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Design of a DVB-T/H COFDM Receiver for Portable Video Applications

Mobile video services have generated a lot of interest recently. To reach a cost-effective solution, design trade-offs among system performance, hardware complexity, and power consumption must be considered in the early design phase of such applications.

In this article, we present a system overview, simulation platform, and hardware design of a DVB-T/H baseband receiver. Starting with a design platform, several algorithms on both inner and outer receivers are developed to meet target system performance under different channels.

Then, system architecture and related key modules are explored, taking into account both silicon area and power consumption. Finally, several design issues related to the integration of the proposed DVB-T/H inner and outer receivers are addressed.

INTRODUCTION:

To provide digital video services on handheld terminals in a mobile environment, the terminal devices must be customized for better mobility and battery-life usage. Nowadays, several orthogonal frequency-division multiplexing (OFDM)-based standards are designed for such applications and will share this market.

These standards are terrestrial digital multimedia broadcasting (T-DMB), integrated services digital broadcasting-terrestrial (ISDB-T), digital video broadcast-handheld (DVB-H), and mediaFLO. The T-DMB is based on a digital audio broadcasting (DAB) system and improves the error correction part of a DAB system.

The ISDB-T is a band-segmented transmission (BST) OFDM-based system that consists of a set of common basic frequency blocks. The mediaFLO and DVB-H use the coded orthogonal frequency division multiplexing (COFDM) modulation method. Some comparisons and survey work were recently reported.

The DVB-H system, enhanced from the digital video broadcasting-terrestrial (DVB-T) broadcasting system, is proposed for such environments. In addition, because of provided data rates in DVB-H services and the small-size displays of typical handheld devices, video coding methods, such as H.264/AVC (advanced video coding) and other high-efficiency video-coding standards are proposed.
Source: SI2 Lab
Authors: Lei-Fone Chen | Chen-Yi Le

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