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Non-orthogonal multiple access (NOMA) is a promising multiple access technique for future wireless communications as it results in high spectral efficiency. NOMA differs from recently adopted orthogonal multiple access techniques in that it superimposes multiple data flows at the same time and same frequency band but with different power levels, and resorts to the successive interference cancellation...
Cooperative communication is a promising method to mitigate fading, achieve high spectrum efficiency and improve transmission capacity for wireless networks by means of spatial diversity. Recently increasing research is focused on cooperative medium access control (MAC) design to make full use of diversity gain. A relay-contention-free cooperative MAC (RCF-CMAC) protocol is proposed for wireless networks...
Cooperative communication is proved to effectively mitigate fading, achieve high spectrum efficiency and improve transmission capacity for wireless networks by means of spatial diversity. Recently increasing work is extended to cooperative medium access control (MAC) protocol design. A relay preselection and contention-based cooperative MAC (RPCB-CMAC) protocol is proposed to alleviate the negative...
Multi-hop is widely used in wireless sensor networks to deliver packets; however, biased energy consumption rate (BECR) always happens when using this delivery method. BECR can cause energy hole and isolate some nodes, which would decrease the connectivity of the wireless sensor networks, and reduce nodes' sensor effectiveness and network lifetime. Hence, we propose a scheme named potential-based...
The multiple-access relay channel (MARC) based on network coding, typically with two sources, one relay, and one destination, has been proposed in recent papers as an approach to achieve diversity gain in wireless networks and reduce the number of transmissions by the relay node. However, conventional network-coding-based MARC scheme wastes the channel resource because the relay forwards the signal...
Quantum key distribution (QKD) networks have recently attracted growing attention. The topology of the local QKD network is the basis of the next-generation global secure communication network. In this letter, we report a realization of a wavelength-routing star type QKD network which can span a metropolis using a commercial backbone optical fiber network without trusted relays. The longest and the...
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