Performance enhancement of 2‐D optical CDMA systems using MCM signalling and heterodyne detection receiver

We propose 2‐D optical code‐division multiple‐access systems using multi‐code modulation signalling and heterodyne detection receiver. The proposed system's performance is theoretically analysed and compared with conventional ones using on–off keying, pulse–amplitude modulation and pulse–position modulation. The numerical results show that the proposed system outperforms the conventional ones in terms of required transmitted power, the number of supportable users and spectral efficiency. Copyright © 2012 John Wiley & Sons, Ltd.