Analysis and Performance Comparison of DVB-T and DTMB Systems for Terrestrial Digital TV

TL;DR

This paper compares DVB-T and DTMB digital TV systems, analyzing their BER performance, spectrum use, and power efficiency across various channel conditions, revealing their relative strengths and weaknesses.

Contribution

It provides a comprehensive performance comparison of DVB-T and DTMB systems under different channel scenarios, highlighting their respective advantages.

Findings

DVB-T outperforms DTMB in Gaussian and Ricean channels at the same guard interval.

DTMB performs better in Rayleigh channels with higher code rates and modulation orders.

Both systems have similar overall performance, with specific strengths depending on channel conditions.

Abstract

Orthogonal frequency-division multiplexing (OFDM) is the most popular transmission technology in digital terrestrial broadcasting (DTTB), adopted by many DTTB standards. In this paper, the bit error rate (BER) performance of two DTTB systems, namely cyclic prefix OFDM (CP-OFDM) based DVB-T and time domain synchronous OFDM (TDS-OFDM) based DTMB, is evaluated in different channel conditions. Spectrum utilization and power efficiency are also discussed to demonstrate the transmission overhead of both systems. Simulation results show that the performances of the two systems are much close. Given the same ratio of guard interval (GI), the DVB-T outperforms DTMB in terms of signal to noise ratio (SNR) in Gaussian and Ricean channels, while DTMB behaves better performance in Rayleigh channel in higher code rates and higher orders of constellation thanks to its efficient channel coding and interleaving scheme.