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The channel passband, therefore, partially coincides with the transmitted spectrum. In general, this condition requires that the transmitted signal be modulated by an appropriate carrier frequency and demodulated at the receiver. In that case, the model in Figs. 1b still applies; however, baseband-equivalent signals must be c 1999 by CRC Press LLC derived from their modulated (passband) counterparts. Baseband signalling and pulse shaping refers to the way in which a group of source bits is mapped to a baseband transmitted pulse.
An alternative is to transmit the square-root raised cosine pulse shape, which has frequency response P (f ) given by the square-root of the raised cosine frequency response in Eq. 18). Assuming an ideal channel, setting the receiver frequency response R(f ) = P (f ) then results in an overall raised cosine system response H (f ). 3 Nyquist Criterion with Matched Filtering Consider the transmission of an isolated pulse A0 δ(t). In this case the input to the receiver in Fig. 6a Raised cosine pulse.
For example, referring to Fig. 2, this corresponds to the input traversing the range −V to +V volts where V = 8 V is the design level of the quantizer. 7) was derived for waveforms with equally likely √ values, such as a triangle waveshape, that have a peak-to-peak value of 2V and an rms value of V / 3, where V is the design peak level of the quantizer. From a practical viewpoint, the quantizing noise at the output of the PCM decoder can be categorized into four types depending on the operating conditions.