Virtual Signal Decomposition based Multi-User Communication

With the ever-increasing number of users’ concurrent data transmissions in communication systems, co-channel interference (CCI) has become a key impediment to the improvement of the multi-user system’s capacity. Current multi-user communication schemes based on signal processing mitigate CCI by adjusting interfering signals. However, such methods may lead to the degradation of the performance of data transmissions carried in the adjusted signals. In this paper, we propose a Virtual Signal Decomposition (VSD) based multi-user communication (MUC) method by exploiting the interactions among multiple wireless signals. This approach employs a reconciling transmitter (Tx) that sends a reconciling signal (which can be virtually decomposed into multiple components) to interact with the interfering signal components received at the common receiver (Rx). This way, the Rx can recover multiple orthogonal desired signals without interference. The proposed method can not only avoid the desired transmission’s quality degradation incurred by the adjustment of the transmitted signal at the Tx, but also prevent the problem of the desired signal’s power loss at the common Rx while suppressing interference. We also present two various implementations of VSD based on the orthogonal and non-orthogonal decomposition of the reconciling signal. Our simulation results demonstrate that the proposed methods can significantly improve the spectral efficiency (SE) of the multi-user communication system.