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This paper investigates the processing of delay and Doppler information with IEEE 802.11p OFDM signaling for multi-target detection. We study the feasibility of extending IEEE 802.11p short-range communication (DSRC) in vehicles to automotive radio detection and ranging (radar) functionality. By exploiting the unique structure of 802.11p OFDM packets over multiple subcarriers and multiple time-slots,...
In this paper, we analyze Mean Square Error performances of the frequency offset estimator based on the Moose algorithm. From the analytical result, we indicate a possibility of the iteratively offset estimator and propose a modified estimator structure. By computer simulations, we evaluate the proposed iterative offset estimator and a compatibility with the theoretical analysis.
In this paper, we address the problems of frequency and timing synchronization for OFDM/OQAM systems in additive white Gaussian noise (AWGN) channel. A two step preamble based approach for carrier frequency offset (CFO) and timing offset (TO) estimation is proposed. The first step is joint coarse CFO and TO estimation and the second step is fine CFO (FCFO) estimation. We derive the Cramer-Rao lower...
In this paper a preamble aided integer frequency synchronization scheme for OFDM system is proposed. Here the estimation of the integer part of the carrier frequency offset (CFO) is addressed. This algorithm is operated in the frequency domain. The proposed algorithm estimate the integer frequency offset (IFO) by utilizing a matched filter. The performance of the proposed method is investigated by...
In many combat and civilian applications there is a need to detect and estimate parameters of multiple targets. In this paper, an algorithm to detect multiple targets in OFDM-RADAR environment is proposed. The detection is carried out by utilizing the fact that the problem of detecting targets in OFDM-RADAR environment is similar to that of the problem of detecting spectral components from the noisy...
In layered cellular networks, to avoid the frequent handovers (HOs) that occur between small cells when a high velocity mobile terminal (MT) travels through these small cells in a short period of time, an inter-layer HO control policy that connects an MT traveling at a high velocity to the macro-cell layer and an MT traveling at a low velocity to the small-cell layer, is effective. To realize such...
A novel orthogonal frequency division multiplexing (OFDM) multiple input multiple output (MIMO) radar concept for automotive applications is presented in this paper. Multiple transmit antennas are multiplexed via OFDM subcarrier interleaving. Such a multiplexing enables a simultaneous operation of transmit antennas utilizing the complete bandwidth. Whereas the known OFDM-MIMO radar concepts use an...
An orthogonal frequency division multiplexing (OFDM) multiple input multiple output (MIMO) radar at 24GHz is presented in this paper. Waveforms with bandwidth of 625MHz are generated digitally with an arbitrary waveform generator. A six channel RF front-end is used to construct a MIMO system with 2 transmit (Tx) and 4 receive (Rx) antennas. The received signal is sampled with a four-channel oscilloscope...
In an effort to augment existing bit-level network security mechanisms, a significant amount of research has been conducted in the area of physical layer device discrimination. One such physical layer device discrimination technique, known as RF-DNA fingerprinting, has successfully demonstrated serial number device discrimination. This work extends the RF-DNA fingerprinting state-of-the-art by investigating...
It is proposed that both digital and analog predistortion (DPD, APD) be used to cancel intermodulation distortion (IMD) in a dual band transmitter. DPD reduces IMDs near the carrier frequencies whereas APD cancels IMDs located at multiples of the carrier frequency separation. It is shown that linearization using memoryless basis waveforms provides cancellation of the dominant IMD modes when the two...
In this paper, a wide-range frequency offset tolerant OFDM for in-vehicle PLC system is presented. The carrier frequency and a new short frame OFDM suitable for low latency sensor network are discussed by analyzing the noise immunity, electrical emission characteristics and the channel property. We propose a new lookup table based estimation method of carrier frequency offset (CFO) and sampling frequency...
The demand for high speed, reliable communication using available frequency spectrum results in a new technology called OFDM. Channel estimation has a vital role in finding the effect of the channel on OFDM signal. In this work, performance analysis and implementation of pilot aided channel estimation is investigated. Different channel estimation methods like Least Square, Minimum mean Square Error...
The need for high data rate is growing since the multimedia applications are gaining popularity which needs high data rate and quality of service. Multiple Input Multiple Output (MIMO) transmission system is one of the most promising approach of the Smart Antenna Technology which uses multiple antennas in the transmitter and the receiver side and is currently followed for high-rate wireless communication[1]...
In this paper, an efficient approach is proposed to track the double-selected multipath channel for a Multiple-Input-Multiple-Output Orthogonal-Frequency-Division-Multiplexing (MIMO-OFDM) system in the existence of both Gaussian and non-Gaussian noises interfering with reference signals. Using nonlinear complex Multiple Support Vector Machine Regression (M-SVR) methodology, fast-fading multipath channel...
Orthogonal Frequency Division Multiplexing (OFDM) signals suffer from high PAPR (Peak to Average Power Ratio). Cyclic shifted sequences (CSS) was proposed as a solution to high PAPR. CSS reduces PAPR stochastically by giving some independent cyclic shifts to the time-domain signals of clusters. In CSS, however, we must transmit side information (SI) regarding the cyclic shift. Although a blind method...
One of the most promising ways of bringing localization services to GPS denied areas is the use of wireless sensor networks. For time difference of arrival (TDOA) systems, the achievable accuracy highly depends on the synchronization accuracy between the sensor nodes. In this paper we describe a new algorithm that achieves an ultra-precise wireless frequency synchronization using OFDM signals. Especially...
MIMO-OFDM is commonly used for communication system because it provides high data rates and fading effect which is introduced by multipath propagation; the system is robust against it. In MIMO-OFDM, channel estimation is a crucial technique for the estimation of the transmitted signal bits upon the received signal bits. Designing pilot pattern is an important step to realize PSA-OFDM. For channel...
In this paper we assess the performance of Support Vector Machine Regression (SVR) based on Radial Basis Function (RBF) and Artificial Neural Network (ANN) based on Scaled Conjugate Gradient Backpropagation (SCG) algorithms to estimate the channel variations using the reference signal structure standardized for LTE Downlink system. Complex SVR and ANN where applied to estimate real channel environment...
With the popularization of driving-assistance and self-driving systems, the mutual interference will become a big challenge for automotive radars, which demands the introduction of spectrum sharing technology. Based on the radar ranging using OFDM signals and target tracking, the overall performance of ranging accuracy is considered to be the criterion of spectrum allocation. Aiming to optimally allocate...
Now-a-days, secure communication is a significant characteristic that should be proficient to accommodate increasing demand of wireless communication. The fundamental principle of secure communication is the extraction of secret key and keeping this secret. In this paper, we propose innovative approach for secret key extraction and reconciliation. We exploit channel reciprocity through relative calibration...
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