Title :
Outage Analysis of Superposition-Modulation-Aided Network-Coded Cooperation in the Presence of Network Coding Noise
Author :
Bo Zhang ; Jie Hu ; Ying Huang ; El-Hajjar, Mohammed ; Hanzo, Lajos
Author_Institution :
Sch. of Electron. & Comput. Sci., Univ. of Southampton, Southampton, UK
Abstract :
We consider a network, where multiple source-destination (S-D) pairs communicate with the aid of a half-duplex relay node (RN), which adopts decode-and-forward (DF) relaying and superposition modulation (SPM) for combining the signals transmitted by the source nodes (SNs) and then forwards the composite signal to all the destination nodes (DNs). Each DN extracts the signals transmitted by its own SN from the composite signal by subtracting the signals overheard from the unwanted SNs. We derive tight lower bounds for the outage probability for transmission over Rayleigh fading channels and invoke diversity combining (DC) at the DNs, which is validated by simulation for both the symmetric and the asymmetric network configurations. For the high signal-to-noise ratio regime, we derive both an upper bound and a lower bound for the outage performance and analyze the achievable diversity gain. It is revealed that a diversity order of 2 is achieved, regardless of the number of SN-DN pairs in the network. We also highlight the fact that the outage performance is dominated by the quality of the worst overheated link because it contributes most substantially to the network coding (NC) noise. Finally, we use the lower bound for designing a relay selection scheme for the proposed SPM-based network-coded cooperative communication (SPM-NC-CC) system.
Keywords :
Rayleigh channels; cooperative communication; decode and forward communication; diversity reception; network coding; probability; relay networks (telecommunication); Rayleigh fading channels; SN-DN pairs; SPM-based network-coded cooperative communication system; asymmetric network configurations; composite signal; decode-and-forward relaying; destination nodes; diversity combining; diversity gain; half-duplex relay node; high signal-to-noise ratio regime; multiple source-destination pairs; network coding noise; outage analysis; outage probability; relay selection scheme; source nodes; superposition-modulation-aided network-coded cooperation; worst overheated link; Diversity reception; Educational institutions; Network coding; Relays; Signal to noise ratio; Tin; Cooperative communications (CC); decode-and- forward (DF); network coding (NC); outage analysis; superpostion modulation (SPM);
Journal_Title :
Vehicular Technology, IEEE Transactions on
DOI :
10.1109/TVT.2014.2322074