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LDPC codes functionally are defined by a sparse parity-check matrix. This sparse matrix is often randomly generated, subject to the sparsity constraints—LDPC code construction is discussed later. These codes were first designed by Robert Gallager in 1960. Below is a graph fragment of an example LDPC code using Forney's factor graph notation.
A radioisotope thermoelectric generator ( RTG, RITEG ), sometimes referred to as a radioisotope power system (RPS), is a type of nuclear battery that uses an array of thermocouples to convert the heat released by the decay of a suitable radioactive material into electricity by the Seebeck effect. This type of generator has no moving parts and ...
The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; the pattern of position detection was found and determined by applying the least-used ratio (1:1:3:1:1) in black ...
Droop speed control is a control mode used for AC electrical power generators, whereby the power output of a generator reduces as the line frequency increases. It is commonly used as the speed control mode of the governor of a prime mover driving a synchronous generator connected to an electrical grid. It works by controlling the rate of power ...
The raised-cosine filter is a filter frequently used for pulse-shaping in digital modulation due to its ability to minimise intersymbol interference (ISI). Its name stems from the fact that the non-zero portion of the frequency spectrum of its simplest form ( ) is a cosine function, 'raised' up to sit above the (horizontal) axis.
At the conclusion of its fourth rate-setting policy meeting of 2024 on June 12, 2024, the Federal Reserve kept the federal funds target interest rate steady at a 23-year high of 5.25% to 5.50% ...
Slave states and free states. An animation showing the free/slave status of U.S. states and territories, 1789–1861 (see separate yearly maps below). The American Civil War began in 1861. The 13th Amendment, effective December 6, 1865, abolished slavery in the U.S. In the United States before 1865, a slave state was a state in which slavery ...
Motley Fool Transcribing, The Motley Fool. July 3, 2024 at 2:15 PM. Logo of jester cap with thought bubble. Image source: The Motley Fool. Constellation Brands (NYSE: STZ) Q1 2025 Earnings Call ...