From: Data-precoded algorithm for multiple-relay-assisted systems
T s
L - 1
L
L + 1
L + 2
Active links
BS → RN L
BS → RNL + 1
BS → RNL + 2
BS → RNL + 3
RNL - 1→ UT
RN L → UT
RNL + 1→ UT
RNL + 2→ UT