2.55 GHz城市微蜂窝三维宽带时变信道特性分析与建模研究

doi:10.11959/j.issn.1000-436x.2017205

Abstract

Abstract:

Based on the outdoor microcell MIMO channel measurement campaign at 2.55 GHz,the time-evolution characteristics of three-dimensional wideband channel were studied.The SAGE algorithm was used to extract multipath parameters such as azimuth and elevation angle of departure and arrival.A bidirectional matching algorithm was applied to tracing multipath and the "birth-death" process.The statistical characteristics of multipath birth,lifespan,multipath initial and evolution parameters were analyzed and modeled based on the cross-correlations of multipath parameters.A time-varying channel model with multipath birth-death process was developed.The model parameter table and a detailed flowchart were offered for time-varying channel simulations.The proposed model was validated by comparing the root-mean-square (RMS) of delay spread and angular spread between the simulated and measured results.The channel model proposed can be applied in time-varying channel simulation for urban microcells and it’s also very important to be referred in 5G dynamic channel modeling.

Key words: urban microcell, SAGE, multipath birth-death process, time-varying channel, channel simulation and valida-tion, 5G dynamic channel modeling

CLC Number:

TN928

Shu LI,Xiong-wen ZHAO,Rui ZHANG,Qi WANG,Sui-yan GENG. Research on characterization and modeling for 3D wideband time-varying channels for urban microcells at 2.55 GHz[J]. Journal on Communications, 2017, 38(10): 135-145.

Figures/Tables 12

时变信道参数	最佳拟合统计分布	参数值	拟合误差标准差
多径生命周期Δs	指数分布：Δs～E(λ_Δs)	λ_Δs=0.74	λ_Δs:0.017
每快照多径出生数B	泊松分布为B～P(λ_B)	λ_B=2.24	λ_B:0.063
多径初始时延τ	指数分布为τ～E(λ_τ)	$\frac{1}{λ_{τ}} = 57.7 n s$	$\frac{1}{λ_{τ}} : 0.50 n s$
			μ₁:0.041
多径初始AoD ψ₁	tlocation-scaleψ₁～t(μ₁,σ₁,v₁)	μ₁=0.31,σ₁=3.32,v₁=0.47 °	σ₁:0.072
			v₁:0.006
			μ₂:0.058
多径初始EoD θ₁	tlocation-scale：θ₁～t(μ₂,σ₂,v₂)	μ₂=0.54,σ₂=6.94,v₂=0.84 °	σ_2:0.084
			v₂:0.019
			μ₃:0.021
多径初始AoAψ₂	tlocation-scale：ψ₂～t(μ₃,σ₃,v₃)	μ₃=-0.18,σ₃=1.84,v₃=0.81 °	σ_3:0.038
			v₃:0.008
			μ₄:0.028
多径初始EoA θ₂	tlocation-scale：θ₂～t(μ₄,σ₄,v₄)	μ₄=-0.08,σ₄=2.20,ν₄=0.85 °	σ_4:0.033
			v₄:0.012
多径初始功率P	式(11)	μ_P=-9.94,σ_P=5.62 dB	μ_P:0.049
		k_P～τ=-0.017 dB/ns	σ_P:0.035
长周期多径时延变化率k_τ	正态分布为 $k_{τ} ~ N (μ_{τ}, σ_{τ})$	μ_τ=-1.50,σ_τ=3.90 ns/snapshot	μ_τ::0.24
			σ_τ:0.17
长周期多径AoD变化率 $k_{φ_{1}}$	正态分布为 $k_{φ_{1}} \sim N (μ_{φ_{1}}, σ_{φ_{1}})$	$μ_{φ_{1}} = 2.00, σ_{φ_{1}} = 2.07 r a d / s n a p s h o t$	$μ_{φ_{1}} : 0.43$
			$σ_{φ_{1}} : 0.31$
长周期多径EoD变化率 $k_{θ_{1}}$	正态分布为 $k_{θ_{1}} ~ N (μ_{θ_{1}}, σ_{θ_{1}})$	$μ_{θ_{1}} = 0.13, σ_{θ_{1}} = 2.00 r a d / s n a p s h o t$	$μ_{θ_{1}} : 0.036$
			$σ_{θ_{1}} : 0.250$
长周期多径AoA变化率 $k_{φ_{2}}$	正态分布为 $k_{φ_{2}} \sim N (μ_{φ_{2}}, σ_{φ_{2}})$	$μ_{φ_{2}} = 0.01, σ_{φ_{2}} = 0.15 r a d / s n a p s h o t$	$μ_{φ_{2}} : 0.059$
			$σ_{φ_{2}} : 0.042$
长周期多径EoA变化率 $k_{θ_{2}}$	正态分布为 $k_{θ_{2}} ~ N (μ_{θ_{2}}, σ_{θ_{2}})$	$μ_{θ_{2}} = - 0.03, σ_{θ_{2}} = 0.51 r a d / s n a p s h o t$	$μ_{θ_{2}} : 0.085$
			$σ_{θ_{2}} : 0.006$
长周期多径功率变化	式(14)	—	—

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参数	数值
载频	2.55 GHz
带宽	200 MHz (null-to-null)
码长	511 chip
时延分辨率	10 ns
最大可测额外时延	5.11 μs
发射/接收天线	ODA / 16单元平面阵列
极化	交叉极化( ±45°)
发射天线高度	1.7 m
接收天线高度	8m

参数	相关系数ρ
Delay vs AoA	0.13
Delay vs AoD	-0.01
Delay vs EoA	0.06
Delay vs EoD	-0.05
AoA vs AoD	0.00
AoA vs EoA	-0.03
AoA vs EoD	0.04
AoD vs EoA	0.02
AoD vs EoD	0.05
EoA vs EoD	0.02

Research on characterization and modeling for 3D wideband time-varying channels for urban microcells at 2.55 GHz

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References 31

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