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In this paper, we investigate channel allocation for cooperative relays in cognitive radio networks. Different from conventional cooperative relay channels, cognitive radio relay channels are actually a combination of three kinds of channels: direct, dual-hop, and relay channels, which belong to different spectrum bands and provide parallel end-to-end transmission. In order to maximize the achievable...
Adaptive modulation and coding schemes (MCS) are key components in the next generation wireless system to improve channel throughput by adaptively choosing the MCS according to channel states. However, due to channel feedback delay, processing delay, and scheduling delay, the channel state may change at the time of transmission and results in channel capacity loss. Simply using previous channel state...
We propose a novel rate control algorithm for real-time video transmission over wireless systems, which encompass power control technique, region-based rate control strategy and a macroblock-based segmentation method. By allocating more power as well as more bits to the regions of interest of a video frame and less power & fewer bits to the rest regions, the algorithm improves the visual quality...
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