  Co-channel interference in the downlink of LiFi attocell networks
significantly decreases the network performance in terms of rate. Analysis of
multiple access schemes is essential to mitigate interference and improve rate.
The light emitting diodes (LEDs) being centrally monitored, the time division
multiple access (TDMA) scheme over the LEDs will be suitable to analyze. This
work considers the interference characterization in [1] over M-PAM modulated
signals to derive an exact expression for the goodput G of the time scheduled
attocell network, which is arranged as a deterministic square lattice in two
dimensions. Given this TDMA over the LEDs, numerical simulations show that the
LEDs can be optimally time scheduled to maximize the goodput, which implies
that the TDMA mitigates interference in an attocell network compared to the
case when the LEDs are unscheduled.
