Abstract
Network coding is able to address output conflicts when fanout splitting is allowed for multicast switching. Hence, it successfully achieves a larger rate region than non-coding approaches in crossbar switches. However, network coding requires large coding buffers and a high computational cost on encoding and decoding. In this paper, we propose a novel Online Network Coding framework called Online NC for multicast switches, which is adaptive to constrained buffers. Moreover, it enjoys a much lower decoding complexity O(n 2) by a Vandermonde matrix based approach, as compared to conventional randomized network coding O(n 3). Our approach realizes online coding with one coding algorithm that synchronizes buffering and coding. Therefore, we significantly reduce requirements on buffer space, while also sustaining high throughputs. We confirm the superior advantages of our contributions using empirical studies.
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