h(t)=1M∑M−1k=0δ(t−tk)⋅exp(−α⋅ℓ/cos(γk))
H(f)=1M∑M−1k=0exp(j2πftk)⋅exp(−α⋅ℓ/cos(γk))
with:
tk=ℓc0⋅nK⋅cos(γk)
γk=(2kM−1−1)⋅γcrit, k∈{0,⋯,M−1}
M number of modes
α attenuation in dB/m