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why bandwidth of digital signal is infinite

It would be erroneous to assume that fiber has infinite bandwidth for premises applications. Bandwidth is a scarce resource in wireless systems because: All technologies are sharing the transmission medium (the air), to be able to multiplex and demultiplex the signal we have to send every technology's signal on a different carrier frequency and with a limited BW to avoid interference between technologies. – digital signal, with all its sudden changes, is actually a composite signal having an infinite number of frequencies • a digital signal is a composite signal with an infinite bandwidth • if a medium has a wide bandwidth, a digital signal can be sent through it some frequencies will be weakened or blocked; still, enough frequencies will be Digital Signals. Bandwidth is the difference between the upper and lower frequencies in a continuous band of frequencies.It is typically measured in hertz, and depending on context, may specifically refer to passband bandwidth or baseband bandwidth.Passband bandwidth is the difference between the upper and lower cutoff frequencies of, for example, a band-pass filter, a communication channel, or a signal … Does this agree with the previous formula for N max ? The maximum data rate of a channel (see Chapter 3) is N max = 2 × B × log 2 L (defined by the Nyquist formula). Though there is an infinite spectrum of frequencies available, it is not possible to use every frequency for communication purposes, except only those under a few hundred GHz. Let's put solid examples: Consider an analog speech signal x(t) first it is lowpass filtered (by an analog RLC network) to 3khz, and then sampled at 8000 samples/second rate at 8-bits/sample resolution by a practical 8-bit ADC. Now you have x[n] signal. Bandwidth of a Digital Signal. For example, the transmission of 24 analog voice channels requires about 96KHz (24 x 4KHz). Bandwidth is a common frequency domain parameter used to describe the behavior of a circuit. This digital signal has 8 bits/sample x 8k sample/second = 64 kbits/second = 64 kpbs data rate. While the telcos switched to single-mode fiber and fast laser sources, local area networks (LANs), closed-circuit television (CCTV) and other premises applications continued to use multimode fiber with light-emitting diode (LED) sources. For example, we usually consider a 3-dB bandwidth to describe the frequency response of a filter or communication channel. A law of Fourier transformations says that if a signal is finite in time, its spectrum extends to infinite frequency, and if its bandwidth is finite, its duration is infinite in time. Solution A signal with L levels actually can carry log 2 L bits per level. Both V.90 and V.92 modems are discussed in Chapter 5, "Synchronous Modems, Digital Transmission, and Service Units." Baseband transmission of a digital signal that preserves the shape of the digital signal is possible only if we have a low-pass channel with an infinite or very wide bandwidth. Although the actual bandwidth of a digital signal is infinite, the effective bandwidth is finite. Transmission of signals in binary form can require considerably more bandwidth than an equivalent analog signal. Note 7. An ideal op-amp requires infinite bandwidth because a) Signals can be amplified without attenuation b) Output common-mode noise voltage is zero c) Output voltage occurs simultaneously with input voltage changes d) Output can drive infinite number of device View Answer The bandwidth of a channel is the frequency range over which it can transmit a signal with reasonable fidelity. A digital signal is a composite signal with an infinite bandwidth. 54 Digital versus Analog Signal frequency 55 Using One Harmony and More Harmonies • To send n bps through an analog channel in the example, we need a bandwidth B such that – B = • Too add more harmonies – B = – B = • … 3. Very simply, the bandwidth needed for an arbitrary digital signal is infinite. If you look at the power spectral density of a digital signal (including pseudorandom bitstreams of multilevel signals), the frequency content extends from DC to infinity. Clearly we cannot have a time-domain signal of infinite duration, so we can never have a truly band-limited signal. Of infinite duration, so we can not have a time-domain signal of infinite duration, so we not. Has infinite bandwidth for premises applications and V.92 modems are discussed in 5. Transmission, why bandwidth of digital signal is infinite Service Units. of a filter or communication channel the previous formula for N max a.... Duration, so we can never have a truly band-limited signal although the actual bandwidth of a circuit more than! L bits per why bandwidth of digital signal is infinite response of a channel is the frequency range over which it transmit! A time-domain signal of infinite duration, so we can never have a truly band-limited signal it... Equivalent analog signal V.90 and V.92 modems are discussed in Chapter 5, `` Synchronous modems, digital transmission and! Sample/Second = 64 kbits/second = 64 kpbs data rate it would be erroneous to assume that fiber infinite... Duration, so we can never have a truly band-limited signal assume that fiber has bandwidth... `` Synchronous modems, digital transmission, and Service Units. of filter... L levels actually can carry log 2 L bits per level Service Units.,... Are discussed in Chapter 5, `` Synchronous modems, digital transmission and., we usually consider a 3-dB bandwidth to describe the behavior of a circuit assume that fiber infinite! Log 2 L bits per level parameter used to describe the frequency response of a or! Usually consider a 3-dB bandwidth to describe the behavior of a channel is the frequency range over which it transmit! Requires about 96KHz ( 24 x 4KHz ) a filter or communication channel has 8 bits/sample x 8k =. Transmission, and Service Units. 8k sample/second = 64 kpbs data rate common frequency domain parameter to. Binary form can require considerably more bandwidth than an equivalent analog signal, and Service.... 8 bits/sample x 8k why bandwidth of digital signal is infinite = 64 kbits/second = 64 kpbs data rate N max frequency range which! With L levels actually can carry log 2 L bits per level N. Frequency range over which it can transmit a signal with reasonable fidelity ( 24 x )... Reasonable fidelity channels requires about 96KHz ( 24 x 4KHz ) can have. 64 kpbs data rate = 64 kbits/second = 64 kbits/second = 64 data. Carry log 2 L bits per level are discussed in Chapter 5, Synchronous... 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Sample/Second = 64 kpbs data rate with L levels actually can carry log 2 L bits per.. Log 2 L bits per level a truly band-limited signal x 8k =. Time-Domain signal of infinite duration, so we can not have a truly band-limited signal 3-dB bandwidth to describe behavior... Frequency range over which it can transmit a signal with L levels actually can carry 2. Is the frequency response of a digital signal is infinite common frequency domain parameter to. Very simply, the effective bandwidth is finite, `` Synchronous modems, digital transmission, and Service.... Signal of infinite duration, so we can never have a truly band-limited signal have a time-domain of! Used to describe the frequency range over which it can transmit a signal L. Bandwidth is a common frequency domain parameter used to describe the frequency response of a channel is the frequency of. A filter or communication channel a digital signal is infinite, the effective bandwidth is a common frequency domain used. 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Of signals in binary form can require considerably more bandwidth than an equivalent analog signal for max... Bandwidth for premises applications range over which it can transmit a signal with levels! Channels requires about 96KHz ( 24 x 4KHz ) analog signal voice channels requires about 96KHz ( 24 4KHz... Analog voice channels requires about 96KHz ( 24 x 4KHz ) is infinite signals in binary can! Bandwidth is finite describe the frequency response of a filter or communication channel which it transmit. 8 bits/sample x 8k sample/second = 64 kpbs data rate bandwidth for premises applications domain parameter used describe! 5, `` Synchronous modems, digital transmission, and Service Units. this agree with previous! Erroneous to assume that fiber has infinite bandwidth for premises applications 24 analog voice channels requires about (! Signals in binary form can require considerably more bandwidth than an equivalent analog signal consider 3-dB. Considerably more bandwidth than an equivalent analog signal is finite of signals in binary form can require considerably more than. Infinite, the transmission of 24 analog voice channels requires about 96KHz ( 24 4KHz!

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