scholarly journals Experimental Results of Novel DoA Estimation Algorithms for Compact Reconfigurable Antennas

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Henna Paaso ◽  
Aki Hakkarainen ◽  
Nikhil Gulati ◽  
Damiano Patron ◽  
Kapil R. Dandekar ◽  
...  
Keyword(s):  
Antenna Arrays ◽  
Wireless Systems ◽  
Doa Estimation ◽  
Reconfigurable Antennas ◽  
Line Of Sight ◽  
Next Generation ◽  
Estimation Algorithms ◽  
Left Handed ◽  
Potential Use ◽  
Good Agreement

Reconfigurable antenna systems have gained much attention for potential use in the next generation wireless systems. However, conventional direction-of-arrival (DoA) estimation algorithms for antenna arrays cannot be used directly in reconfigurable antennas due to different design of the antennas. In this paper, we present an adjacent pattern power ratio (APPR) algorithm for two-port composite right/left-handed (CRLH) reconfigurable leaky-wave antennas (LWAs). Additionally, we compare the performances of the APPR algorithm and LWA-based MUSIC algorithms. We study how the computational complexity and the performance of the algorithms depend on number of selected radiation patterns. In addition, we evaluate the performance of the APPR and MUSIC algorithms with numerical simulations as well as with real world indoor measurements having both line-of-sight and non-line-of-sight components. Our performance evaluations show that the DoA estimates are in a considerably good agreement with the real DoAs, especially with the APPR algorithm. In summary, the APPR and MUSIC algorithms for DoA estimation along with the planar and compact LWA layout can be a valuable solution to enhance the performance of the wireless communication in the next generation systems.

scholarly journals Capacity Bounds for Dense Massive MIMO in a Line-of-Sight Propagation Environment

2019 ◽  
Author(s):  
Felipe Augusto Pereira de Figueiredo ◽  
Claudio Ferreira Dias ◽  
Eduardo Rodrigues de Lima ◽  
Gustavo Fraidenraich
Keyword(s):  
Antenna Arrays ◽  
Massive Mimo ◽  
Large Scale ◽  
Wireless Systems ◽  
Singular Values ◽  
Line Of Sight ◽  
Sum Capacity ◽  
Line Of Sight Propagation ◽  
Massive Number ◽  
Analytical Expressions

<div>The use of large-scale antenna arrays grants considerable benefits in energy and spectral efficiency to wireless systems due to spatial resolution and array gain techniques. By assuming a dominant line-of-sight environment in a massive MIMO scenario, we derive analytical expressions for the sum-capacity.</div><div>%</div><div>Then, we show that convenient simplifications on the sum-capacity expressions are possible when working at low and high SNR regimes.</div><div>%</div><div>Furthermore, in the case of a high SNR regime, it is demonstrated that the Gamma PDF can approximate the PDF of the instantaneous channel sum-capacity as the number of BS antennas grows. A second important demonstration presented in this work is that a Gamma PDF can also be used to approximate the PDF of the summation of the channel's singular values as the number of devices increases. Finally, it is important to highlight that the presented framework is useful for a massive number of Internet of Things devices as we show that the transmit power of each device can be made inversely proportional to the number of BS antennas.</div>

scholarly journals Capacity Bounds for Dense Massive MIMO in a Line-of-Sight Propagation Environment

2019 ◽  
Author(s):  
Felipe Augusto Pereira de Figueiredo ◽  
Claudio Ferreira Dias ◽  
Eduardo Rodrigues de Lima ◽  
Gustavo Fraidenraich
Keyword(s):  
Antenna Arrays ◽  
Massive Mimo ◽  
Large Scale ◽  
Wireless Systems ◽  
Singular Values ◽  
Line Of Sight ◽  
Sum Capacity ◽  
Line Of Sight Propagation ◽  
Massive Number ◽  
Analytical Expressions

<div>The use of large-scale antenna arrays grants considerable benefits in energy and spectral efficiency to wireless systems due to spatial resolution and array gain techniques. By assuming a dominant line-of-sight environment in a massive MIMO scenario, we derive analytical expressions for the sum-capacity.</div><div>%</div><div>Then, we show that convenient simplifications on the sum-capacity expressions are possible when working at low and high SNR regimes.</div><div>%</div><div>Furthermore, in the case of a high SNR regime, it is demonstrated that the Gamma PDF can approximate the PDF of the instantaneous channel sum-capacity as the number of BS antennas grows. A second important demonstration presented in this work is that a Gamma PDF can also be used to approximate the PDF of the summation of the channel's singular values as the number of devices increases. Finally, it is important to highlight that the presented framework is useful for a massive number of Internet of Things devices as we show that the transmit power of each device can be made inversely proportional to the number of BS antennas.</div>

On Massive MIMO for Low Power Wide Area Networks

2019 ◽  
Author(s):  
Felipe Augusto Pereira de Figueiredo ◽  
Claudio Ferreira Dias ◽  
ingrid moerman ◽  
Eduardo Rodrigues de Lima ◽  
Gustavo Fraidenraich
Keyword(s):  
Antenna Arrays ◽  
Massive Mimo ◽  
Large Scale ◽  
Wireless Systems ◽  
Singular Values ◽  
Wide Area Networks ◽  
Line Of Sight ◽  
Sum Capacity ◽  
Analytical Expressions ◽  
Array Gain

The use of large-scale antenna arrays grants considerable benefits in energy and spectral efficiency to wireless systems due to spatial resolution and array gain techniques. By assuming a dominant line-of-sight environment in a massive MIMO scenario with favorable propagation, we derive analytical expressions for the sum-capacity. % Then, we show that convenient simplifications on the sum-capacity expressions are possible when working at low and high SNR regimes. % Furthermore, in the case of a high SNR regime, it is demonstrated that the Gamma PDF can approximate the PDF of the instantaneous channel sum-capacity as the number of BS antennas grows. A second important demonstration presented in this work is that a Gamma PDF can also be used to approximate the PDF of the summation of the channel's singular values as the number of devices increases. Finally, it is important to highlight that the presented framework is useful for LPWAN's as we show that the transmit power of each device can be made inversely proportional to the number of BS antennas.

Direction of Arrival Estimation Under Near-Field Interference Using Matrix Filter

2015 ◽  
Vol 23 (04) ◽  
pp. 1540007 ◽  
Author(s):  
Guolong Liang ◽  
Wenbin Zhao ◽  
Zhan Fan
Keyword(s):  
Near Field ◽  
Direction Of Arrival ◽  
Doa Estimation ◽  
Direction Of Arrival Estimation ◽  
Far Field ◽  
Data Simulation ◽  
Estimation Algorithms ◽  
Simulation Results

Direction of arrival (DOA) estimation is of great interest due to its wide applications in sonar, radar and many other areas. However, the near-field interference is always presented in the received data, which may result in degradation of DOA estimation. An approach which can suppress the near-field interference and preserve the far-field signal desired by using a spatial matrix filter is proposed in this paper and some typical DOA estimation algorithms are adjusted to match the filtered data. Simulation results show that the approach can improve capability of DOA estimation under near-field inference efficiently.

A handoff management for Next Generation Wireless Systems

2010 ◽  
Author(s):  
Debabrata Sarddar ◽  
Joydeep Banerjee ◽  
Souvik Kumar Saha ◽  
M.K. Naskar ◽  
Tapas Jana ◽  
...  
Keyword(s):  
Wireless Systems ◽  
Next Generation ◽  
Handoff Management
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