Fundamentals of wireless communication
Fundamentals of wireless communication
Elements of Information Theory (Wiley Series in Telecommunications and Signal Processing)
Elements of Information Theory (Wiley Series in Telecommunications and Signal Processing)
The worst additive noise under a covariance constraint
IEEE Transactions on Information Theory
Optimized transmission for fading multiple-access and broadcast channels with multiple antennas
IEEE Journal on Selected Areas in Communications
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The applicability of the gap approximation is investigated in the context of Gaussian multi-user channels where suboptimal transmission schemes are employed. In this case, the assumption of all users being subject to Gaussian interference may not always hold. Considering the two-user Multiple Access Channel as an example, and assuming uncoded Pulse Amplitude Modulation (PAM), it is shown that the gap approximation can be used, albeit in a modified fashion compared to the single-user Gaussian channel. It is also demonstrated that successive interference cancellation at the receiver does not cause performance degradation when PAM is used by all transmitters, similar to the case of capacity-achieving transmit waveforms.