ECE 729 Information Theory Jan
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چکیده
pends on the input x, usually in some random way. The first difficulty we have is that the message, call it U , is usually not the same type of object as the acceptable inputs to the channel. For example, the message may be a baseband voice waveform, but the channel may accept only waveforms in a certain passband. Or the channel may be a fiber-optic cable that accepts only pulses of light. So we usually need some sort of converter to transform a message object into a channel-input object. Depending on the context, this converter may be called an encoder, a modulator, or a transmitter. The second difficulty we have is that the channel output y may not be the same type of object as the message U that is desired at the destination. For this reason, we need a deconverter that transforms the channel output y into an approximation of U , which we denote by Û . Depending on the context, the deconverter may be called a decoder, a demodulator, or a receiver. The concatenation of the converter, the channel, and the deconverter constitutes a communication system as shown in Figure 1.1.
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تاریخ انتشار 2010