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This paper is based on the idea of exploiting the discrete constellation alphabets in linear precoding for the downlink of MultiUser (MU) MIMO. The authors study the effect of discrete constellation inputs on the sum rate of different linear pre-coders while confining ourselves to the case of two single antenna users. They show that contrary to the case of Gaussian alphabets where altruistic solutions as interference cancellation (Channel Inversion - CI) and interference attenuation (Regularized Channel Inversion - RCI) are the recommended strategies for linear precoding, it is beneficial not to attenuate or cancel the MU interference, if it is coming from discrete constellations.
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