signal degrades significantly through obstacles. Therefore, collaborative transmission is preferred to solve the link blocking problem. Furthermore, the utilization of directional antenna, which aims to offset the severe...
A magnetic anomaly detection (MAD) method for simultaneous moving magnetic dipole target and scalar magnetometer is developed. It is an extension of the traditional approach for only either the target or the sensor is moving. A modified triplet of orthonormal basis functions (OBF) is introduced, and an optimizing choice of the characteristic time is discussed. Whitening filtering technique is applied...
Film bulk acoustic resonator (FBAR) mass sensor has been widely explored for detection of chemical and biological events. In this paper, an FBAR sensor bounded by hydrophobic Teflon film has been fabricated and tested. Experimental results in Hg2+ detection demonstrate that the Teflon film bordering around the sensor enhances signal of the sensor by at least an order of magnitude. The improved FBAR...
In this paper, we investigate the performance of Nth best relay selection networks with secrecy constraints where several eavesdroppers try to overhear the source message. In order to enhance the network security, a single jammer is introduced to jam the eavesdroppers. In addition, sub-optimal selection strategy is introduced to combat the malicious attempt of eavesdroppers. We derive the exact secrecy...
Classifying sparse signals with compressive measurements is different from the well-known sparse recovery, for its focus is minimizing the probability of false classification rather than error of recovery. This paper considered the way to decrease the probability of false classification for compressive classifier. It is proved rigorously that the probability of false classification could be reduced...
Ultra-wideband (UWB) is a promising wireless technology that has drawn widespread attention due to its many possible applications such as short range, low power communications. UWB systems typically operate in the frequency band between 3.1 and 10.6 GHz, so they are susceptible to interference from other systems, which can degrade performance. Thus, interference mitigation is an important problem...
In this paper, we study the base station cooperative mechanism in uplink of 3GPP LTE system. In cellular systems with tight frequency reuse, one base station receives signals not only from users in local cell but also from users in adjacent cell which act as co-channel interference. Successive interference cancellation is a popular strategy for based base stations cooperation. We proposed power allocation...
Heterogeneous networks (HetNets) can provide a significant performance leap while cross-tier interference will become serious in HetNets. This paper focuses on solutions to the enhanced inter-cell interference coordination (eICIC) through adaptive power control. Four observations are concluded through the analysis of a typical interference case. A novel power control scheme without additional signalling...
An important component of ad hoc network is transmitter power control, which contributes to minimize the interference, increase the wireless network capacity, and extend the battery life of active nodes in the wireless network. It ensures that these transmission at the minimum power level is necessary to achieve a specified quality of service (QoS) defined by the SINR (Signal to Interference Noise...
In this paper, we propose a new algorithm, TLS-FOCUSS, for sparse recovery for large underdetermined linear systems, based on total least square (TLS) method and FOCUSS(FOCal Underdetermined System Solver). The problem of sparse recovery when perturbations appear in both the measurements and the dictionary (sensing matrix) is considered. FOCUSS algorithm is extended with main idea of TLS to reduce...
Power control is of fundamental importance to operation of Ad Hoc networks for a number of reasons: throughput, network capacity, battery life; as well as delay can be significantly improved, and so on. It is given that a feedback control system model based on the signal to interference and noise ratio (SINR) of links in the network whose control input is related to the transmitted power. Variable...
The capacity of differential pulse-position modulation (DPPM) is considered in this paper. Since the formula of Shannon Capacity is effective only in the AWGN channel with continuous-valued inputs and outputs, while the channel employing M-ary DPPM modulation has discrete-valued inputs and continuous-valued outputs, we derive the modified formula which applies to calculate the capacity of a UWB system...
This paper calculates the channel capacity of 60 GHz wireless communication systems over indoor line-of-sight (LOS) and non-line-of-sight (NLOS) channels based on a 60 GHz link budget model. The SNR and therefore capacity varying according to the communication distance are researched. The simulation result shows that the channel capacity falls sharply as distance increasing, especially in NLOS channel...
Tracking-before-detection (TBD) is well suitable for radar detection and target tracking of low-observable objects because it makes full use of the raw sensor data without using the threshold and takes advantage of the gains of time integration. The main difficulty in the TBD is that the measurement is a highly nonlinear function of the target state and the associations of measurements are hard to...
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