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This paper considers the uplink of a single-cell large-scale multiuser multiple-input multiple-output (MU-MIMO) system. The transmitted data is detected by linear receivers at the base station (BS), that is, maximum ratio combining (MRC), zero-forcing (ZF) and minimum mean square error (MMSE). New non-asymptotic outage expressions that are valid for any number of BS antennas are derived. It is shown...
We propose an adaptive layered space-frequency equalization (ALSFE) structure to deal with the multiple-input multiple-output (MIMO) time-varying frequency selective channels, where at each stage of detection, a group of selected data streams are detected and are then cancelled from the received signals. Two types of adaptive channel estimation approaches are employed for ALSFE, assuming respectively...
Literatures on precoding for massive MIMO, one disruptive technology for enabling 5G, have been mainly about metrics such as capacity and peak-to-average reduction. But for practical systems, block error rate (BLER) is one essential parameter that decides whether the system can work properly. In this work, we consider BLER of different precoding methods, and find that when applied to OFDM based massive...
Using relays, wireless relay systems can provide reliable transmissions when the distance between a source node (SN) and a destination node (DN) is sufficiently long and the transmission power is limited. In this paper, we study the application of the hybrid automatic repeat request (HARQ) protocol with incremental redundancy (HARQ-IR) to wireless relay systems for energy efficient reliable packet...
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