English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

This letter studies distributed opportunistic channel access in a wirelessnetwork with decode-and-forward relays. All the sources use channel contentionto get transmission opportunity. If a source wins the contention, the channelstate information in the first-hop channel (from the source to its relay) isestimated, and a decision is made for the winner source to either give up thetransmission opportunity and let all sources start a new contention, ortransmit to the relay. Once the relay gets the traffic, it may have a sequenceof probings of the second-hop channel (from the relay to the destination).After each probing, if the second-hop channel is good enough, the relaytransmits to the destination and completes the transmission process of thesource; otherwise, the relay decides either to give up and let all sourcesstart a new contention, or to continue to probe the second-hop channel. Theoptimal decision strategies for the two hops are derived in this letter. Thefirst-hop strategy is a pure-threshold strategy, i.e., when the first-hopchannel signal-to-noise ratio (SNR) is more than a threshold, the winner sourceshould transmit to the relay, and subsequently the second-hop strategy shouldlet the relay keep probing the second-hop channel until a good enoughsecond-hop channel is observed. Simulation results show that our scheme isbeneficial when the second-hop channels have larger average SNR.

Opportunistic Cooperative Channel Access in Distributed Wireless Networks with Decode-and-Forward Relays