scholarly journals Joint TOA and DOA Estimation for UWB Systems with Antenna Array via Doubled Frequency Sample Points and Extended Number of Clusters

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Liangliang Gong ◽  
Yang Hu ◽  
Junyao Zhang ◽  
Gaofeng Zhao
Keyword(s):  
Antenna Array ◽  
Estimation Algorithm ◽  
Doa Estimation ◽  
Ultra Wideband ◽  
Time Of Arrival ◽  
Number Of Clusters ◽  
Nanosecond Pulses ◽  
Toa Estimation ◽  
Sample Points ◽  
To Receive

The ultra-wideband (UWB) system, which transmits information using nanosecond or even sub-nanosecond pulses, has been widely applied in precise positioning. In this paper, we investigate the problem of the time of arrival (TOA) estimation and the direction of arrival (DOA) estimation in the UWB systems with antenna array and propose a joint TOA and DOA estimation algorithm with doubled frequency sample points and extended number of clusters. Specifically, the proposed algorithm uses two antennas to receive impinging signals and utilizes the conjugate symmetry characteristic of the delay matrices to extend the sample points as well as the number of clusters. Moreover, in order to obtain TOA estimates with low computational complexity, the proposed algorithm transforms the two-dimensional (2D) spectral search to one-dimensional (1D) searches. The DOA estimates can then be achieved by using the TOA estimation results and the geometric information. Simulation results are given to testify the performance of the proposed algorithm.

scholarly journals Improved energy detection receiver for ranging in IEEE 802.15.4a standard

2017 ◽  
Vol 10 (2) ◽  
pp. 141-148
Author(s):  
Abdelmadjid Maali ◽  
Geneviève Baudoin ◽  
Ammar Mesloub
Keyword(s):  
Estimation Algorithm ◽  
Energy Detection ◽  
Ultra Wideband ◽  
Line Of Sight ◽  
Accurate Estimation ◽  
Time Of Arrival ◽  
Power Delay Profile ◽  
Wideband Signals ◽  
Toa Estimation ◽  
Ieee 802.15.4A

In this paper, we propose a novel energy detection (ED) receiver architecture combined with time-of-arrival (TOA) estimation algorithm, compliant to the IEEE 802.15.4a standard. The architecture is based on double overlapping integrators and a sliding correlator. It exploits a series of ternary preamble sequences with perfect autocorrelation property. This property ensures coding gain, which allows an accurate estimation of power delay profile (PDP). To improve TOA estimation, the interpolation of PDP samples is proposed and the architecture is validated by using an ultra-wideband signals measurements platform. These measurements are carried out in line-of-sight and non-line-of-sight multipath environments. The experimental results show that the ranging performances obtained by the proposed architecture are higher than those obtained by the conventional architecture based on a single-integrator in both LOS and NLOS environments.

Yet another TOA estimation technique for IR-UWB

2013 ◽  
Vol 33 (1/2) ◽  
pp. 286-297 ◽  
Author(s):  
Mustapha Djeddou ◽  
Hichem Zeher ◽  
Younes Nekachtali
Keyword(s):  
Channel Model ◽  
Distance Measure ◽  
Estimation Algorithm ◽  
False Alarm Probability ◽  
Ultra Wideband ◽  
Estimation Accuracy ◽  
Time Of Arrival ◽  
Content Type ◽  
Toa Estimation ◽  
Proportionality Test

Purpose – The paper aims to propose a new method for estimating the time of arrival (TOA) of ultra-wideband (UWB) signals under IEEE 802.15.4a multipath channel model. Design/methodology/approach – The proposed approach is based on a proportionality test and consists in finding out whether two autoregressive (AR) processes, modeling two frames, are proportional or not. The latter operation uses a distance to measure the proportionality between the two AR processes. Findings – The developed technique may be used in two ways, sample-by-sample or block-by-block, according to the required ranging accuracy. It is important to note that the method offers flexibility between the computational load and the needed estimation accuracy. Moreover, the proposed method uses a threshold that is derived analytically according to a preset false alarm probability. Practical implications – Simulation experiments are conducted to assess the performance of the new TOA estimation algorithm. Thereby, the comparison is done against the well-known CLEAN algorithm for a sample-by-sample based TOA estimation and against three energy detector based receiver algorithms. The obtained results highlight the effectiveness of the developed approach. Originality/value – The developed TOA estimation algorithm is completely different from other techniques in the literature, and it is based on a proportionality test between two sliding frames. These latter are modeled by two AR processes. Then a distance measure is used to check whether or not the power spectral densities are proportional.

scholarly journals Virtual Antenna Array and Fractional Fourier Transform-Based TOA Estimation for Wireless Positioning

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 638 ◽  
Author(s):  
Zhigang Chen ◽  
Lei Wang ◽  
Mengya Zhang
Keyword(s):  
Fourier Transform ◽  
Antenna Array ◽  
Space Dimension ◽  
Fractional Fourier Transform ◽  
Phase Variation ◽  
Quadratic Function ◽  
Estimation Methods ◽  
Energy Concentration ◽  
Time Of Arrival ◽  
Toa Estimation

In this paper, a novel virtual antenna array and fractional Fourier transform (FRFT)-based 2-dimension super-resolution time-of-arrival (TOA) estimation algorithm for OFDM WLAN systems has been proposed. The proposed algorithm employs channel frequency responses (CFRs) at the equi-spaced positions on a line or quasi-line moving trajectory, i.e., the CFRs of a virtual antenna array, to extract multipaths’ TOA information. Meanwhile, a new chirp-like quadratic function is used to approximate the channel multipaths’ phase variation across the space dimension, which is more reasonable than the traditional linear function, especially for relatively big virtual antenna array sizes. By exploiting the property of chirp-like multipaths’ energy concentration in the FRFT domain, the FRFT can be first used to separate chirp-like multipath components, then the existing TOA estimation methods in frequency domain can be further employed on the separated multipath components to obtain the multipaths’ TOA estimates. Therefore, the proposed algorithm can make more use of the multipaths’ characteristics in the space dimension, thus it can efficiently enhance the multipath resolution and achieve better multipaths’ TOA estimation performance without requiring a real antenna array. Simulation results demonstrate the effectiveness of the proposed algorithm.

A RBFNN approach for DoA estimation of ultra wideband antenna array

2008 ◽  
Vol 71 (4-6) ◽  
pp. 631-640 ◽  
Author(s):  
Min Wang ◽  
Shuyuan Yang ◽  
Shunjun Wu ◽  
Feng Luo
Keyword(s):  
Antenna Array ◽  
Doa Estimation ◽  
Ultra Wideband ◽  
Wideband Antenna

DOA Estimation Algorithm in Switch Antenna Array with a Single Cycle of Sampled Data

2011 ◽  
Vol 291-294 ◽  
pp. 3250-3254 ◽  
Author(s):  
Ke Zhang ◽  
Peng Ma ◽  
Jian Yun Zhang
Keyword(s):  
Antenna Array ◽  
Toeplitz Matrix ◽  
Estimation Algorithm ◽  
Doa Estimation ◽  
Eigenvalue Decomposition ◽  
The Novel ◽  
Sampled Data ◽  
Coherent Signals ◽  
Music Algorithm ◽  
Single Cycle

For DOA estimation of coherent signals in switch antenna array (SAA), a new fast algorithm is proposed. Instead of conventional sub-space algorithm’s covariance matrix, a Toeplitz matrix is constructed with a single cycle of sampled data. It is proved theoretically that the ranks of the Toeplitz matrix is equal to the number of signal sources and has no relations with the coherency of the signal source. Through eigenvalue decomposition, signal and noise subspace are obtained respectively, then DOA estimation can be done by one-dimensional spectral peak searching according to the MUSIC algorithm. The theoretical analysis and simulation results demonstrate validity and superiority of the novel algorithm.

Unitary Transformed DOA Estimation Algorithm Based on Modified Propagator Method

2013 ◽  
Vol 303-306 ◽  
pp. 2033-2037
Author(s):  
Guang Ya Huang ◽  
Xiao Fei Deng ◽  
Fan Bin Meng ◽  
Ping Yuan Liang
Keyword(s):  
Antenna Array ◽  
Estimation Algorithm ◽  
Doa Estimation ◽  
Propagator Method ◽  
Unitary Transform ◽  
Simulation Results

The modified propagator method(MPM) improves the performances of DOA estimation, but compared with the propagator method (PM), the computational loads increase, especially under large number of antenna array elements condition. This paper studies the principle of using unitary transform to rearrange the propagator, and proposes unitary transformed MPM(UMPM) in order to decrease the computational loads by real-valued computation. The simulation results show that the proposed algorithm can achieve superior precision and lower computational loads than PM, MUSIC and MPM.

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