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Energy-Efficient Symbol-Level Precoding in Multiuser MISO Based on Relaxed Detection Region
KTH, School of Electrical Engineering (EES), Signal Processing. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre. KTH, School of Electrical Engineering and Computer Science (EECS), Information Science and Engineering. (Signal Processing)
2016 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 15, no 5, p. 3755-3767Article in journal (Refereed) Published
Abstract [en]

This paper addresses the problem of exploiting interference among simultaneous multiuser transmissions in the downlink of multiple-antenna systems. Using symbol-level precoding, a new approach toward addressing the multiuser interference is discussed through jointly utilizing the channel state information (CSI) and data information (DI). The interference among the data streams is transformed under certain conditions to a useful signal that can improve the signal-to-interference noise ratio (SINR) of the downlink transmissions and as a result the system's energy efficiency. In this context, new constructive interference precoding techniques that tackle the transmit power minimization (min power) with individual SINR constraints at each user's receiver have been proposed. In this paper, we generalize the constructive interference (CI) precoding design under the assumption that the received MPSK symbol can reside in a relaxed region in order to be correctly detected. Moreover, a weighted maximization of the minimum SNR among all users is studied taking into account the relaxed detection region. Symbol error rate analysis (SER) for the proposed precoding is discussed to characterize the tradeoff between transmit power reduction and SER increase due to the relaxation. Based on this tradeoff, the energy efficiency performance of the proposed technique is analyzed. Finally, extensive numerical results show that the proposed schemes outperform other state-of-the-art techniques. © 2002-2012 IEEE

Place, publisher, year, edition, pages
2016. Vol. 15, no 5, p. 3755-3767
Keywords [en]
Antennas;Downlink;Interference;Modulation;Receivers;Signal to noise ratio;Constructive interference;multicast;multiuser MISO;relaxed detection
National Category
Signal Processing
Identifiers
URN: urn:nbn:se:kth:diva-259144DOI: 10.1109/TWC.2016.2528243ISI: 000378504100049Scopus ID: 2-s2.0-84969570413OAI: oai:DiVA.org:kth-259144DiVA, id: diva2:1350611
Available from: 2019-09-11 Created: 2019-09-11 Last updated: 2019-09-30Bibliographically approved

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