What are the methods for SSB demodulation?
There are four ways to demodulate a transmitted single sideband (SSB) signal. Those four methods are: synchronous detection, • phasing method, • Weaver method, and • filtering method.
How phasing method can be used for SSB transmission?
The phasing method of SSB generation is based on the addition of two DSBSC signals, so phased that their upper sidebands (say) are identical in phase and amplitude, whilst their lower sidebands are of similar amplitude but opposite phase. This would be a wideband phase shifter, or Hilbert transformer.
What is phase shift method of SSB generation?
The phaseing method of SSB generation uses a phase shift technique that causes one of the side bands to be conceled out. A block diagram of a phasing type SSB generator is shown in fig. SSB Single Sideband Transmission Phase Shift Method. It uses two balanced modulators instead of one.
What is SSB SC demodulation?
The process of extracting an original message signal from SSBSC wave is known as detection or demodulation of SSBSC. Coherent detector is used for demodulating SSBSC wave.
What is the bandwidth required in SSB signal?
To transmit this using AM would require a bandwidth of 12 MHz. To reduce the amount of spectrum used, one sideband is transmitted fully, whereas only the lower frequencies of the other are transmitted. The high frequencies can be later enhanced using filters.
What is SSB band?
SSB (Single Sideband) is an obscure but very important way to communicate via radio. It is used primarily for two-way voice communication by ham radio operators, aircraft and air traffic control (ATC), ships at sea, military and spy networks. Occasionally some shortwave broadcast stations use this format.
Which function you have use for demodulation SSB SC?
What is phase shift method?
Laser rangefinders are often based on the phase shift method, a technique for measuring distances in the following way. A laser beam with sinusoidally modulated optical power is sent to a target. The phase shift obtained is 2π times the time of flight times the modulation frequency.
What is the bandwidth of SSB SC?
Bandwidth of SSBSC Wave We know that the DSBSC modulated wave contains two sidebands and its bandwidth is 2fm. Since the SSBSC modulated wave contains only one sideband, its bandwidth is half of the bandwidth of DSBSC modulated wave.
What is the use of SSB?
In radio communications, single-sideband modulation (SSB) or single-sideband suppressed-carrier modulation (SSB-SC) is a type of modulation used to transmit information, such as an audio signal, by radio waves. A refinement of amplitude modulation, it uses transmitter power and bandwidth more efficiently.
Which function you have use for demodulation SSB-SC?
How does single sideband modulation, SSB demodulation work?
Single sideband modulation. In order to demodulate single sideband, SSB, it is necessary to reintroduce the carrier. To achieve this two main elements are required: Local oscillator: The local oscillator signal is needed to provide the locally produced carrier signal to re-introduce into the signal.
What kind of detector is used to demodulate SSB transmissions?
SSB, single sideband is easily demodulated, but requires a little more circuitry than is needed for a basic AM envelope detector. To demodulate SSB transmissions a beat frequency oscillator or carrier insertion oscillator is used along with a mixer or product detector.
How does the phasing method in SSB work?
The Phasing Method The phasing method uses complex IQ processing to resolve the superposition of lower and upper sideband at audio frequencies. The incoming signal is directly converted to audio frequencies by a complex mixer creating I and Q components. The complex mixer requires a sine and cosine LO (e.g. implemented by a phase shift of 90°).
How is sideband suppression used in the phasing method?
Sideband suppression for the phasing method with different phase and amplitude errors shows the vulnerability to imbalances. Even a tiny amplitude error of only 0.1 dB and phase error of 0.1 degrees limits the suppression to 45 dB. Further reading for the phasing method: