Open Access

Algorithm 1

Proposed Two-Stage Channel Estimation Scheme

Require: , , W, V, L t
 1: Stage 1: Set the absorbing mode and estimate hd,k
 2: Stage 2: Set the IRS to the perfect reflecting mode
 3: Compute , and set
 4: for 1 ≤ i≤ L t do
 5: Detect
 6: Select ,
 7: Estimate
 8: Calculate
 9: end for
 10:
Ensure: ,

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