Adaptive overall qos maximizing multicast video streaming system over wireless network

This paper presents an adaptive overall QoS maximizing multicast video streaming system over wireless network. While a conventional logical superposition modulation scheme generates symbols using a pre-determined modulation combination to overcome wireless channel uncertainty of subscribers, the ALSPM dynamically selects a modulation combination according to time-varying wireless channel conditions of subscribers. As a result, the ALSPM can increase the overall network throughput. However, the ALSPM occurs video quality degradation due to the wireless channel fluctuation. For this reason, the proposed system employs fountain codes and adjusts its code rate to guarantee successful decoding in probability. In addition, fountain encoded H.264 two-layer SVC video streams are effectively mapped to the selected logical superposition modulation combination to support better streaming video quality. Finally, experimental results are provided to demonstrate the performance of the proposed system.