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Capacity of PPM on APD-detected optical channels

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4 Author(s)
S. Dolinar ; Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA ; D. Divsalar ; J. Hamkins ; F. Pollara

This report defines the fundamental parameters affecting the capacity of a soft-decision optical channel, and relates them to corresponding parameters for the well-understood AWGN channel. For example, just as the performance on a standard additive white Gaussian noise (AWGN) channel is fully characterized by its SNR, a corresponding Webb channel is fully characterized by its SNR, and a single additional skewness parameter δ2 which depends on the photon detector. In fact, this Webb channel reduces to the standard AWGN channel when δ2→∞. Numerical results show that the capacity of M-ary orthogonal signaling on the Webb channel exhibits the same brick-wall Shannon limit (M ln 2)/(M-1) as on the AWGN channel (≈-1.59 dB for large M), and that soft output channels offer a 3 dB advantage over hard output channels

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MILCOM 2000. 21st Century Military Communications Conference Proceedings  (Volume:2 )

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