Abstract: An elevator system (2) comprises an elevator car (4a-d) that is moveable within a hoistway (6a-d). The elevator car (4a-d) comprises a first wireless communication unit (12a-d). A controller (8a-d) is arranged to communicate with the elevator car (4a-d) , the controller (8a-d) comprising a second wireless communication unit (14a-d). The first and second wireless communication units (12a-d, 14a-d) are arranged to exchange elevator operational data using a wireless communication protocol. Each data symbol within a set of data symbols corresponding to the elevator operational data is modulated onto a plurality of orthogonal sub-carriers using an orthogonal frequency division multiplexing modulation scheme. The modulated plurality of orthogonal sub-carriers are transmitted between the first and second wireless communication units (12a-d, 14a-d) over a wireless interface (16a-d).