80 Geometry based stochastic channel modeling e.Basie setting of communication environmen Step 2.Scatters placement Regular shaper scattering Iregular shaper scattering region(one/two-ring. region(randomly） ellipse.etc.) step3.Parameterization Finite number of scatters Infinite number of scatter Measurement-based Reference model model Finite number of scatters Simulation mode Channel Impulse Response(CIR) Figure 4.1 A general modeling procedure of geometry-based stochastic modeling approach. 80 Geometry based stochastic channel modeling Step 1. Basic setting of communication environment Step 2. Scatters placement Regular shaper scattering region (one/two-ring, ellipse, etc.) Step 3. Parameterization Finite number of scatters Infinite number of scatters Measurement-based model Reference model Step 4. Addition of all scatters' contributions Simulation model Channel Impulse Response (CIR) Finite number of scatters Irregular shaper scattering region (randomly) Figure 4.1 A general modeling procedure of geometry-based stochastic modeling approach