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The attenuation constant has the similar calculating expression, but different coefficients in different tunnels, like circular tunnel, rectangular tunnel, arched tunnel and ellipse tunnel. An analysis of the relationship between the attenuation rate in tunnels with arbitrary cross sections is given in the paper after the equivalence of the cross section area, the effects of tunnel dimensions on the...
The basic principles and structure of HDB3 was briefly introduced in this paper, and the shortcomings of the existing HDB3 encoder and decoder was analyzed. Then a new design of HDB3 encoder and decoder based on FPGA was proposed, and the hardware design circuit and software simulation were introduced. The simulation was achieved through the VERILOG-HDL in EP2C35F672C8 chip of CycloneII series in...
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