QoE-driven cross-layer optimized video transmission scheme over MIMO-OFDM systems

摘要

In wireless communication systems, the combination of multiple-input multiple-output (MIMO) with orthogonal frequency division multiplexing (OFDM) is regarded as one promising techniques to support high data rate and high performance. In such a situation, wireless multimedia services have spread widely over MIMO-OFDM systems. How to provide user-satisfied multimedia services over MIMO-OFDM systems has attracted increasingly attentions. Quality of experience (QoE) is the key criteria for evaluating users' satisfaction with multimedia services in terms of mean opinion score (MOS). In this paper, we propose a QoE-driven cross-layer optimized video transmission scheme over MIMO-OFDM systems. No-reference QoE estimation model is applied to acquire the expected MOS taking account of video content type (CT), frame rate (FR), video sending bit rate (SBR) and packet error rate (PER). The aim of our proposed scheme is to achieve user-satisfied video quality by jointly optimizing video coding parameters at the application layer and modulation and coding scheme (MCS) at the physical layer. The problem is formulated to find the optimal combination of parameters to maximize expected MOS with constraint of maximum transmission delay, and solved by improved traversal algorithm. Experimental results have shown significant performance enhancement of the proposed system based on H.264/AVC and NS2.