Novel multihop transmission schemes using selective network coding and differential modulation for two-way relay networks

Abstract

In this paper, we propose a novel multihop transmission scheme using selective network coding (NC) and differential modulation (SNC-DM) for two-way relay networks (TWRNs) when neither the source nodes nor the relay nodes know the channel state information (CSI). We first develop a bidirectional transmission scheme using NC where the information exchange in a two-way multihop relay network with the arbitrary number of hops can be completed in four transmission phases. As a result, the maximum achievable throughput does not decrease as the number of hops increases. To overcome the error propagation in the multihop transmission with decode-and-forward (DF) protocol in wireless fading channels, a selective NC scheme is proposed. In addition, we apply differential modulation in the proposed scheme to avoid channel estimation in the multihop networks. The performance of the proposed scheme is analyzed, and a closedform frame error rate (FER) expression is derived. It is shown that the proposed scheme achieves significant improvements in both FER performance and network throughput compared to the conventional multihop DF scheme in TWRNs. The analytical results are verified through numerical simulations.

A survey on unmanned aerial vehicle relaying networks

“…Some existing studies have focused on the two‐way multi‐hop transmission design based on general relays in the literature. [20] proposed a DF‐based multi‐hop transmission scheme with asymptotic transmission rate up to , where the asymptotic transmission rate is further increased to in [26]. The outage probability of AF‐based multi‐hop transmission was analyzed in [57].…”

“…Figure 6 illustrates the system throughput of different UAV relaying schemes under different periods with average transmission power of UAV dBm and dBm. For the UAV relaying protocol, an efficient four‐time‐slot two‐way multi‐UAV relaying protocol in [26] is referred to, which can work on any number of intermediate UAVs in the UAV‐assisted two‐way multi‐hop relaying system. The number of UAVs as relay nodes is set as .…”

Multi‐hop delay reduction for safety‐related message broadcasting in vehicle‐to‐vehicle communications

“…Most of these works got the hop count by counting beacons or resorting to simulations. In [14], the authors proposed a novel multi-hop transmission scheme, which used selective network coding and differential modulation in two-way relay networks. In [15], there was a counter of beacons for average hop count.…”

“…Noted that in (14) the one-hop delay is associated with p. Therefore we can find the relationship between the one-hop transmission range R and the average one-hop delay E[D o ] through the following equation 3.4 Multi-hop delay By using (1), (7) and (13), the average multi-hop delay can be written as follows, while satisfying the connectivity probability…”

Source and physical‐layer network coding for correlated two‐way relaying

“…Network coding (NC) has been known as an efficient technique to significantly increase the capacity of communication networks [1][2][3]. Recently, it has been applied to improve the transmission efficiency of two-way relay networks (TWRNs) [4,5]. In [6,7], a three time slot (TS) NC scheme based on decode-and-forward protocol was first introduced to TWRNs.…”