Experimental Performance of 2×2 Alamouti Space-Time Coding Non-line-of-sight Ultraviolet Communication System

2017 ◽  
Author(s):  
Risheng Cong ◽  
Yong Zuo ◽  
Feiyu Li ◽  
Lingchao Meng ◽  
Heng Qin ◽  
...  
Keyword(s):  
Communication System ◽  
Space Time ◽  
Line Of Sight ◽  
Experimental Performance ◽  
Space Time Coding ◽  
Time Coding ◽  
Ultraviolet Communication ◽  
Non Line Of Sight

scholarly journals Indoor Off-Body Wireless Communication: Static Beamforming versus Space-Time Coding

2012 ◽  
Vol 2012 ◽  
pp. 1-13 ◽  
Author(s):  
Patrick Van Torre ◽  
Maria Lucia Scarpello ◽  
Luigi Vallozzi ◽  
Hendrik Rogier ◽  
Marc Moeneclaey ◽  
...  
Keyword(s):  
Antenna Array ◽  
Base Station ◽  
Space Time ◽  
Error Rates ◽  
Line Of Sight ◽  
Receiver Diversity ◽  
Space Time Coding ◽  
Maximum Ratio Combining ◽  
Line Of Sight Propagation ◽  
Time Coding

The performance of beamforming versus space-time coding using a body-worn textile antenna array is experimentally evaluated for an indoor environment, where a walking rescue worker transmits data in the 2.45 GHz ISM band, relying on a vertical textile four-antenna array integrated into his garment. The two transmission scenarios considered are static beamforming at low-elevation angles and space-time code based transmit diversity. Signals are received by a base station equipped with a horizontal array of four dipole antennas providing spatial receive diversity through maximum-ratio combining. Signal-to-noise ratios, bit error rate characteristics, and signal correlation properties are assessed for both off-body transmission scenarios. Without receiver diversity, the performance of space-time coding is generally better. In case of fourth-order receiver diversity, beamforming is superior in line-of-sight conditions. For non-line-of-sight propagation, the space-time codes perform better as soon as bit error rates are low enough for a reliable data link.

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