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What is FEC in satellite?
Forward Error Correction (FEC) is a technique used for controlling errors in data transmission, FEC is accomplished by adding redundancy to the transmitted information using a predetermined algorithm. Part of the data stream is used solely to correct errors in the downlink stream from the satellite.
What is FEC in communication?
In communication systems, information theory, and coding theory, forward error correction (FEC) is a technique used for controlling errors in data transmission over unreliable or noisy communication channels.
Why QPSK is used in satellite communication?
In one such approach, quadrature phase-shift-keying (QPSK) modulation provides both spectral and power efficiency. In a QPSK modulator, two data streams simultaneously modulate a carrier signal. For optimum use of available satellite power, an unbalanced QPSK (UQPSK) modulator is often used.
What are the various types of error-correcting techniques?
There are three major types of error correction.
- Automatic repeat request (ARQ)
- Forward error correction.
- Hybrid schemes.
- Minimum distance coding.
- Repetition codes.
- Parity bit.
- Checksum.
- Cyclic redundancy check.
Is there a low error rate for FEC?
Single-pass decoding with this family of error correction codes can yield very low error rates, but for long-range transmission conditions (like deep space) iterative decoding is recommended.
Which is FEC code for mobile broadcast standards?
On upper layers, FEC solution for mobile broadcast standards is Raptor code or RaptorQ. Most forward error correction corrects only bit-flips, but not bit-insertions or bit-deletions. In this setting, the Hamming distance is the appropriate way to measure the bit error rate.
What does a FEC of 9 / 10 mean?
A FEC of 9/10 means that just one-tenth of the data is used to correct errors, making the signal harder to receive and much less robust. It will break up more easily in weak signal areas, or when subjected to interference. For the broadcaster, 9/10 means that more channels can be squeezed in, at a higher data rate.