The purpose of this laboratory exercise is to obtain overview of the block structure of encoder/decoder and modulator/demodulator in systems DVB-H/SH and DVB-S2/C2/T2.
BER (Bit Error Ratio) before a nd Viterbi decoding (DVB-H), after turbo decoding (DVB-SH) and before and after LDPC decoding (DVB-S2/C2/T2) as well as after all error corrections is examined during simulated transmission.
These parameters illuminate the purpose of functional blocks and influence of their settings on resulting errors in the DVB-H/SH/S2/C2/T2 transmissions.
DVB-H (Digital Video Broadcasting –Handheld) is a technical specification for the transmission of digital TV to handheld receivers such as mobile telephones and PDAs and was formally adopted as ETSI standard EN 302 304.
DVB-H has been developed from the DVB-T (Terrestrial) standard. Thank to the FEC (Forward Error Correction), which is used in DVB-H system, the transmission is much easier in unfavorable conditions (mobile and portable scenarios).
Depending on the currently transmission scenario (multipath propagation, Doppler’s shift), DVB-H system allows wide possibilities of parameter settings for the needs of requirements for service operator:
• 3 possibilities of modulation (QPSK, 16QAM, 64QAM)
• 5 different FEC rates (1/2, 2/3, 3/4, 5/6, 7/8)
• 4 possibilities of guard interval (1/32, 1/16, 1/8, 1/4)
• 3 OFDM carrier modes 2k (1705), 4k (3409) a 8k (6817)
• 3 possible channel bandwidth (8, 7, 6, 5) MHz
• Hierarchical/non-hierarchical modulation
• Native / In-depth (In-Depth) interleaving.
Source: Aalborg University
Authors: Zena Fourzoli | Radwan Charafeddine