Abstract
In this paper, we consider partial path selection (PPS) for a multi-hop decode-and-forward cooperative system with limited channel state information (CSI) feedback, where the PPS utilizes local CSI only for a subset of hops on each of all independent paths between a source and a destination to reduce the energy consumption for CSI feedback. To enhance the end-to-end performance of the PPS, we propose a novel PPS method with local CSI chosen by the correlation between the end-to-end signal-to-noise ratios (SNRs) based on global and local CSI under Nakagami-m fading channels. For each path, we pick a subset of hops to report CSI with the highest correlation for a given CSI feedback overhead requirement, which can achieve the similar end-to-end outage probability to the best path selection with global CSI. We provide an exact and closed-form expression for the SNR correlation coefficient and present an impact of the SNR correlation on the end-to-end outage probability.
Highlights
Wireless sensor networks (WSNs) have the advantages of high flexibility in deployment and high usability in dynamic environments [1,2]
To minimize the performance degradation relative to the best path selection (BPS) based on the global channel state information (CSI), we introduce the correlation coefficient between the end-to-end signal-to-noise ratios (SNRs) calculated by global and local CSI for each path, and find the subset of hops for local CSI in each path that maximizes the correlation coefficient
We show the relationship between the SNR correlation coefficient and the end-to-end outage probability of partial path selection (PPS) and find certain channel conditions in order that the PPS with the highest SNR correlation coefficient achieves the similar performance to the BPS
Summary
Wireless sensor networks (WSNs) have the advantages of high flexibility in deployment and high usability in dynamic environments [1,2]. The concept of virtual antennas has been employed to generate and exploit more spatial diversity, where multiple cooperative nodes are regarded as virtual antennas of a transmitter or a receiver Such virtual antennas have been adopted in multi-hop WSNs so as to improve their signal reliability and data rate [8,9,10]. The exact and closed-form expression for the end-to-end outage probability of PPS with local CSI in Nakagami-m fading channels is derived to evaluate the end-to-end performance of PPS based on the SNR correlation coefficient.
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