A Modular Encoder Design Scheme for Turbo-Encoded BPPM-OCDMA System

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Executive Summary

A Turbo-encoded Optical Code Division Multiple Access (OCDMA) system has been simulated and an application specific design process has been proposed to implement a Turbo-encoded OCDMA modulated using Binary Pulse Position Modulation (BPPM) for transmission over optical fiber channels. The design process follows a modular approach and consists of four distinct modules RSC (Recursive Systematic Code) encoder, pseudorandom interleaver, parallel to serial converter, BPPM circuit. A reference system has been designed for a frame size of 16 bits. Bit error rates were calculated for this reference design, assuming 10 simultaneous users using 5 iterations of the MAP decoding algorithm at various values of SNR for the two obtainable code rates (1/2; 1/3).

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