平流层艇载CDMA系统的嵌入式多波束天线方案

程月波; 金荣洪; 刘波; 耿军平

平流层艇载CDMA系统的嵌入式多波束天线方案

程月波^{①②;金荣洪},
金荣洪,
刘波,
耿军平

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出版历程
- 收稿日期: 2004-11-19
- 修回日期: 2005-05-08
- 刊出日期: 2006-08-19

An Embedded Multibeam Configuration for CDMA Communication Systems on HAPS

摘要

摘要: 该文改进了原先提出的微/宏波束天线覆盖方案，采用更为复杂但更贴近实际的模型，尤其是改进了艇载天线波束方向图和信道干扰的计算方法。该方案应用于平流层通信CDMA系统，通过在宏波束覆盖范围中嵌入微波束，解决平流层通信系统中由于用户分布失衡而引起的热点问题。针对不同的用户分布和热点位置，文中给出了调整微波束实现系统容量最大化的优化方法。仿真结果表明在用户分布失衡、热点位置变化等情况下使用本文的嵌入式波束覆盖方案仍然可以保持高而稳定的系统容量。
- CDMA系统;平流层通信;多波束天线;嵌入式波束;热点
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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参考文献(1)

Tong Z, Wu Y, Zhu H, Fu G, Jin R. Feasibility study of stratospheric platform and information systems in China, 2000 Stratospheric Platform System Workshop[C]. Tokyo, Japan, 2000: 60.68.[2]Niu Z.[J].Jin R, Liu S, Fu G, Wu Y, Tong Z. RD progress on stratospheric communication systems in China.2003,:-[3]ITU-R Doc. Recommendation ITU-RF.1569, Technical and operational characteristics for the fixed service using high altitude platform stations in the bands 27.528.35 GHz and 3131.3 GHz, ITU-R Doc. 9BL/25, May 2002.[4]Ryu Nitura, Masayuki Oodo, Yoshihiro Hase, Takayuki Inaba, Teijiro Sakamoto, Mikio Suzuki. Digital beamforming array antenna on-board stratospheric platform for quick response SDMA in the band 31/28 GHz, International Symposium onWireless Personal Multimedia Communications (WPMC'01)[C], Sep. 2001.[5]Cheng Yuebo, Jin Ronghong, Jiang Ran, Liu Bo. Hot spot relief with embedded beam for CDMA systems in HAPS, Journal of Electronics Information Technology, Journal of Electronics (China), 2006, 23(2): 172-175.[6]Joseph Shapira. Microcell engineering in CDMA cellular networks[J], IEEE Trans. on Vehicular Technology, 1994, 43(4): 817825.[7]Kim D H, Lee D D, Kim H J , Whang K C. Capacity analysis of macro/microcell CDMA with power ratio control and tiltedantenna[J]. IEEE Trans. on Vehicular Technology, 2000, 49(1): 3442.[8]Thornton J , Grace D. Optimizing an array of antennas for cellularcoverage from a high altitude platform[J]. IEEE Tran. on WirelessCommunications, 2003, 2(3): 484492.[9]Foo Y C, Lim W L, Tafazolli R, Barclay L. Other-cell interference and reverse link capacity of high altitude platform station CDMA system[J]. Electronics Letters, 2000, 36(22): 18811882.

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