  In mobile molecular communication (MC), inter-symbol interference (ISI) can
be mitigated by power control, requiring accurate estimates of the distance
from transmitter to receiver. We present two power control strategies based on
binary concentration shift keying (BCSK), namely BCSK with power control based
on distance (BCSK-d), and BCSK with power control jointly considering distance
and residual molecules in the channel (BCSK-d-RM). Performance of BCSK-d and
BCSK-d-RM are analyzed in terms of the bit error rate (BER), the average energy
consumption per bit, and the optimal detection threshold. Simulation results
show that BCSK-d-RM and BCSK-d outperform BCSK in BER with the varying distance
and the number of transmitted molecules. As BCSK-d-RM has higher performance,
while BCSK-d has lower complexity, these schemes present a useful design
tradeoff for mobile MC.
