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| An Embedded Multibeam Configuration
for CDMA Communication Systems on HAPS |
| Cheng Yue-bo①②; Jin Rong-hong①; Liu Bo①; Geng Jun-ping① |
①Department of Electronic Engineering, Shanghai Jiaotong University, Shanghai 200030, China;
②Dep. of Physics and Electronic Engineering, Normal College of Yantai, Yantai 264025, China |
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Abstract An improvement of the micro/macro beam configuration used in HAPS (High Altitude Platform System) CDMA systems is proposed, in which the model employed for the optimization of the system is complex but more practical, especially in the improvement of the array pattern and the calculation of channel interferences. The configuration is expected to satisfy the requirement of CDMA systems on HAPS, and the relief of traffic burden in hot spot areas can be achieved by embedding micro-beams in the macro-beams at the hot spot locations. The optimization is realized by the adjustment of the micro-beam for different user distributions and different hot spot locations. The numerical results show that the hot spot problem can be relieved efficiently with the presented structure, and a higher and more stable system capacity is expectable despite the variation of the user distribution.
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Received: 19 November 2004
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2006, Vol. 28 
