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Table 1 Different useful cases for the OFDM multicarrier transmission

From: DF-based sum-rate optimization for multicarrier multiple access relay channel

  Decoding order Decoding order Case
  at the relay at the destination  
Direct transmission N.A. No decoding order 1
The relay forwards x b [k] x b [k] x b [k]→x a [k] 2
The relay forwards x a [k] and x b [k] x b [k]→x a [k] x b [k]→x a [k] 3
The relay forwards x a [k] and x b [k] x a [k]→x b [k] x b [k]→x a [k] 4
The relay forwards x a [k] x a [k] x a [k]→x b [k] 5
The relay forwards x a [k] and x b [k] x a [k]→x b [k] x a [k]→x b [k] 6
The relay forwards x a [k] and x b [k] x b [k]→x a [k] x a [k]→x b [k] 7
  1. N.A., not applicable.