We consider monitoring applications in multihop wireless sensor networks (WSNs), where nodes rely on limited batteries so that energy efficiency and reliability are of paramount importance. Typically, lossy compression is aimed at saving transmission energy, yet affects the quality of transmitted data over lossy channels. Accordingly, using error correction coding (ECC) along with compression is required to guarantee both energy efficiency and high-fidelity reconstruction. In this paper, we analyze the energy efficiency of the joint use of lossy compression along with ECC, with the twofold objective of extending the network lifetime and assuring reliability. Specifically, we consider an adaptive joint lossy source-channel coding (JLSCC) system, where the energy efficiency and reliability performances depend on both the compression and the coding rates. Therein, we first carry out a performance analysis of JLSCC, considering realistic models of communication and computational energies, when the communication is performed over a Rayleigh fading channel. Then, we evaluate the performance of the JLSCC system compared to lossy compression and ECC systems in both end-to-end and multihop communications. Our results reveal that an adaptive JLSCC results in substantial energy saving while guaranteeing the required reliability performance, compared to both lossy compression and channel coding systems, that cannot be efficient for both energy and reliability. Instead, the JLSCC system is proved to be energy efficient for small distance end-to-end communication and large-scale multihop network, while leading to satisfactory reliability performance.

中文翻译：

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多跳物联网网络的自适应联合有损源信道编码

我们考虑在多跳无线传感器网络（WSN）中监视应用程序，其中节点依赖有限的电池，因此能源效率和可靠性至关重要。通常，有损压缩旨在节省传输能量，但会影响有损信道上传输数据的质量。因此，需要同时使用纠错编码（ECC）和压缩功能，以确保能效和高保真重建。在本文中，我们分析了联合使用有损压缩和ECC的能效，目的是延长网络寿命并确保可靠性。具体来说，我们考虑一种自适应联合有损源信道编码（JLSCC）系统，能量效率和可靠性性能取决于压缩率和编码率。其中，当在瑞利衰落信道上执行通信时，我们首先考虑通信和计算能量的实际模型，对JLSCC进行性能分析。然后，在端到端和多跳通信中，我们将JLSCC系统的性能与有损压缩和ECC系统进行了比较。我们的研究结果表明，与有损压缩和信道编码系统相比，自适应JLSCC既节省了能源，又能保证所需的可靠性，而能源和可靠性均无法高效实现。相反，事实证明，JLSCC系统对于小距离端到端通信和大规模多跳网络是节能的，