The proposed scheduling framework is adapted to the receiver architecture (MMSE) that you are using. What if you would use a more advanced receiver, like a SIC – how would that change the scheduling strategy?
in our work we only consider linear receivers such as ZF and MMSE. Only in this linear framework we derive a post-equalization SINR equation for user u. This is then exploited to perform CQI adaptation to the current channel state by an effective SINR mapping. However, since we assume that if a user is scheduled, it is assigned the whole bandwidth, the CQI value does not influence the scheduling strategy.
For scheduling we choose user pairings such that channels are as orthogonal as possible to each other, such that the interference between them is small. This is done by employing the Semi-orthogonal User Selection (SUS) algorithm. Although this algorithm was initially designed for a ZF equalizer, we show scheduling gains also when an MMSE equalizer is employed. Although SUS is not an optimal algorithm, we believe that this scheduling strategy is still applicable in the case of a SIC receiver.
Lukas & Stefan
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