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Conventional wireless video multicast schemes face a challenge due to their stair-shaped performance curves called “cliff effect” and the limited ability to accommodate multiple users with diverse channel conditions. Recently, a series of analog video coding approaches aiming to solve the problem have been proposed. In this paper, our goal is to enhance such schemes through a novel cross-layer design...
Dynamic Adaptive Streaming over HTTP (DASH), as one of the main video transmission technologies, has been widely concerned. However, due to the unstability of wireless environment and the restrictions of mobile networks, it is challenging to deliver DASH-based videos in LTE systems and enhance the performance of Quality of Experience (QoE). In this paper, a problem is formulated to maximize the sum...
We consider designing a distributed scheduling algorithm for multi-homing users in heterogeneous cache-enabled small cell networks. The aim is to minimize the total operation cost on condition that all users' QoS requirements are satisfied. The proposed algorithm is based on alternating direction method of multipliers (ADMM) and can be carried out in each small cell base station (SCBS) independently...
Uncompressed video transmission has recently attracted research attentions because it ensures low end-to-end latency, high video quality and low complexity. In this paper, we propose a real-time uncompressed video transmission system, where unequal power allocation (UPA) strategies are adopted to minimize the end-to-end mean square error (MSE). Specifically, the relationship between the bit error...
In this paper, a hierarchical modulation scheme is applied to IEEE 802.11n to reach the purpose of unequal error protection (UEP). A simplified method of data partition is proposed for intra- and inter-predicted videos which are encoded by H.264/AVC. Simulation results show that the PSNR of compressed video can be improved through this hierarchical modulation scheme by about 4 ~ 8 dB on both AWGN...
Selective relaying periodically selects one single relay with the best channel quality to participate the communication between source and destination. When OFDM is used as the physical layer technique in the network, a new problem is how to select the best relay since independent subcarriers may have different channel conditions. Several schemes have been presented, while their capacities are still...
By using a single relay with best channel quality for cooperative diversity, opportunistic relaying achieves the same diversity gain as that achieved by more complex space-time coding. However, the failure probability of the best relay selection may become unacceptable when the number of relays increases. We propose a modified practical best relay selection scheme in this paper. The source is required...
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