Abstract
The selection of a relay in a cooperative network is usually based on signal-to-noise ratio (SNR). In a situation where the SNR is low due to Rayleigh fading, the receiver signal may show a sudden loss. Such signal loss may result in significant loss of information at the receiver and it is the duration of such a loss period that will most significantly cause channel and source coding to fail. To avoid such a phenomenon in relay selection, it is important to compute second-order statistics and select relays based on fade duration (FD), both average fade duration (AFD) and the probability that a fade duration will exceed a threshold. This paper provides algorithms for AFD-based and FD threshold-based relay selection in multiple and single hop cooperative wireless networks. It also shows how to increase the reliability of the network by minimizing the average fade duration.
Highlights
The desire of mobile users for high quality wireless connections imposes tremendous pressure on a wireless service provider to improve the service quality
The separate average fade duration (AFD), fade duration outage probability (FDOP), and signal-to-noise ratio (SNR) tables show each parameter from source nodes to relays, between relay nodes, and from relays to the destination
We have shown in previous sections that fade duration (AFD or FDOP) based methods have the best correlation with the performance expected by end users
Summary
The desire of mobile users for high quality wireless connections imposes tremendous pressure on a wireless service provider to improve the service quality. Previous works on selection of relays have placed little emphasis on the fade duration as a relay selection criteria This is unfortunate because fade duration may have the biggest effect on user experience and the performance of channel and source coding. Relay selection based on the average fade duration (AFD) over Raleigh faded channels is presented. Proposal of cooperative relay techniques among source and destination pairs through one or two designated relays (i.e, two or three hop relay paths) to improve the received signal. Usage of the fade duration outage probability (FDOP) technique to analyze the quality of each end-to-end path and to apply the optimization method to select a designated relay. Proposal of relay selection based on the average fade duration (AFD) method.
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