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The field of the coded modulations witnessed its golden era as the simulatedachievable bit rates (ABRs) were getting close to the channel capacities of thefinite alphabet inputs. However, when working at a single channel, the previousresearches are mostly restricted in scope of single input and single output. Incontrast, for achieving higher spectral efficiency, the present authors proposea method that builds upon the parallel transmission of two signals that areseparated at the receiver. The signal separation is enabled by, so called, thedouble mapping modulation working through Hamming- to Euclidean space.Consequently, the ABR summation of the two signals is found higher the channelcapacity of BPSK input. Both the theoretical- and simulation result confirmthis approach.

A Signal Separation Method for Exceeding the Channel Capacity of BPSK Input