  Various sectors are likely to carry a set of emerging applications while
targeting a reliable communication with low latency transmission. To address
this issue, upon a spectrally-efficient transmission, this paper investigates
the performance of a one full-dulpex (FD) relay system, and considers for that
purpose, two basic relaying schemes, namely the symbol-by-symbol transmission,
i.e., amplify-and-forward (AF) and the block-by-block transmission, i.e.,
selective decode-and-forward (SDF). The conducted analysis presents an
exhaustive comparison, covering both schemes, over two different transmission
modes, i.e., the non combining mode where the best link, direct or relay link
is decoded and the signals combining mode, where direct and relay links are
combined at the receiver side. While targeting latency purpose as a necessity,
simulations show a refined results of performed comparisons, and reveal that AF
relaying scheme is more adapted to combining mode, whereas the SDF relaying
scheme is more suitable for non combining mode.
