Interference forwarding in a Z-channel makes interference stronger, which in turn enables usage of simple detectors like successive interference canceler (SIC) at interference-limited destination. In this work, the following protocols with SIC at the interference-limited destination are investigated: direct transmission (  $SIC_{Direct}$  ), half-duplex decode-and-forward (  $SIC_{DF}$  ), and half-duplex amplify-and-forward (  $SIC_{AF}$  ) protocols. The achievable diversity orders of these protocols using M-PAM and M-QAM modulation are obtained. Moreover, minimum required exponential orders of the average received signal powers at the relay and interference-limited destination to restore full diversity are presented. The   $SIC_{AF}$   and   $SIC_{DF}$   protocols are shown to achieve the same diversity order as that of the orthogonal transmission scheme while achieving better spectral efficiency than the orthogonal transmission. Closed-form expressions for the achievable diversity gain regions (DGRs) with the   $SIC_{Direct}$  ,   $SIC_{DF}$  , and   $SIC_{AF}$   protocols are derived. Selective decode-and-forward with SIC (  $SIC_{SDF}$  ) is also considered. The multiplexing gain regions and the interference levels where the   $SIC_{AF}$   and   $SIC_{SDF}$   protocols achieve better DGR than the   $SIC_{Direct}$   protocol are obtained.
['Rajendra Prasad Sirigina', 'A. S. Madhukumar']
On the Symbol Error Rate and Diversity Gain Region of the Relay-Assisted Z-channel