1Y. Okumaura, E. Ohmori, T. Kawano, and K. Fu- kuda.Field Strength and its Variability in the VHF and UHF Land Mobile Service[J]. Review Electri- cal Communication Laboratory, 1969,6(10):825-873.
3Hata, Masaharu.Empirical Formula for Propagation Loss in Land Mobile Radio Services[J].IEEE Transaction on Vehicular Technolo- gy. 1980,3(29):317-325.
5Walfisch, J. ,Bertoni, H.L.A Theoretical Model of UHF Propagation in Urban Environments[J].IEEE Trans. on Antenas and Propaga- tion. 1988,12(36): 1788-1796.
6Y Okumura, E Ohmori, T Kawano, et al. Field strength and its variability in VHF and UHF land mo- bile radio serviee[J]. Review Electrical Communication Laboratory, 1969,16 : 825-873.
7张威.GSM网络优化一原理与工程[M].北京:北京邮电大学出版社,2005.
8J J Egli. Radio propagation above 40 MC over irregular terrain. Proc. IRE, 1957,45(10):1383-1391.