Outage probability of unequal block-based OFDM Amplify-and-Forward relay protocol over wideband channels

In this paper, we consider a dual-hop multiple-relay network with orthogonal frequency division multiplexing (OFDM) based Amplify-and-Forward (AF) relay protocol over frequency-selective channels. In practice, subcarriers suffered that suffer deep fade in one relay may have good channels available f...

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Bibliographic Details
Main Authors: Sileh, I. K., Wei Xiang, Alajel, K. M.
Format: Conference Proceeding
Language:English
Subjects:
Fading
OFDM
outage probability
Protocols
Relays
selective relaying
Signal to noise ratio
Simulation
Wireless communication
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Summary:In this paper, we consider a dual-hop multiple-relay network with orthogonal frequency division multiplexing (OFDM) based Amplify-and-Forward (AF) relay protocol over frequency-selective channels. In practice, subcarriers suffered that suffer deep fade in one relay may have good channels available for another relay. Therefore, each relay can support a different number of subcarriers. We propose an unequal block-based OFDM-AF relaying scheme. In our scheme, an OFDM symbol is divided into unequal blocks of subcarriers at its destination. The destination assigns each relay a corresponding number of subcarriers depending on the signal-to-noise ratio (SNR) of the signals. We derive a closed form expression of the probability of outage and this gives the general expression for our protocol and selective OFDM, OFDMA, and block-OFDM schemes. results show that the scheme achieves a better performance for a given number of blocks than the selective block-OFDM protocol.
DOI:10.1109/ISCIT.2012.6380970