  The present paper proposes a novel transmission strategy, referred to as
cocktail BPSK, whereat two independent BPSKs are superposed with the
non-orthogonal basis in a parallel transmission. In contrast to the
conventional signal superpositions, the proposed scheme avoids the interference
between the two symbols, allows the symbol-energy-reuse of each other and gains
the extra energy. Based on the formulation of the mutual informations, the
theoretical analysis shows that the cocktail BPSK scheme can achieve high data
rate beyond the channel capacity at very low SNR, and the numerical results
confirm this approach eventually.
