The Richardson-Lucy Algorithm Based Demodulation Algorithms for ...

Introduction
Two-dimensional ISI Channel Model
Wiener Based Demodulation Algorithms
Richardson-Lucy Based Demodulation Algorithms
Comparison of Wiener and Richardson-Lucy Based Algorithms
Conclusions
Blind and Nonblind Richardson-Lucy Algorithms
Richardson-Lucy Algorithm for AWGN Channel
Richardson-Lucy Based Demodulation Algorithms
Blind Demodulation with Progressive Thresholding
BER Performance
Richardson-Lucy with Progressive Thresholding
Estimate s(x, y)
[
]
s (r+1) (x, y) = s (r) v(x, y)
(x, y)
s (r) (x, y) ∗ ∗h(x, y) ∗ ∗h(−x, −y)
Progressive thresholding
⎧
⎨ ν + 1
s (q) (x, y) ⇐ ν
⎩
s (q) (x, y)
if s (q) (x, y) ≥ 1/2 + ν + T (q)
if s (q) (x, y) ≤ 1/2 + ν − T (q)
elsewhere
where q = r + 1, T : {0, 1, 2, . . .} → [0, 1/2] is a monotone
decreasing function of iteration.
Hard-thresholding
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Zhijun Zhao and Richard E. Blahut
The Richardson-Lucy Algorithm Based Demodulation Algorithm