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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...
Recent growth in traffic and the resulting congestion and accidents has increased the demand for vehicle positioning systems. Existing global navigation satellite systems were designed for line of sight environments and thus accurately determining the location of a vehicle in urban areas with tall buildings or regions with dense foliage is difficult. Fifth generation (5G) cellular networks provide...
This paper presents a ranging approach using an improved preamble sequence of orthogonal frequency-division multiplexing (OFDM) signal for 60 GHz system. The performance of range estimation with OFDM modulation under 60GHz channel is analyzed emphatically. In order to utilize the time-frequency characteristics of OFDM signal in the ranging system, the subcarriers phase difference algorithm with an...
A 60 GHz ranging model is established and a strongest path search ranging algorithm based on beamforming is proposed. The range error caused by a non-line of sight (NLOS) channel is mitigated by modeling the corresponding delay bias. Outlier detection is employed to improve the accuracy. Performance results are presented which show that 60 GHz ranging can achieve centimeter level accuracy in indoor...
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...
An all-MOSFET low-power low-dropout regulator is designed in CMOS technology, featuring low sensitivity with respect to input voltage and temperature. Supply voltage can be as low as 800mV. An error amplify (EA) with an embedded voltage reference (EVR) is employed and a buffer is used to improve the load transient. The circuit is simulated in 0.18 µm CMOS technology. Simulated results verify that...
The interference to a receiver of a second generation Beidou satellite system from ultra-wide band (UWB) impulse radio (IR) systems is analyzed. Both the power spectral density (PSD) of the Beidou satellite signal and the PSD of typical UWB-IR signals, such as UWB radar and pulse amplitude modulation (PAM) data signals, are given. The radio frequency (RF) front-end of the Beidou receiver is considered...
The paper presents a Time Of Arrival (TOA) location algorithm for Ultra-Wideband (UWB) wireless communication based on Back Propagation (BP) neural network (NN). The following six modules are employed to simulate the locating under Additive White Gaussian Noise (AWGN) channel model: generating samples for training with PPM-TH-UWB signal, training the BP neural network, generating another samples for...
In this paper, we determine the channel capacity of 60 GHz wireless communications over additive white Gaussian noise channels. The channel capacity with phase shift keying (PSK) is investigated under FCC power constraints for the unlicensed 59- 64 GHz radio spectrum. It is shown that the capacity of 60 GHz wireless communications is a function of distance and signal to noise (SNR) ratio, which demonstrates...
We investigate a practical approach to solving one instantiation of a distributed hypothesis testing problem under severe rate constraints that shows up in a wide variety of applications such as camera calibration, biometric authentication and video hashing: given two distributed continuous-valued random sources, determine if they satisfy a certain Euclidean distance criterion. We show a way to convert...
Information security risk assessment combined with power control process is an issue which has not properly solved yet. As substation automation system (SAS) functions as the key link of between implementation of control instructions and the collection of operation information, research on the application of information assets identification method in SAS under network environment, is an important...
A modeling method of motion-function is presented to represent the motion in detection of video images within the physical and motional characters of body. It concentrates on the characters of video surveillance, with the examples of walking videos, and results in walking functions by extracting and dealing with the data from the experiments. On this basis, more experiments are required to validate...
Inferring the 3D spatial layout from a single 2D image is a fundamental visual task. We formulate it as a grouping problem where edges are grouped into lines, quadrilaterals, and finally depth-ordered planes. We demonstrate that the 3D structure of planar objects in indoor scenes can be fast and accurately inferred without any learning or indexing.
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