Figure 3
From: SER/BER expression for M-QAM OFDM systems with imperfect channel estimation and I/Q imbalance

Gray coded 8-PAM constellation with decision boundaries , where k and r represent the corresponding bit index and boundary index.
From: SER/BER expression for M-QAM OFDM systems with imperfect channel estimation and I/Q imbalance
Gray coded 8-PAM constellation with decision boundaries , where k and r represent the corresponding bit index and boundary index.