What is DVB S2 8PSK?
DVB-S2 is the second-generation specification for satellite broadcasting – developed by the DVB (Digital Video Broadcasting) Project in 2003. It benefits from more recent developments in channel coding (LDPC codes) combined with a variety of modulation formats (QPSK, 8PSK, 16APSK and 32APSK).
What Apsk 32?
The 32-APSK modulation constellation is composed of three concentric rings of uniformly spaced 4, 12, and 16 PSK points, respectively in the inner ring (R1), the intermediate ring (R2), and the outer ring (R3). DVB signals have periodic Pi/2 BPSK.
How do you calculate FEC?
Forward error correction is applied to the customer’s information data at the transmit end. so transmission data rate = customer information rate x 1/ (FEC rate). FEC rate is typically in the range 1/2 to 7/8 so the transmission data rate is always significantly more than the customer information rate.
Which modulation technique is most susceptible to noise?
Amplitude modulation
Amplitude modulation methods like ASK/OOK and QAM are far more susceptible to noise so they have a higher BER for a given modulation.
What is the difference between DVB-S and DVB-S2?
DVB-S2 is able to achieve about a 30% increase in spectral performance compared to the original DVB-S. This allows for an increase in bit rate over the same DVB-S frequency bandwidth. DVB-S2 increases TV satellite spectral performance by about 30%! DVB-S2 was formally published as an ETSI standard in 2005.
What is DVB-S2 standard?
DVB-S2 defines a “second generation” modulation and channel coding system for a very flexible standard, covering a variety of applications by satellite. DVB‑S2 is compatible with Moving Pictures Experts Group (MPEG‑2 and MPEG‑4) coded TV services, with a Transport Stream packet multiplex.
What does Apsk stand for?
Amplitude and phase-shift keying (APSK) is a digital modulation scheme that conveys data by modulating both the amplitude and the phase of a carrier wave. In other words, it combines both amplitude-shift keying (ASK) and phase-shift keying (PSK).
Why is FEC coding required?
To maintain high throughput or avoid significantly increasing link rate the code rate needs to be high. To compensate channel loss or relax signal to noise ratio (SNR) or bit error rate (BER) requirements at decision slicers in the receiver a large coding gain is desirable.