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DVB-S2 is designed for broadcast services including standard and HDTV, interactive services including Internet access, and (professional) data content distribution. The development of DVB-S2 coincided with the introduction of HDTV and H.264 (MPEG-4 AVC) video codecs. Two new key features that were added compared to the DVB-S standard are:
DVB-S2X increased efficiency up to 51% over DVB-S2. [4] Improvements include: Higher order modulation schemes (64/128/256APSK) Smaller roll-off factors of 5%, 10% and 15%; Improved filtering enabling smaller carrier spacing; Channel bonding in order to combine several carriers, increasing efficiency in 'Direct-To-Home' (DTH) applications
ETSI DVB-S/S2; DVB-S TR 101 198 V1.1.1 (09/97) Implementation of Binary Phase Shift Keying (BPSK) modulation in DVB satellite transmission systems; DVB-S EN 300 421 V1.1.2 (08/97) Framing structure, channel coding and modulation for 11/12 GHz satellite services; Irdeto history
Also unlike DVB, all DSS receivers are proprietary DirecTV reception units. DirecTV is now using a modified version of DVB-S2, the latest version of the DVB-S protocol, for HDTV services off the SPACEWAY-1, SPACEWAY-2, DirecTV-10 and DirecTV-11 [2] satellites; however, huge numbers of DSS encoded channels still remain. The ACM modulation scheme ...
Platform HD. Transponder #84; Frequency: 12,380 MHz Polarization: Vertical (V) Transmission standard: DVB-S2 Modulation: 8PSK Symbol rate: 26,400 FEC: 2/3 ...
The resilience of APSK to amplifier and channel non-linearities afforded by its low PAPR have made it especially attractive for satellite communications, including DVB-S2. [3] A modified constellation diagram of 16-APSK. Typically 16-APSK will have 15 degree phase offset on the outer ring, which is not depicted here.
For example: The Reed-Solomon code with LDPC Coded Modulation (RS-LCM) uses a Reed-Solomon outer code. [18] The DVB-S2, the DVB-T2 and the DVB-C2 standards all use a BCH code outer code to mop up residual errors after LDPC decoding. [19] 5G NR uses polar code for the control channels and LDPC for the data channels. [20] [21]
A 19 kHz pilot tone is also added at a 9% modulation to trigger radios to decode the stereo subcarrier, making FM stereo fully compatible with mono. Once the receiver demodulates the L+R and L−R signals, it adds the two signals ([L+R] + [L−R] = 2L) to get the left channel and subtracts ([L+R] − [L−R] = 2R) to get the right channel.