scholarly journals Softer Handover Schemes for High Altitude Platform Station (HAPS) UMTS

2003 ◽  
pp. 123-130 ◽  
Author(s):  
Woo Lip Lim ◽  
Yu Chiann Foo ◽  
Rahim Tafazolli
Keyword(s):  
High Altitude ◽  
High Altitude Platform ◽  
High Altitude Platform Station

scholarly journals Time-Varying Communication Channel High Altitude Platform Station Link Budget and Channel Modeling

Information ◽  
2018 ◽  
Vol 9 (9) ◽  
pp. 210
Author(s):  
Xiaoyang Liu ◽  
Hengyang Liu ◽  
Chao Liu ◽  
Ya Luo
Keyword(s):  
High Altitude ◽  
Channel Model ◽  
Channel Modeling ◽  
Link Quality ◽  
Communication Link ◽  
Noise Power ◽  
Golay Code ◽  
High Altitude Platform ◽  
Link Budget ◽  
High Altitude Platform Station

Because of the high BER (Bit Error Rate), low time delay and low channel transmission efficiency of HAPS (High Altitude Platform Station) in the near space. The link budget of HAPS and channel model are proposed in this paper. According to the channel characteristic, the channel model is set up, combined with different CNR (Carrier Noise Ratio), elevation angle, coding situations of wireless communication link by using Hamming code, PSK (Pulse Shift Keying) and Golay code respectively, then the situations of link quality and BER are analyzed. The simulation results show that the established model of the link budget and channel are suitable for the theoretical analysis results. The elevation of the HAPS communication link is smaller while the BER is increasing. The case of channel in the coding is better than in the un-coded situation. When every bit power and thermal noise power spectral density is larger, the BER of the HAPS communication link is becoming smaller.

Other-cell interference and reverse link capacity of high altitude platform station CDMA system

2000 ◽  
Vol 36 (22) ◽  
pp. 1881 ◽  
Author(s):  
Y.C. Foo ◽  
W.L. Lim ◽  
R. Tafazolli ◽  
L. Barclay
Keyword(s):  
High Altitude ◽  
Cdma System ◽  
Reverse Link ◽  
Link Capacity ◽  
High Altitude Platform ◽  
High Altitude Platform Station

Effect of Rotation of a High Altitude Platform on Handover

2014 ◽  
Vol 926-930 ◽  
pp. 1922-1926
Author(s):  
Jing Ya Jiang ◽  
Dao Xing Guo
Keyword(s):  
Computer Simulation ◽  
High Altitude ◽  
Rotation Angle ◽  
Third Generation ◽  
Relative Movement ◽  
Rotation Direction ◽  
Critical Rotation ◽  
High Altitude Platform ◽  
Wireless Mobile ◽  
High Altitude Platform Station

High altitude platform station (HAPs) system is a novel and promising communication infrastructure, providing various wireless mobile services in Third Generation (3G) even Forth Generation (4G) communication. Because of the wind, variation of temperature and some other complexity conditions in the layer of stratosphere, HAPs might inevitably encounter relative movement to the ground. In this paper, two rotation models rotate around z-axis and x or y-axis respectively are constructed to illustrate the effects on handover. Computer simulation shows that the average possibility of handover is definitely determined by the rotation direction, cell’s position and rotation angle; the critical rotation angle of handover is also calculated when the cell’s position and the altitude of platform are fixed.

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