Control of an optical transmitter in a radio over fibre system

A processing circuit configured to determine an operating parameter of an optical transmitter in a radio over fiber system, the system comprising a base station comprising a first base station node and a second base station node connected by an optical communication link, wherein at least one the base station nodes comprises an optical transmitter, the processing circuit comprising:

• an input circuit configured to receive signal quality parameters for a plurality of user equipments served by the base station;
• one or more processors configured to determine an operating parameter of the optical transmitter using the received signal quality parameters of the plurality of user equipments,
• wherein the determining of an operating parameter of the optical transmitter uses a change in value of signal quality parameters for a same user equipment, and signal quality parameters are inversely weighted based on their change in value;
• and
• an output circuit configured to output the determined operating parameter of the optical transmitter,
• wherein the operating parameter of the optical transmitter is a modulation parameter comprising modulation depth of the optical transmitter,
• wherein a signal quality parameter of the received signal quality parameters is based on the optical transmitter, and on a wireless channel between a user equipment of the plurality of user equipments and the base station, and
• wherein the signal quality parameter is indicative of an end-to-end channel quality.

A non-transitory computer-readable medium comprising, stored thereupon, a computer program product comprising a machine-readable medium carrying instructions that, when executed by a processor in a controller of an optical transmitter in a radio over fiber system, the system comprising a base station comprising a first base station node and a second base station node connected by an optical communication link, wherein at least one of the base station nodes comprises an optical transmitter, cause the processor to:

• receive signal quality parameters for a plurality of user equipments served by the base station;
• and determine an operating parameter of the optical transmitter using the received signal quality parameters of the plurality of user equipments,
• wherein the determining of an operating parameter of the optical transmitter uses a change in value of signal quality parameters for a same user equipment, and signal quality parameters are inversely weighted based on their change in value,
• wherein the operating parameter of the optical transmitter is a modulation parameter comprising modulation depth of the optical transmitter,
• wherein a signal quality parameter of the received signal quality parameters is based on the optical transmitter and on a wireless channel between a user equipment of the plurality of user equipments and the base station, and
• wherein the signal quality parameter is indicative of an end-to-end channel quality.