Adaptive Logical Superposition Modulation and H.264 SVC based Video Streaming Multicast over WiMAX Network

Abstract

In this paper, we present an adaptive logical superposition modulation system considering mobility and distribution of subscribers. Since existing logical superposition modulation systems transmit OFDM symbols to subscribers using fixed modulation schemes without considering time-varying channel condition of subscribers, it achieves a lower network throughput compared to adaptive modulation and coding scheme. The proposed adaptive logical superposition modulation accurately estimates time-varying wireless channel condition by using Kalman filter and Channel Quality Information of subscribers. According to the information, it dynamically chooses modulation schemes to maximize total network throughput of subscribers. And H.264 two-layer SVC video stream data are mapped to the proposed superposition modulation to improve streaming video quality. Finally experimental results are provided to show the performance of the proposed system.