Adaptive Modulation

Adaptive Modulation is a technique used in communication systems to dynamically adjust the modulation scheme and/or coding rate of a transmitted signal based on the channel conditions. The goal of adaptive modulation is to maximize the data rate while maintaining an acceptable level of bit error rate (BER) or packet error rate (PER). In space and astronautical engineering, adaptive modulation is particularly important for satellite communication systems, where the channel conditions can vary significantly due to factors such as atmospheric attenuation, rain fade, and satellite motion. Adaptive modulation can be implemented using various algorithms, such as the Channel Quality Indicator (CQI) feedback mechanism, which allows the receiver to inform the transmitter about the channel conditions. Other techniques include the use of pilot signals, which are used to estimate the channel quality, and the use of multiple-input multiple-output (MIMO) systems, which can improve the channel capacity by using multiple antennas.
Your Previous Searches
Random Picks
  • Attitude: In space and astronautical engineering, attitude refers to the orientation of a spacecraft or satellite with respect to a reference frame. Attitude can be described by three angles, known as Euler angles, which define the spacecraft's orien ... Read More >>
  • Gamma-ray Imaging: Gamma-ray imaging is a technique used in space and astronautical engineering to detect and image gamma rays emitted by celestial objects. Gamma rays are the most energetic form of electromagnetic radiation and are produced by high-energy pr ... Read More >>
  • Muscle And Bone Mass Maintenance: Muscle and bone mass maintenance refers to the preservation of muscle and bone tissue in the microgravity environment of space. In the absence of gravity, astronauts experience a decrease in muscle and bone mass due to the lack of weight-be ... Read More >>
Top News

Orionids meteor shower is this weekend: Where and when to watch its peak...

Orionids meteor shower is this weekend: Where and when to watch its peakgo.com...

News Source: ABC News on 2024-10-18

Acting or hosting, Travis Kelce wants to continue to pursue a showbiz career. Bu...

Travis Kelce is the host of “Are You Smarter Than a Celebrity?”...

News Source: ABC News on 2024-10-09

Now is a great time to see Saturn in all its ringed glory...

My first sight of Saturn through a telescope inspired my love of space. Dig out your telescopes or visit your local astronomy club, and you may be lucky enough to spot our sixth planet's stunning thic...

News Source: New Scientist on 2024-10-09

Was Bruce Willis right? Could a nuclear blast save us from killer asteroid?...

Scientists simulated a nuclear explosion using x-ray pulses to push an asteroid-like rock away in space-like conditions....

News Source: Al Jazeera English on 2024-10-04

China's answer to SpaceX's Starlink is also threatening astronomy...

The first 18 satellites of a planned Chinese mega constellation are brighter than all but 500 stars in the sky, raising fears of a huge impact on astronomy...

News Source: New Scientist on 2024-10-03