Abstract
In this paper, we propose a novel buffer-state-based (BSB) non-orthogonal multiple access (NOMA)-aided downlink scheme for a two-hop cooperative network supporting multiple relay and destination nodes. More specifically, in the broadcast phase, the source node broadcasts information packets to multiple selected relay nodes. In the relaying phase, a selected relay node transmits packets to multiple destination nodes based on the NOMA principle. Here, the use of buffer at the relay nodes allows us to achieve a flexible relay selection. Furthermore, with the aid of buffer-state-based relay selection, the detrimental effects of empty- and full-buffer states are avoided. The theoretical outage probability and average packet delay are derived for our proposed scheme, based on the Markov-chain model. Our simulation results demonstrate that the proposed scheme outperforms the existing max-link and BSB relay selection benchmarks.
Highlights
The cooperative communications [1], [2] allow us to mitigate the detrimental effects of the propagation loss and multipath induced fading
As mentioned above, the novel contribution of this paper is that we propose a bufferaided cooperative non-orthogonal multiple access (NOMA) downlink with a relay selection algorithm based on generalized buffer-statebased (GBSB) protocol [11]
PERFORMANCE RESULTS we present our simulation results in order to evaluate the achievable performance of the proposed scheme, which is compared with the max-link protocol [5] and the BSB protocol [6]
Summary
The cooperative communications [1], [2] allow us to mitigate the detrimental effects of the propagation loss and multipath induced fading. In [6], the max-link protocol was extended to buffer-statebased (BSB) relay selection for the sake of avoiding a buffer overflow as well as an empty buffer This allows us to attain a lower average packet delay and a better outage probability than the max-link counterpart. In [8], the simultaneous use of multiple source-to-relay (SR) links was proposed for reducing the packet delay, which is achievable by exploiting the broadcast nature of wireless channels Inspired by both the protocols of [8] and [6], the generalized buffer-statebased (GBSB) relay selection protocol was proposed in [11]. In order to improve the achievable performance, the concept mentioned above of buffer-aided relay selection was incorporated into the cooperative NOMA systems in the two-user scenario [26]–[30].
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