Multiuser access for optical communications

An access point or processing unit of a communication network, the access point or processing unit being configured to process or encode data for transmission to the mobile communication devices by:

• determining channel state information, CSI, relating to one or more, e.g. a plurality of, the mobile communication devices;
• for each of one or more sub-carriers, determining which communication devices can communicate using the respective subcarrier according to, or based on, the channel state information or data derived therefrom;
• allocating mobile communication devices to sub-carriers upon which each mobile communication device can communicate;
• and
• providing data for each mobile communication device on the sub-carriers to which they've been allocated.

A non-transient computer readable storage medium comprising computer readable instructions that, when processed by at least one processor, cause the at least one processor to:

• determine or receive channel state information, CSI, relating to a plurality of the communication devices;
• for each of one or more sub-carriers, determine which communication devices can communicate using the respective subcarrier according to, or based on, the channel state information or data derived therefrom;
• allocate communication devices to sub-carriers upon which each communication device can communicate;
• and
• provide data for at least one or more or each communication device on the sub-carriers to which the respective communication device has been allocated.