Method for determining average channel capacity of underwater optical communication system based on partially coherent light
An optical communication system and channel capacity technology, applied in the field of communication, can solve the problems of reducing the scintillation index of fully coherent Gaussian beams, affecting the improvement of channel capacity of underwater wireless optical communication systems, and not outstanding performance.
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[0043] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes in detail with reference to the drawings and specific embodiments. This embodiment only represents the principle description of the present invention, and does not represent any limitation to the present invention.
[0044] Reference figure 1 , The implementation steps of the present invention are as follows:
[0045] Step 1. Based on IM / DD detection and NRZ-OOK modulation, establish a SISO-UWOC system, and obtain the average signal-to-noise ratio expression.
[0046] 1a) At the transmitting end, the on-off key control OOK binary data stream first passes through a pulse shaping filter to limit the transmission signal bandwidth and reduce the probability of receiving errors; then the binary electrical signal is modulated to the collimated Gaussian beam in the fundamental mode by the laser ; Then use a phase shifter to change the divergence of t...
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