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We propose and experimentally demonstrate a novel channel-independent multi-band orthogonal circulant matrix transform (MB-OCT) precoding, to efficiently combat the severe frequency-selective fading induced by the limited modulation bandwidth of visible light communication (VLC). The proposed MB-OCT precoding exhibits ladder-like signal-to-noise-ratio (SNR) profile, thus significant BER reduction...
In this paper, different PAPR reduction schemes for orthogonal frequency division multiplexing (OFDM) based visible light communication (VLC) system are experimentally investigated. We show that PAPR reduction may not always result in performance improvement in VLC systems. Compared to the linear selective mapping (SLM) precoding scheme, the nonlinear companding schemes, albeit providing larger PAPR...
The increasingly amount of virtual scenes and multimedia data have been the major problems in developing a virtual navigation system. Designers of virtual navigation system need to consider whether the massive data would influence the smoothness of navigation to users, and whether the efficiency of server would be decreased sharply when multiple users are online at the same time. In order to solve...
Adaptive PI rate control protocol (API-RCP) has been proposed as an explicit congestion control mechanism. In this paper, a Linux-based testbed is created to validate the features and performance of API-RCP. Various issues on implementing API-RCP in Linux kernel are addressed. There are two outcomes of our experimental results: a) Confirm that in practice API-RCP is as effective as the theory asserts...
Theoretical analysis and experiments have shown that TCP can become oscillatory and prone to instability in high bandwidth-delay-product networks. XCP was proposed to overcome these shortcomings by advertising an explicit window adjustment from the routers to the sources. However, XCP may under-utilize the bandwidth in a multi-bottleneck network and cause some flows to receive an arbitrarily small...
TCP is widely implemented for congestion control in current IP networks. As the network bandwidth increases, TCP becomes oscillatory and prone to instability, regardless of the queuing scheme. As a rate-based control scheme, XCP was proposed to obtain high link utilization in high bandwidth-delay product networks, while maintaining small queue size in the routers. XCP explicit feedbacks the congestion...
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