计算机工程
計算機工程
계산궤공정
COMPUTER ENGINEERING
2014年
3期
143-146,151
,共5页
唐亚平%徐大专%朱秋明%任佳敏%周生奎%黄攀
唐亞平%徐大專%硃鞦明%任佳敏%週生奎%黃攀
당아평%서대전%주추명%임가민%주생규%황반
三维射线跟踪%电波传播%损耗预测%反向算法%加速算法%绕射
三維射線跟蹤%電波傳播%損耗預測%反嚮算法%加速算法%繞射
삼유사선근종%전파전파%손모예측%반향산법%가속산법%요사
3D ray-tracing%radio wave propagation%loss prediction%reverse algorithm%acceleration algorithm%diffraction
在复杂城市传播环境中，搜索三阶及以上反射及绕射路径能提高电波损耗预测精度，但现有研究主要针对二阶及以下反射及绕射路径。为此，提出一种任意阶反射及绕射反向射线跟踪算法。该算法基于镜像原理和一致性绕射理论，反向搜索确定射线传播路径，同时通过正向筛选过程建立可见多边形、棱边和场点，从而减少相交测试次数，降低高阶路径的搜索复杂度。在此基础上论述反射及绕射次数等因素对电波传播预测精度和复杂度的影响。数值仿真结果表明，考虑高阶传播路径能有效提高预测精度和预测效率，为三维城市中电信基站的规划设计和网络优化提供依据。
在複雜城市傳播環境中，搜索三階及以上反射及繞射路徑能提高電波損耗預測精度，但現有研究主要針對二階及以下反射及繞射路徑。為此，提齣一種任意階反射及繞射反嚮射線跟蹤算法。該算法基于鏡像原理和一緻性繞射理論，反嚮搜索確定射線傳播路徑，同時通過正嚮篩選過程建立可見多邊形、稜邊和場點，從而減少相交測試次數，降低高階路徑的搜索複雜度。在此基礎上論述反射及繞射次數等因素對電波傳播預測精度和複雜度的影響。數值倣真結果錶明，攷慮高階傳播路徑能有效提高預測精度和預測效率，為三維城市中電信基站的規劃設計和網絡優化提供依據。
재복잡성시전파배경중，수색삼계급이상반사급요사로경능제고전파손모예측정도，단현유연구주요침대이계급이하반사급요사로경。위차，제출일충임의계반사급요사반향사선근종산법。해산법기우경상원리화일치성요사이론，반향수색학정사선전파로경，동시통과정향사선과정건립가견다변형、릉변화장점，종이감소상교측시차수，강저고계로경적수색복잡도。재차기출상논술반사급요사차수등인소대전파전파예측정도화복잡도적영향。수치방진결과표명，고필고계전파로경능유효제고예측정도화예측효솔，위삼유성시중전신기참적규화설계화망락우화제공의거。
In traditional reverse ray-tracing and predicting model, the order of reflection and diffraction is two or less. In this paper, a new 3D reverse ray-tracing algorithm for accurate field strength prediction is proposed, particularly suitable for urban scenarios. The orders of reflection and diffraction are arbitrary. Virtual source tree is created by directing search, and after that all valid paths from transmitter to receiver can be found quickly by inversing search. The effects of order of reflection and diffraction on predicting precision and complexity are also analyzed. Numerical results of the simulation show that this algorithm has higher accuracy and efficiency, which is quite useful for the design and optimization of wireless network.
