UEP Based on Proximity Pilot Subcarriers in OFDM
A novel Unequal-Error-Protection method is proposed that utilizes the subcarrier positions relative to pilot subcarriers in an OFDM multicarrier frame. With the available physical layer techniques, a prioritized encoding strategy based on the characteristics of the channel fading effects on the data subcarriers, those are in close proximity 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 information 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.