Channel Monitor-Based Unequal Error Protection Scheme Using Dynamic OFDM Subcarrier Assignment Technique for Broadband Video Transmission System

摘要

This paper proposes a channel monitor-based unequal error protection scheme using a dynamic OFDM sub-carrier assignment technique for broadband video transmission systems in frequency selective fading environments. In the proposed system, to achieve stable regeneration of the received video, subcarricrs with relatively high channel gain are assigned to the high priority data (HPD) in the MPEG data. To further guarantee a required transmission quality of the HPD, the proposed system also employs subcarrier transmission power control with delay profile information (DPI) feedback-type channel estimation technique. Computer simulation confirms that the proposed technique is effective in preventing quality degradation with about 20 dB lower transmission power than the conventional systems in frequency selective fading environments.