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
  • Feedstock: In space and astronautical engineering, feedstock refers to the raw materials or resources that are used to produce propellants, fuels, and other consumables necessary for space missions. These materials can include gases, liquids, and soli ... Read More >>
  • Hazard: In space and astronautical engineering, a hazard refers to any condition or situation that poses a threat to the safety or success of a mission. Hazards can be natural, such as radiation, micrometeoroids, and extreme temperatures, or they c ... Read More >>
  • Globe Valves: Globe valves are linear motion valves that are primarily used to regulate fluid flow in a pipeline. They consist of a movable disk-type element and a stationary ring seat in a spherical body. The disk is connected to a stem which is operate ... Read More >>
Top News

Bestselling author explains the science of happiness: "You can do the work"...

Bestselling author and Harvard professor Arthur Brooks opens up about how enjoyment, satisfaction and meaning in life can increase a person's wellbeing....

News Source: CBS News on 2024-11-18

November's full moon, known as the Beaver Moon, is the last supermoon of 2024. H...

November's full moon, known as the Beaver Moon, is the last supermoon of 2024. Here's when it peaks and why it's called the Beaver Moon....

News Source: CBS News on 2024-11-15

You can't put a price on the sense of awe particle physics inspires...

Astronomy and particle physics are no longer seen as vital by the US establishment, so funding has fallen. But our work creates a sense of wonder, and wonder matters, says Chanda Prescod-Weinstein...

News Source: New Scientist on 2024-11-13

If you want to stretch your gift game into days this holiday, check out these ad...

The advent calendar phenomenon is growing every year, with so many exciting, fun, beautiful, and delicious options available...

News Source: ABC News on 2024-11-04

November brings a bonanza of meteor showers...

November brings a skywatching bonanza, with three meteor showers — the Southern Taurids, Northern Taurids and Orionids — offering chances to see shooting stars....

News Source: NBC News on 2024-11-02