ABSTRACT

A novel UEP (Unequal Error Protection) method is proposed that utilizes the subcarrier positions relative to pilot subcarriers in an OFDM multicarrier frame along with QAM (Quadrature Amplitude Modulation) schemes. With the available physical layer techniques, a prioritized encoding strategy based on the characteristics of the channel fading effects on the proximity data subcarriers to the pilot subcarriers for layered video is developed. The strategy is to efficiently map the bit streams of various priorities into the subcarriers with assisted info on their individual error recovery probability. The proposed technology maintains a minimum QoS for all periods outside outage since the high priority layer is guaranteed to be transmitted under BER constraints. At lower SNR scenarios this difference between the pilot proximate subcarriers are more distinctive.