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SSBSC uses 1/2 of the bandwidth and 1/6 as much RF power as AM modulated 100% .
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∙ 10y ago
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What is percentage power saving if AM transmitter with modulation index m equals 0.5 is replaced by SSBSC transmitter with same modulation index?
Pt=Pc+2Psf, m=0.5 ,Psf=0.0625, saving in power is 100-6.25 % = 94.75%
What is a SSBSC signal?
Single Side Band Suppressed Carrier. This is a modification of AM (Amplitude Modulation) that both reduces required transmitter power and signal bandwidth. The carrier is first modulated by the signal the same as in ordinary AM, then is sent through a bandpass filter to remove one sideband and the carrier. To demodulate it and recover the original signal the receiver must reinsert the carrier using a BFO (Beat Frequency Oscillator) and Mixer.
What are advantages and disadvantages of ssbsc transmission compared with full-carrier AM?
in SSB-SC only one side band of AM s/g is sent frm Transmitter instead of both sideband and carrier in that of DSB-FC(DSB-FC consist of upper side band ,lower side band both conveying same information i.e. mirror image of each other and original carrier i.e. after the process of modeulation carrier is also present in DSF-FC s/g). thus DSB-FC = USB+LSB+Cariier hence total power in DSB-FC= cariier pow+ usb pow+lsb pow SSB-SC = either USB or lsb toatal pow= pow in single side band 1.using SSB-Sc power is saved. 2.Bandwith is reduced 3. noise immunity is more.
Disadvantages of SSBSC transmission compared with full-carrier AM?
A BFO in the receiver is needed to reinsert the carrier before detection.
What the difference between single side band single carrier transmission and full carrier AM?
1. Single-sideband transmission requires only half as much bandwidth as double sideband.2. SSBSC require less total transmitted power than full carrier AMIn full carrier AM, the transmitted signal consists of two sidebands (containing the transmitted information) and the carrier signal. Long ago, it was realized that both sidebands contained the same information, and the carrier signal could be supplied by the receiver. Thus, if you suppress transmitting the carrier and one sideband, you can use the available power to increase the power in the remaining sideband.
What is disadvantages of ssbsc transmission compared with full-carrier AM?
Complexity of the receiver. SSBSC says it all: Single Side-Band, Suppressed Carrier The spectrum of an AM signal includes two (mirror) sidebands, on either side of the carrier (the nominal AM frequency on the dial). By suppressing a sideband and the carrier, the transmitter can spare the energy that would otherwise go into those signal components, which can represent two-thirds of the total energy in a standard AM signal. This comes at a cost of higher complexity in the receiver, since it needs to recreate the missing parts of the signal before it can demodulate it. And since there is no carrier frequency, a superetherodyne receiver (that can lock on to the carrier, like all modern AM receivers) will not work; other strategies must be used to compensate carrier drift.
What are advantages of AM over SSB?
Complexity of the receiver. SSBSC says it all: Single Side-Band, Suppressed Carrier The spectrum of an AM signal includes two (mirror) sidebands, on either side of the carrier (the nominal AM frequency on the dial). By suppressing a sideband and the carrier, the transmitter can spare the energy that would otherwise go into those signal components, which can represent two-thirds of the total energy in a standard AM signal. This comes at a cost of higher complexity in the receiver, since it needs to recreate the missing parts of the signal before it can demodulate it. And since there is no carrier frequency, a superetherodyne receiver (that can lock on to the carrier, like all modern AM receivers) will not work; other strategies must be used to compensate carrier drift.
