A method of determining a channel estimate of a wireless optical communications channel between at least one optical transmitting component and at least one optical receiving component, the method comprising: determining a location of at least one optical transmitting component; determining an orientation of the at least one optical transmitting component; determining a transmission characteristic of the at least one optical transmitting component; determining a location of at least one optical receiving component; determining an orientation of the at least one optical receiving component; determining a reception characteristic of the at least one optical receiving component; and calculating the channel estimate of the wireless optical communications channel based on the location of the at least one optical transmitting component, the orientation of the at least one optical transmitting component, the transmission characteristic of the at least one optical transmitting component, the location of the at least one optical receiving component, the orientation of the at least one optical receiving component and the reception characteristic of at least one optical receiving component; characterized in that the method further comprises: receiving the location of the at least one optical transmitting component, the orientation of the at least one optical transmitting component and the transmission characteristic of the at least one optical transmitting component; and/or receiving the location of the at least one optical receiving component, the orientation of the at least one optical receiving component and the reception characteristic of at least one optical receiving component. determining a location of at least one optical transmitting component; determining an orientation of the at least one optical transmitting component; determining a transmission characteristic of the at least one optical transmitting component; determining a location of at least one optical receiving component; determining an orientation of the at least one optical receiving component; determining a reception characteristic of the at least one optical receiving component; and calculating the channel estimate of the wireless optical communications channel based on the location of the at least one optical transmitting component, the orientation of the at least one optical transmitting component, the transmission characteristic of the at least one optical transmitting component, the location of the at least one optical receiving component, the orientation of the at least one optical receiving component and the reception characteristic of at least one optical receiving component; characterized in that the method further comprises: receiving the location of the at least one optical transmitting component, the orientation of the at least one optical transmitting component and the transmission characteristic of the at least one optical transmitting component; and/or receiving the location of the at least one optical receiving component, the orientation of the at least one optical receiving component and the reception characteristic of at least one optical receiving component. receiving the location of the at least one optical transmitting component, the orientation of the at least one optical transmitting component and the transmission characteristic of the at least one optical transmitting component; and/or receiving the location of the at least one optical receiving component, the orientation of the at least one optical receiving component and the reception characteristic of at least one optical receiving component. <EOS>