  The next generation of wireless communication technology is anticipated to
address the communication reliability challenges encountered in high-speed
mobile communication scenarios. An Orthogonal Time Frequency Space (OTFS)
system has been introduced as a solution that effectively mitigates these
issues. However, OTFS is associated with relatively high pilot overhead and
multiuser multiplexing overhead. In response to these concerns within the OTFS
framework, a novel modulation technology known as Affine Frequency Division
Multiplexing (AFDM) which is based on the discrete affine Fourier transform has
emerged. AFDM effectively resolves the challenges by achieving full diversity
through parameter adjustments aligned with the channel's delay-Doppler profile.
Consequently, AFDM is capable of achieving performance levels comparable to
OTFS. As the research on AFDM detection is currently limited, we present a
low-complexity yet efficient message passing (MP) algorithm. This algorithm
handles joint interference cancellation and detection while capitalizing on the
inherent sparsity of the channel. Based on simulation results, the MP detection
algorithm outperforms Minimum Mean Square Error (MMSE) and Maximal Ratio
Combining (MRC) detection techniques.
