Amplitude-shift keying (ASK) is a form of amplitude modulation that represents digital data as variations in the amplitude of a carrier wave. In an ASK system, the binary symbol 1 is represented by transmitting a fixed-amplitude carrier wave and fixed frequency for a bit duration of T seconds. If the signal value is 1 then the carrier signal will be transmitted; otherwise, a signal value of 0 will be transmitted.

Any digital modulation scheme uses a finite number of distinct signals to represent digital data. ASK uses a finite number of ampl ....etc

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VMSK(very minimum shift keying modulation) ,for very minimum shift keying modulation, is one of the ultra narrow band modulation (UNBM) methods claimed to send high speed digital data through very low bandwidth (or narrowband) channels. ....etc

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The bit error rate (BER) expressions of 16-phase shifting (PSK) and 16-quadrature amplitude modulation (QAM) are obtained analytically in the presence of a phase error. By averaging over the phase error statistics, the performance penalty can be analyzed analytically as a function of the phase error variance. Phase error variations leading to a signal-to-noise ratio of 1 dB per bit penalty at BER = 10 (-4) have been found 8.7 x 10 (-2) rad (2), 1.2 x Rad (2), 2.4 x 10 (-3) rad (2), 6.0 x 10 (-4) rad (2) and 2.3 x 10 (-3) rad (2) ) For binary, q ....etc

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Sometimes in some communication networks,a process needs to securely exchange messages with its neighboring processes. In this case, one or more symmetric keys are utilised to encrypt each mnessage. These symmetric keys are are shared only between two processes:- The reciever process that recieves the message and the sender process that semds the message. Assigning assign each process a seperate key O(d) is a way, where d is the maximum number of neighbors of any process in the communication network under cconsideration. a more efficient sc ....etc

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GMSK:
Gaussian Filtered Minimum Shift Keying
Gina Colangelo
EE194 - SDR
Topics
Background
Minimum Shift Keying (MSK)
Gaussian Filtering
Spectral Efficiency GMSK vs. MSK
Common Applications
Introduction
Digital modulation schemes are becoming increasingly important in wireless communication systems.
Using an unfiltered binary data stream to modulate an RF carrier will produce an RF spectrum of considerable bandwidth.
Techniques have been developed to minimize this bandwidth, improve spectral performance, and ease detection.
Back ....etc

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10 viva questions and answers about amplitude shift keying

Amplitude-shift keying (ASK) is a form of amplitude modulation that represents digital data as variations in the amplitude of a carrier wave. In an ASK system, the binary symbol 1 is represented by transmitting a fixed-amplitude carrier wave and fixed frequency for a bit duration of T seconds. If the signal value is 1 then the carrier signal will be transmitted; otherwise, a signal value of 0 will be transmitted.

Any digital modulation scheme uses a finite number of distinct signals t ....etc

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A Technique for Orthogonal Frequency Division Multiplexing
Frequency Offset Correction

Abstract:
The Orthogonal Frequency Division Multiplexing (OFDM) is a Multi Carrier Modulation technique employing Frequency Division Multiplexing of orthogonal subcarriers. It is also sometimes called as discrete multitone modulation (DMT). It is better than CDMA in high bit rate and Broadband Communications .It is a multi carrier technique, which is very sensitive to Frequency Offset between transmitter and receiver. Th ....etc

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Abstract:
frequency shift keying (FSK) is a method for representing digital data with analog signals by using a change in the frequency of the carrier to represent information. It is thus a type of modulation. FSK with two frequencies, corresponding to the digital values 0 and 1 (see diagram) is the primary method used by low-speed modems.FSK is a low performance type of digital modulation. Binary FSK is a form of constant amplitude angle modulation, ....etc

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Virtual Energy-Based Encryption and Keying for Wireless Sensor Networks



Designing cost-efficient, secure network protocols for Wireless Sensor Networks (WSNs) is a challenging problem because sensors are resource-limited wireless devices. Since the communication cost is the most dominant factor in a sensor s energy consumption. RAPIDLY developed WSN technology is no longer nascent and will be used in a variety of application scenarios. Typical application areas include environmental, military, and commercial enter ....etc

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Design a digital transmission system using PSK for the transmission and reception of
text messages. ....etc

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