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Guarding against channel errors in wireless networks has been a challenging research problem, specially when transmitting time-constrained contents, like streaming video or image. Source diversity in the form of Multiple Description Coding (MDC) has been studied for guarding against wireless channel errors. In MDC, an image is broken into several equally important descriptions which can be sent over...
This paper addresses a fundamental trade-off between rate and the diversity gain of an end-to-end connection in an erasure network. The erasure network is modeled by a directed graph whose links are orthogonal erasure channels. Furthermore, the erasure network is assumed to be non-ergodic, meaning that the erasure status of the links are assumed to be fixed during each block of transmission and change...
We consider the problem of cross-layer utility maximization subject to stability constraints for a multi-commodity wireless network where all links are sharing a number of orthogonal channels. We assume a time slotted network, where the channel gains are changing randomly from slot to slot. The optimal cross-layer network control policy can be decomposed into three subproblems: 1) flow control at...
Recently, opportunistic routing has been proposed to take good advantage of broadcast nature and spatial diversity to achieve high throughput, despite highly unpredictable and lossy wireless links in multi-hop wireless networks. Most previous works provide heuristic solutions to select as many candidates, and don't take inter-candidate delivery probability into account, which might suffer acknowledgement...
Recent advances in wireless technology have made it increasingly feasible to equip wireless nodes with multiple radios, thereby allowing each radio to exploit channel diversity in the form of orthogonal, non-overlapping transmission spectrums. Multi-channel operation mitigates interference, but at the same time raises new challenges for network optimization, in terms of judicious channel assignment...
In this paper, we propose a path metric called multi-radio achievable bandwidth (MPvAB) to accurately capture the impacts of inter/intra-flow interferences and space/channel diversity along a path. We consider a practical scenario that an end-to-end path may consist of both multi-radio hops and single-radio hops, where different channels do not interfere with each other but interferences exist within...
Recent research has proven that network coding has great potential to improve network throughput in wireless networks. To fully exploit the performance gain brought by network coding, coding-aware routing has been studied to proactively change route of flows for creating more coding opportunities. However, in today's multi-rate wireless networks, coding may not be a wise decision as the lowest rate...
With low usage of physical and application flow characterizations, current WMN architecture couldn't make full use of the network capacity. Compared with conventional multi-hop wireless networks, nodes in wireless mesh networks (WMNs) are with diversity. However, current protocols for WMNs does not consider these characterizations. In order to improve the throughput of WMNs, this paper proposes a...
Multipath fading greatly degrades system performance of wireless networks. Conventionally diversity is introduced to mitigate fading. In this paper we study space diversity in multi-hop wireless networks under power constraints. Point-to-point links are extended to group-to-group virtual MIMO links. Then we propose a cross-layer design of MAC and routing that exploits opportunistic cooperation and...
The design of a routing protocol must be based on the characteristics of its target networks. The diversity of wireless networks motivates the design of different routing metrics, capturing different aspects of wireless communications. The design of routing metrics, however, is not arbitrary since it has a great impact on the proper operation of routing protocols. Combining a wrong type of routing...
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