Abstract

Coding techniques for the multiple-access problem are investigated. Two constructions of code sequences are considered, one for the OR channel and one for the Gaussian channel. A new construction of codes for the OR channel, which belongs to the family of cyclically permutable (CP) codes also known as optical orthogonal codes, removes the constraint of frame synchronization. This new construction of CP codes can be derived from known codes for the synchronous situation. The construction of codes for the Gaussian channel is for the synchronous case and has an exponential increase in the number of sequences when the length increases. For both constructions, we discuss the ability to handle noise and near-far effects. >

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