Satellite Communication

Carrier Sense Multiple Access (CSMA)

CSMA an acronym used for Carrier Sense Multiple Access. It is a type of random-access protocol, where multiple stations transmit their data over a shared channel. However, before transmission, each station senses the channel first and transmits only when finds the channel idle. In CSMA, each station is equally prioritized and thus the transmission occurs …

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Hamming Codes

Hamming Codes are linear block codes designed to detect and correct errors introduced in message bits transmitted from an end to another through a communication channel. These are single error-correcting codes that offer ease in encoding and decoding. Hamming Code falls under the category of error correction coding and is a type of cyclic code. …

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Cyclic Code

Cyclic Code is known to be a subclass of linear block codes where cyclic shift in the bits of the codeword results in another codeword. It is quite important as it offers easy implementation and thus finds applications in various systems. Cyclic codes are widely used in satellite communication as the information sent digitally is …

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ALOHA Protocol

ALOHA Protocol is a type of random-access protocol that allows simultaneous transmission of data frames by multiple stations over a common communication channel. This protocol is a simple communication technique where each individual station that is a part of the network holds equal priority and operates independently. Some other names for ALOHA protocol are ALOHA system …

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Concatenated Code

Concatenated Codes is a type of error-correcting code formed by the series combinations of two or even more codes to form a complex one. By this approach, a long length code is produced that increases the randomness thereby increasing the encryption ability. This facilitates more secured data communication. Basically, the word ‘concatenation’ is used in …

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Convolutional Code

Convolutional code is another type of error-correcting code where the output bits are obtained by performing a desired logical operation on a present bitstream along with considering some bits of the previous stream. This coding technique rather than depending on the block of bits shows dependency on bitstream. It is also a linear code that …

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Linear Block Code

Linear block code is a type of error-correcting code in which the actual information bits are linearly combined with the parity check bits so as to generate a linear codeword that is transmitted through the channel. Another major type of error-correcting code is convolution code. In the linear block code technique, the complete message is …

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Earth Segment

The earth segment in the satellite communication system consists of earth stations (earth terminals) with their respective equipment, circuits and various links to the terrestrial network. Earth stations are a major part of the earth segment and can be of fixed or mobile nature. Earth stations are structurally quite complex as it includes the necessary …

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Space Segment

The space segment is known to be another crucial aspect of satellite communication systems other than the control and user segment. The space segment undoubtedly includes satellites however it also comprises the ground-based units that help to maintain the operationality of satellites orbiting the earth. The space segment is designed to receive, store and retransmit …

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