Abstract
In an OCDMA network, the transmission signal over a fiber-optic channel is formed by the superimposing of pseudorandom OCDMA signals encoded from multiple channels. The signal is broadcast to each node (subscriber) in the network and a receiver in each node decodes the signal. If the output of the decoder in this receiver is an autocorrelation, the node can detect the information sent to it from the aforementioned pseudorandom signals. Alternatively, if the output of the decoder is a cross-correlation function (no apparent peak value), then the node cannot receive the information. Therefore, in order to implement OCDMA communication and networking, address codes with sufficient performance are required. When a set of code parameters is chosen, a code can be constructed that has as many codewords (corresponding to the number of nodes in the network) as necessary and good enough auto- and cross-correlation so that accurate synchronization can be implemented and the interference (called multiple access interference, MAI) from other nodes can be suppressed effectively by decoding the signals. This requires that the address codes satisfy two conditions[1, 2] :
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all address codewords can be easily identified from shifted versions, and
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all address codewords can be easily distinguished from (a possibly shifted version of) every other codeword.
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(2007). One-dimensional OCDMA Codes. In: Optical Code Division Multiple Access Communication Networks. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-68468-8_2
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