Abstract
In this paper, we focus on the design of a reliable communication scheme for generic 5-node wireless butterfly networks (WBN). Since the WBN represents a natural extension of the basic two-way relay communication channel, we follow the paradigm of Wireless Physical Layer Network Coding and we show that the design of novel adaptive constellations is desirable to exploit the promising performance of wireless network coding in WBN. We introduce a systematic constellation design algorithm, and we show that the proposed constellations are capable of outperforming conventional point-to-point modulations in WBN over the whole range of channel signal to noise ratios. To further support the applicability of the proposed constellations in a practical system, we integrate a simple binary channel coding scheme, providing a robust adaptive modulation and coding scheme for relaying in symmetric WBNs with arbitrary channel conditions.
Highlights
The invention of Wireless Network Coding (WNC) has provided a means for a significant enhancement in wireless system performance [1,2,3]
One of the first attempts to design a suitable multisource constellation for communication in a multi-node WNC system was introduced in our previous work [11], where the adaptive 2-source constellations for WNCbased communication in a 5-node wireless butterfly network (WBN) were developed
4.3 Uncoded system throughput To analyze the performance of the proposed constellations, we evaluate the throughput for fixed γMAC and γBC as a function of γHSI
Summary
The invention of Wireless Network Coding (WNC) has provided a means for a significant enhancement in wireless system performance [1,2,3]. One of the first attempts to design a suitable multisource constellation for communication in a multi-node WNC system was introduced in our previous work [11], where the adaptive 2-source constellations for WNCbased communication in a 5-node wireless butterfly network (WBN) were developed. 3. We validate the proposed design in a real-world hardware (HW) setup, including the HW evaluation of adaptive system performance. 4. We show how the channel coding can be integrated into the proposed constellation design, including the analysis of proper source transmission rates. 5. We evaluate numerically the performance of the resulting adaptive modulation and coding scheme for a wide range of channel conditions in the WBN.
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