Optical CDMA with interference cancellation

A multiple-user interference reduction technique is proposed for optical code-division multiple-access systems. Data symbols from each user are encoded using pulse-position modulation scheme before multiplexing. Modified prime sequences are adopted as the signature codes in the multiplexing process. An interesting property of this code is the uniformity of the cross-correlation among its sequences. This property is main key in constructing the multiple-access interference canceller. In addition to its simplicity, this canceller offers a great improvement in the error probability as compared to the system without cancellation