A study of DVB-T2 standard with physical layer transceiver design and implementation

Abstract

The second generation of terrestrial digital video broadcasting (DVB-T2) standard was published by European Telecommunications Standards Institute in 2008. Compared with the previous DVB-T, the new standard offers better robustness to severe channel conditions and provides up to 60% data capacity increment. These performance improvements are achieved through the adoption of new channel coding and modulation techniques.

This thesis concentrates on the physical layer transceiver of DVB-T2, including bit-interleaved coded modulation (BICM) module, frame mapper module, and orthogonal-frequency-division-multiplexing (OFDM) modulation module. We established a baseband physical layer DVB-T2 system model and thoroughly studied new techniques included in the transmitter and their receiving methods, including Bose-Chaudhuri-Hocquenghemand (BCH) codes, low-density parity{u00AD}check (LDPC) codes, iterative BICM with rotated constellation, P1 preamble OFDM symbol, and two OFDM peak-to-average power ratio (PAPR) reduction techniques. We then proposed some techniques for transceiver optimization. The main outcomes are:

1. an efficient BCH encoding/decoding algorithm;

2. a low-complexity iterative demapping and decoding algorithm;

3. novel time domain synchronization and decoding methods for P1 OFDM symbol;

4. a novel low-complexity time domain channel estimation method for normal OFDM symbol.

Each transceiver module was first implemented and had their performance evaluated separately. Then they were assembled to investigate the end-to-end bit-error-rate (BER) performance of the complete baseband physical layer DVB-T2 transceiver. Simulated channel types are additive white Gaussian noise (AWGN) channel, multipath Ricean fading channel, multipath Rayleigh fading channel and multipath mobile channel. The correctness of our system was confirmed by comparing the simulation results with the performance reported in the official implementation guidelines published by digital video broadcasting (DVB) group. Show more