permutation modulation - определение. Что такое permutation modulation
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Что (кто) такое permutation modulation - определение

Random Permutation Statistics; Permutation statistic; Permutation statistics; Random permutation statistic

Modulation         
  • A low-frequency message signal (top) may be carried by an AM or FM radio wave.
  • Categorization for signal modulation based on data and carrier types
  • [[Waterfall plot]] of a 146.52 MHz radio carrier, with amplitude modulation by a 1,000 Hz sinusoid. Two strong sidebands at + and - 1 kHz from the carrier frequency are shown.
  •  A carrier, frequency modulated by a 1,000 Hz sinusoid. The [[modulation index]] has been adjusted to around 2.4, so the carrier frequency has small amplitude. Several strong sidebands are apparent; in principle an infinite number are produced in FM but the higher-order sidebands are of negligible magnitude.
PROCESS OF ENCODING INFORMATION BY VARYING PROPERTIES OF A PERIODIC CARRIER WAVEFORM
Modulator; Modulated; Mode of transmission; Pulse modulation; Shift keying; Digital modulation; Pulse Modulation; Modulation (communications); Demod; Periodic current reversal; Pulse modulator; Multi Carrier Modulation; Analog modulation; Modulating signal; Modulation memory; Analog modulation method; Digital modulation method; Digital Modem; Modulated wave; Pulse modulation methods; Pulse time modulation; Automatic digital modulation recognition; Digital carrier modulation; Analog carrier modulation
In electronics and telecommunications, modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a separate signal called the modulation signal that typically contains information to be transmitted. For example, the modulation signal might be an audio signal representing sound from a microphone, a video signal representing moving images from a video camera, or a digital signal representing a sequence of binary digits, a bitstream from a computer.
Modulated         
  • A low-frequency message signal (top) may be carried by an AM or FM radio wave.
  • Categorization for signal modulation based on data and carrier types
  • [[Waterfall plot]] of a 146.52 MHz radio carrier, with amplitude modulation by a 1,000 Hz sinusoid. Two strong sidebands at + and - 1 kHz from the carrier frequency are shown.
  •  A carrier, frequency modulated by a 1,000 Hz sinusoid. The [[modulation index]] has been adjusted to around 2.4, so the carrier frequency has small amplitude. Several strong sidebands are apparent; in principle an infinite number are produced in FM but the higher-order sidebands are of negligible magnitude.
PROCESS OF ENCODING INFORMATION BY VARYING PROPERTIES OF A PERIODIC CARRIER WAVEFORM
Modulator; Modulated; Mode of transmission; Pulse modulation; Shift keying; Digital modulation; Pulse Modulation; Modulation (communications); Demod; Periodic current reversal; Pulse modulator; Multi Carrier Modulation; Analog modulation; Modulating signal; Modulation memory; Analog modulation method; Digital modulation method; Digital Modem; Modulated wave; Pulse modulation methods; Pulse time modulation; Automatic digital modulation recognition; Digital carrier modulation; Analog carrier modulation
·Impf & ·p.p. of Modulate.
Modulator         
  • A low-frequency message signal (top) may be carried by an AM or FM radio wave.
  • Categorization for signal modulation based on data and carrier types
  • [[Waterfall plot]] of a 146.52 MHz radio carrier, with amplitude modulation by a 1,000 Hz sinusoid. Two strong sidebands at + and - 1 kHz from the carrier frequency are shown.
  •  A carrier, frequency modulated by a 1,000 Hz sinusoid. The [[modulation index]] has been adjusted to around 2.4, so the carrier frequency has small amplitude. Several strong sidebands are apparent; in principle an infinite number are produced in FM but the higher-order sidebands are of negligible magnitude.
PROCESS OF ENCODING INFORMATION BY VARYING PROPERTIES OF A PERIODIC CARRIER WAVEFORM
Modulator; Modulated; Mode of transmission; Pulse modulation; Shift keying; Digital modulation; Pulse Modulation; Modulation (communications); Demod; Periodic current reversal; Pulse modulator; Multi Carrier Modulation; Analog modulation; Modulating signal; Modulation memory; Analog modulation method; Digital modulation method; Digital Modem; Modulated wave; Pulse modulation methods; Pulse time modulation; Automatic digital modulation recognition; Digital carrier modulation; Analog carrier modulation
·noun One who, or that which, modulates.

Википедия

Random permutation statistics

The statistics of random permutations, such as the cycle structure of a random permutation are of fundamental importance in the analysis of algorithms, especially of sorting algorithms, which operate on random permutations. Suppose, for example, that we are using quickselect (a cousin of quicksort) to select a random element of a random permutation. Quickselect will perform a partial sort on the array, as it partitions the array according to the pivot. Hence a permutation will be less disordered after quickselect has been performed. The amount of disorder that remains may be analysed with generating functions. These generating functions depend in a fundamental way on the generating functions of random permutation statistics. Hence it is of vital importance to compute these generating functions.

The article on random permutations contains an introduction to random permutations.