A voice-grade AWGN (Additive White Gaussian noise) telephone channel has a bandwidth of 4.0 kHz and two-sided noise power spectral density η/2=2.5〖X10〗^(-5) Watt per Hz.
If the information at the rate of 52 kbps is to be transmitted over this channel with arbitrarily small bit error rate, then the minimum bit-energy E_b (in mJ/bit) necessary is __________

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