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Two multirate techniques, so-called the multiple-code (MC) and multicode-keying (MK) schemes, were recently proposed to support multimedia services with different bit rates in asynchronous optical code-division multiple-access (O-CDMA) systems. In the MC scheme, a user maps multiple data bit 1s to multiple code matrices and transmits them at the same time. In the MK scheme, a user only transmits one...
Multirate transmission techniques, such as multiple-code (MC) and multicode-keying (MK) schemes, have been proposed for asynchronous optical code-division multiple-access (O-CDMA) systems supporting multimedia services. A user in the MC scheme transmits several codes at the same time to represent the transmission of several data bit ones. The number of parallel codes transmitted at a time is proportional...
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