Capacity analysis and blind signals separation method of WSDM system under multiple sources condition

Wireless statistic division multiplexing (WSDM) is a multiplexing scheme that transmits multiple signals simultaneously in the same frequency band over wireless channels. Based on the capacity of WSDM system when sources are just two, we extend the WSDM system model and analyze the capacity under multiple sources condition. Computer simulations show that WSDM method can raise the bandwidth efficiency greatly. What's more, how to separate time-frequency mixed signals in WSDM system with multiple sources is a difficult problem. We propose optimal linear separation method by applying Rayleigh quotient scheme. The closed form expression of separating matrix is derived according to the proposed method. Computer simulations also verify the proposed method is feasible and perform better than independent component analysis (ICA) method.