Achieving vertices of the capacity region of the synchronous Gaussian correlated-waveform multiple-access channel with decision-feedback receivers

Fading channels: information-theoretic and communications aspects

“…So far we have addressed some works [62], [315], [116], [229], [297], [197], [232], [230], [231], [115], [333], [334] which demonstrate the theoretical optimality of this method in a rather general multiple-access framework, which also accounts for flat as well as dispersive fading channels [230], [231]. The practical appeal of these methods stems from their "single-user"-based rationale, and they provide an alternative to classical orthogonal channel-access techniques such as TDMA, FDMA, and orthogonal CDMA.…”

“…The transmitted powers are selected so as to yield the right distribution for successive cancellation of received power accounting for the statistics of the fading gain factors. Successive cancellation interpreted in terms of decision feedback in case of a vector correlated multiple channel is discussed in [297], where standard known procedures of linear estimation are used to evaluate the sum rate constraining average mutual information expressions. Though [297] evaluates the results for Gaussian additive noise only, the results extend directly to the fading regime with CSI available to the receiver only or to both transmitter and receiver.…”

“…Successive cancellation interpreted in terms of decision feedback in case of a vector correlated multiple channel is discussed in [297], where standard known procedures of linear estimation are used to evaluate the sum rate constraining average mutual information expressions. Though [297] evaluates the results for Gaussian additive noise only, the results extend directly to the fading regime with CSI available to the receiver only or to both transmitter and receiver. Successive cancellation with reference to cellular models is discussed in [45], [231], and [323] to be referred to in the following.…”

“…This is demonstrated in the generalized per-user time sharing, which demands no interuser synchronization [116], [229], where interleaving (or interlacing) is essential to attain the optimum. Another example, where there is interplay between standard DFE procedures and the multiple-user regime, is the model of [297], where again it suits the standard vector single-user Gaussian channel [296], [131] with i.i.d. inputs of the multipleuser regime [297].…”

“…Another example, where there is interplay between standard DFE procedures and the multiple-user regime, is the model of [297], where again it suits the standard vector single-user Gaussian channel [296], [131] with i.i.d. inputs of the multipleuser regime [297]. In all those examples, which were originally developed for Gaussian nonfading channels, the fading effect can be straightforwardly introduced and accounted for.…”