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Multi-Rate and Multi-BEP Transmission Scheme Using Adaptive Overlapping Pulse-Position Modulator and Power Controller in Optical CDMA Systems  

Miyazawa Takaya (Department of Information and Computer Science, Keio University)
Sasase Iwao (Department of Information and Computer Science, Keio University)
Publication Information
Journal of Communications and Networks / v.7, no.4, 2005 , pp. 462-470 More about this Journal
Abstract
We propose a multi-rate and multi-BEP transmission scheme using adaptive overlapping pulse-position modulator (OPPM) and optical power controller in optical code division multiple access (CDMA) networks. The proposed system achieves the multi-rate and multi-BEP transmission by accommodating users with different values of OPPM parameter and transmitted power in the same network. The proposed scheme has advantages that the system is not required to change the code length and number of weight depending on the required bit rate of a user and the difference of bit rates does not have so much effect on the bit error probabilities (BEPs). Moreover, the difference of transmitted powers does not cause the change of bit rate. We analyze the BEPs of the four multimedia service classes corresponding to the com­binations of high/low-rates and low/high-BEPs and show that the proposed scheme can easily achieve distinct differentiation of the service classes with the simple system configuration.
Keywords
Adaptive overlapping pulse-position modulator (OPPM); multi-BEP; multi-rate; optical code division multiple access (CDMA); optical hard limiter; power controller;
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