Abstract
We evaluate the outage probability and the energy efficiency (EE) of a network composed of multiple sources, multiple relays and a single common destination, all of them provided with multiple antennas. More specifically, we resort to the network-coded cooperative (NCC) technique with multiple relay selection (MRS) and compare the EE of the network when operating under two combining techniques at the receiver, namely selection combining (SC) and maximum ratio combining (MRC). Our analysis, which adopts a realistic energy consumption model that encompasses the circuitry consumption, shows that MRC, which is optimal from the reliability perspective, may be outperformed by SC in terms of EE. Moreover, we also provide some insights about the number of relays that must be selected to maximize the EE. Finally, numerical results are presented and confirm the mathematical analysis.
Highlights
With the advent of the Internet-of-Things (IoT), there has been an increasing interest in Wireless Sensor Networks (WSNs) [1]
We obtain the outage probability of the network-coded cooperative (NCC) scheme from [11] when operating under the selection combining (SC) technique at the receiver side, and considering that the source nodes are provided with multiple antennas;. We show that it may be more advantageous from an EE perspective to adopt the SC scheme at the receiver rather maximum ratio combining (MRC), the latter is known to be the optimal solution in terms of reliability;
Unless stated otherwise, the parameters adopted are presented in Table 4, which are in accordance to [2], [18]
Summary
With the advent of the Internet-of-Things (IoT), there has been an increasing interest in Wireless Sensor Networks (WSNs) [1] In these networks, a set of spatially distributed end-devices (EDs) are usually responsible for gathering some information and transmitting to a common sink. We evaluate the EE of the NCC scheme with MRS from [11], when operating under the MRC technique at the receivers as in [11], and with the less complex SC technique This is aligned with lowcomplexity hardware networks where the devices are provided with just one radio frequency (RF) chain such as IEEE 802.15.4 based networks [20]. We obtain the outage probability of the NCC scheme from [11] when operating under the SC technique at the receiver side, and considering that the source nodes are provided with multiple antennas;. Notation: The symbols and acronyms adopted in this work are summarized in Table 1 and Table 2, respectively
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