What is modulation and its techniques?
What is modulation and its techniques?
Modulation is the process of converting data into electrical signals optimized for transmission. Modulation techniques are roughly divided into four types: Analog modulation, Digital modulation, Pulse modulation , and Spread spectrum method. Digital modulation involves transmission of binary signals (0 and 1).
Which type of modulation is used in satellite navigation system?
BPSK modulation
GPS satellites transmit radio signals using BPSK modulation. DSSS an extension of BPSK occupies a wide bandwidth of PRN waveform.
Why are digital modulation techniques used in satellite communication?
The advantages provided by digital modulation techniques include: Better performance. Better Error detection and correction efficiency. Better Signal to noise ratio so less prone to interference or noise.
What are the different digital modulation techniques?
The most common digital modulation techniques are:
- Phase-shift keying (PSK)
- Frequency-shift keying (FSK)
- Amplitude-shift keying (ASK)
- On-off keying (OOK), the most common ASK form.
- Quadrature amplitude modulation (QAM), a combination of PSK and ASK.
- Continuous phase modulation (CPM) methods.
Why modulation techniques are important in communication system?
Modulation allows us to send a signal over a bandpass frequency range. If every signal gets its own frequency range, then we can transmit multiple signals simultaneously over a single channel, all using different frequency ranges. Another reason to modulate a signal is to allow the use of a smaller antenna.
What are the two main types of modulation techniques?
These modulation techniques are classified into two major types: analog and digital or pulse modulation.
What is modulation in GPS?
Neither amplitude nor frequency modulation are used in GPS. It is the alteration of the phases of the carrier waves that encodes them. It is phase modulation that allows them to carry the codes from the satellites to the receivers.
What is BPSK modulation technique?
Binary Phase-shift keying (BPSK) is a digital modulation scheme that conveys data by changing, or modulating, two different phase s of a reference signal (the carrier wave ). The constellation points chosen are usually positioned with uniform angular spacing around a circle.
Which modulation is used in satellite communication Mcq?
Microwaves are used for satellite communication since the lower bands get reflected by the ionosphere. 8.
What type of modulation is used on voice and video signals?
In Television transmission, FM is used for audio transmission and AM is used for video transmission. Analog television system uses Vestigial Side band (VSB) for modulation.
What are types of modulation?
There are three types of Modulation:
- Amplitude Modulation.
- Frequency Modulation.
- Phase Modulation.
What is digital modulation technique?
Digital modulation is the process of encoding a digital information signal into the amplitude, phase, or frequency of the transmitted signal. In general, a modulation technique encodes several bits into one symbol, and the rate of symbol transmission determines the bandwidth of the transmitted signal.
How are modulation techniques used in satellite communications?
Focuses on modulation techniques for modern satellite communications from generating and analyzing the signals to the impacts of phase noise on modulation quality.
Which is better digital modulation or analogue modulation?
As the advance in technology and limitation of analogue modulation it is now most of the satellite using digital modulation techniques and providing some advantages over analogue modulation like better performance, error detection and correction efficiency, signal to noise ratio etc.
What are the different types of modulation techniques?
Modulation techniques are roughly divided into four types: Analog modulation, Digital modulation, Pulse modulation, and Spread spectrum method.
What are the advantages of using a satellite?
Communications via satellites have two unique characteristics: the ability to cover the globe with a flexibility that cannot be duplicated with terrestrial links, and the availability of large bandwidth for intercontinental communications. Modulation is the process of converting data into electrical signals optimized for transmission.