Upcoming Events
20 November
A Hybrid Relaying Protocol for the Parallel-Relay Network
Speaker: Samantha Summerson
Friday, November 20, 2009
9:00 AM to 10:00 AM
3076 Duncan Hall
Cooperation among radios in wireless networks has been shown to improve communication in several aspects. We analyze a wireless network which employs multiple parallel relay transceivers to assist in communication between a single source-destination pair, demonstrating that gains are achieved when a random subset of relays is selected. We derive threshold values for the received signal-to-noise ratios (SNRs) at the relays based on outage probabilities; these thresholds essentially determine the active subset of relays in each time frame for our parallel relay network; due the random nature of wireless channels, this active subset is a random. Two established forwarding protocols for the relays, Amplify-and-Forward and Decode-and-Forward, are combined to create a hybrid relaying protocol. Two coding schemes, regenerative coding and distributed space-time coding, are analyzed with the hybrid relaying protocol and the efficient allocation of power resources for the relays is considered for both perfect feedback to the relays from the destination and no feedback. For a low SNR regime, we find gains in both achievable rate and probability of outage over existing protocols for the parallel relay network.
Friday, November 20, 2009
9:00 AM to 10:00 AM
3076 Duncan Hall
Cooperation among radios in wireless networks has been shown to improve communication in several aspects. We analyze a wireless network which employs multiple parallel relay transceivers to assist in communication between a single source-destination pair, demonstrating that gains are achieved when a random subset of relays is selected. We derive threshold values for the received signal-to-noise ratios (SNRs) at the relays based on outage probabilities; these thresholds essentially determine the active subset of relays in each time frame for our parallel relay network; due the random nature of wireless channels, this active subset is a random. Two established forwarding protocols for the relays, Amplify-and-Forward and Decode-and-Forward, are combined to create a hybrid relaying protocol. Two coding schemes, regenerative coding and distributed space-time coding, are analyzed with the hybrid relaying protocol and the efficient allocation of power resources for the relays is considered for both perfect feedback to the relays from the destination and no feedback. For a low SNR regime, we find gains in both achievable rate and probability of outage over existing protocols for the parallel relay network.