Minimum mean squared error design of single-antenna two-way distributed relays based on full or partial channel state information

2011 ◽  
Vol 5 (5) ◽  
pp. 728-735 ◽  
Author(s):  
C. Li ◽  
W.-P. Zhu ◽  
L. Yang
Keyword(s):  
Channel State Information ◽  
Mean Squared Error ◽  
Channel State ◽  
State Information ◽  
Single Antenna ◽  
Minimum Mean Squared Error ◽  
Squared Error ◽  
Partial Channel

scholarly journals Exploiting Array Pattern Synthesis for Physical Layer Security in Millimeter Wave Channels

Electronics ◽  
2019 ◽  
Vol 8 (7) ◽  
pp. 745 ◽  
Author(s):  
Jong-Ho Lee ◽  
Jeongsik Choi ◽  
Woong-Hee Lee ◽  
Jiho Song
Keyword(s):  
Millimeter Wave ◽  
Channel State Information ◽  
Physical Layer Security ◽  
Physical Layer ◽  
Channel State ◽  
Pattern Synthesis ◽  
State Information ◽  
Array Pattern ◽  
Beamformer Design ◽  
Partial Channel

In this paper, we propose a beamformer design scheme for wireless physical layer security using partial channel state information (CSI) in millimeter wave channels. The partial CSI used in this work is the range of angle-of-departure (AOD). Assuming that the AOD range of each node is available, we design a transmit beamformer using semidefinite programming based on array pattern synthesis. Numerical results are presented to verify the secrecy rates achieved by the proposed scheme.

scholarly journals Radiation Angle Estimation and High-Precision Pedestrian Positioning by Tracking Change of Channel State Information

Sensors ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 1430
Author(s):  
Wataru Komamiya ◽  
Suhua Tang ◽  
Sadao Obana
Keyword(s):  
Channel State Information ◽  
Signal Transmission ◽  
Three Dimensional ◽  
Channel State ◽  
Angle Estimation ◽  
State Information ◽  
Communication Signals ◽  
Vehicle Communication ◽  
Single Antenna ◽  
Radiation Angle

P2V (pedestrian-to-vehicle) communication, in which a pedestrian’s mobile device notifies its position to nearby vehicles in order to prevent pedestrian accidents, has attracted much research interest recently, but its performance largely depends on the precision of pedestrians’ positioning. Pedestrian positioning is generally performed by using GPS (Global Positioning System), and its precision may greatly degrade in urban canyons. To improve positioning precision of pedestrians, it was proposed that vehicles around pedestrians be used as anchors beside satellites. In this method, a pedestrian device overhears V2V (vehicle-to-vehicle) communication signals which carry the vehicle position and calculates a pedestrian’s position using pedestrian–vehicle distance/angle information estimated from CSI (channel state information) of the V2V signals. However, angle estimation typically depends on the number of antennas of the pedestrian device. In this paper, we propose a new method to estimate signal radiation angle by tracking temporal change of CSI caused by vehicle movement during signal transmission and investigate its application to precise pedestrian positioning. Three-dimensional ray tracing simulations confirm that compared to the base method using eight antennas, the proposed method with a single antenna reduces average angle error from 13 degrees to 3.9 degrees, and reduces average positioning error from 2.49 m to 0.78 m.

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