Abstract
In this paper, we investigate the performance of a detector recently proposed by us that is applied in the relay station receiving signals from two terminals concurrently exchanging data in the two-way relaying system. This is one of the potential configurations to save resources in fifth-generation systems, similar to non-orthogonal multiple access, which is also considered for such systems. Two-way relaying can be implemented using physical network coding. This technique originates from the network coding idea, in which network nodes can perform some mathematical operations. The idea of the investigated detector lies in the application of tentative decisions about weaker signals in the detection of stronger ones and then, after improved detection of stronger user signals, achieving more reliable decisions about the weaker ones. We compare the performance of the proposed detector with the performance of a detector in which the relay makes decisions on the data symbols received from the stations participating in two-way relaying on a symbol-by-symbol basis. Simulation results performed for two-way relaying with physical network coding reported in this paper confirm the superiority of the proposed detector when compared with the standard physical network coding solution applied in the relay node.
Highlights
Fifth-generation systems (5G) are in the phase of intensive development some crucial decisions on their structure, architecture, and form of physical, medium access control, and network layers have already been made and have received the form of standards [1,2]
As the main contribution of our research is the investigation of the decision-making based on two received packets in the physical layer at the relay node, in our research we limit ourselves to relatively simple convolutional codes applied for orthogonal frequency division multiplexing (OFDM) transmission, which are typical for the WiFi IEEE 802.11 family of standards, including 802.11a/g/n/ac and ax
The general conclusion is that if any of the analyzed physical layer network coding (PNC) receivers is applied, aiming to receive the same receive power of the signals received from both terminals is not the best strategy
Summary
Fifth-generation systems (5G) are in the phase of intensive development some crucial decisions on their structure, architecture, and form of physical, medium access control, and network layers have already been made and have received the form of standards [1,2]. The authors analyze the so-called separate decoding detector, in which the relay detects the codewords received from each node separately They consider two versions of a joint channel decoding and network coding detector (regular and generalized one), which determines the codewords being the sum of the codewords transmitted by both end nodes. The authors consider improving performance with a combination of successive cancellation, digital network coding, and opportunistic relay selection in a two-way cooperative scheme, in which two source nodes send their packets to each other via multiple relaying nodes. As the main contribution of our research is the investigation of the decision-making based on two received packets in the physical layer at the relay node, in our research we limit ourselves to relatively simple convolutional codes applied for orthogonal frequency division multiplexing (OFDM) transmission, which are typical for the WiFi IEEE 802.11 family of standards, including 802.11a/g/n/ac and ax. We believe that the conclusions drawn from our results can be extended to more advanced coding systems
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