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In broadcasting field, the company has been selected as gap filter developmental company in satellite DMB project proceeded in SK in 2003. Thus, the company develops, supplies, installs, and operates signal processor of gap filter until today. In addition, instrument to test gap filter using GATT(Gap Filler Analyzer and Terminal Tester) is being supplied to SKT as well.
In ground-wave broadcasting filed, Exciter for ATSC and ACU is developed with self-owned technology and supplied to local broadcasting stations including KBS.
DVB-T2 is the second generation digital TV system that is extention of DVB-T - conventional European TV standard.
It adopts the OFDM modulation scheme and transmits the broadcast signal after BCH/LDPC channel coding.
It is noise-resistant than traditional method and increases the transfer efficiency about 30% Because it disperses the transmission traffic through multiple physical layer pipes.
| Function | DVB-T | DVB-T2 |
|---|---|---|
| FEC | Convolutional Coding+Reed Solomon 1/2, 2/3, 3/4, 5/6, 7/8 |
LDPC+BCH with 1/2, 3/5, 2/3, 3/4, 4/5, 5/6 |
| Modulation Mode | QPSK, 16QAM, 64QAM | QPSK, 16QAM, 64QAM, 256QAM |
| Guard Interval | 1/4, 1/8, 1/16, 1/32 | 1/4, 19/128, 1/8, 19/256, 1/16, 1/32, 1/128 |
| FFT Size | 2k, 8k | 1K, 2K, 4K, 8K, 16K, 32K |
| Scattered Pilots | 8% of total | 1%, 2%, 4%, 8% of total |
| Continual Pilots | 2.6% of total | 0.35% of total |
| Bandwidth | 6, 7, 8MHz | 1.7, 5, 6, 7, 8, 10MHz |
| Typical data rate | 24Mbit/s | 40 Mbit/s |
| Required C/N ratio | 16.7dB | 8.9dB |
