Consider the quantized demodulator for binary PSK signals shown in Figure. The quantizer is a four-Level quantizer,
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Consider the quantized demodulator for binary PSK signals shown in Figure. The quantizer is a four-Level quantizer, normalized as in Figure. Evaluate the transition probabilities of the binary input-quarternary output discrete memory less channel so characterized. Hence, show that it is a symmetric channel. Assume that the transmitted signal energy per bit is E, and the additive white Gaussian noise has zero mean and power spectral density N0/2.
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Quantizer output +3 +1 Quantizer input -1 -3
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