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Table 1 Direction of measurement and required number of channel uses to estimate all first-hop and second-hop channel coefficients.

From: Comparison of Channel Estimation Protocols for Coherent AF Relaying Networks in the Presence of Additive Noise and LO Phase Noise

  First-hop channel Second-hop channel Required number of channel uses
Protocol A1 Forward direction Forward direction
Protocol A2 Backward direction Backward direction
Protocol B1 Forward direction Backward direction
Protocol B2 Backward direction Forward direction