Abstract: To solve problems of node decoding failure caused by multi-stream interference in wireless communication networks and low resource utilization ratio, a physical layer network code aware routing scheme with payload balancing is proposed in multi-stream wireless networks. According to the time-varying characteristics of wireless networks, it uses two processes of routing request and response, and analyzes the relative positions of nodes in space to perform a reasonable selection of network topology. The scheme uses the relative spatial position between nodes to reasonably select the network topology, calculate the dynamic data distribution ratio, and reduce the congestion of intermediate nodes. A new routing metric based on bit error rate (BER) calculation is proposed to expand the scope of code-aware routing based on solving multi-stream interference. The simulation shows that when the BER is 10-4, network state information-aware physical layer network coding routing scheme against multi-stream interference compared with the coding opportunity entity (COPE) schemes, the proposed scheme reduces the required signal-to-noise ratio (SNR) by about 6%, compared with the COPE scheme, the proposed scheme reduces the expected transmissions count metric (ETX) of the required physical layer by 0.25 times under the same BER. Therefore, the scheme can be used in the space-ground integration network (SGIN) under multi-stream interference.

Key words: network state information, multi-stream wireless networks, expected transmission count, opportunistic physical layer network coded routing, outage probability