329 citations · 598 across the 7 of their papers we have counts for
9 papers
Two-Layer Decoding in Cellular Massive MIMO Systems with Spatial Channel Correlation
Trinh Van Chien, Christopher Mollén, Emil Björnson
This paper studies a two-layer decoding method that mitigates inter-cell interference in multi-cell Massive MIMO systems. In layer one, each base station (BS) estimates the channel…
Large-Scale-Fading Decoding in Cellular Massive MIMO Systems with Spatially Correlated Channels
Trinh Van Chien, Christopher Mollén, Emil Björnson
Massive multiple-input--multiple-output (MIMO) systems can suffer from coherent intercell interference due to the phenomenon of pilot contamination. This paper investigates a two-l…
Impact of Spatial Filtering on Distortion from Low-Noise Amplifiers in Massive MIMO Base Stations
Christopher Mollén, Ulf Gustavsson, Thomas Eriksson +1
In massive MIMO base stations, power consumption and cost of the low-noise amplifiers (LNAs) can be substantial because of the many antennas. We investigate the feasibility of inex…
Spatial Characteristics of Distortion Radiated from Antenna Arrays with Transceiver Nonlinearities
Christopher Mollén, Ulf Gustavsson, Thomas Eriksson +1
The distortion from massive MIMO (multiple-input--multiple-output) base stations with nonlinear amplifiers is studied and its radiation pattern is derived. The distortion is analyz…
Achievable Uplink Rates for Massive MIMO with Coarse Quantization
Christopher Mollén, Junil Choi, Erik G. Larsson +1
The high hardware complexity of a massive MIMO base station, which requires hundreds of radio chains, makes it challenging to build commercially. One way to reduce the hardware com…
Out-of-Band Radiation from Large Antenna Arrays
Christopher Mollén, Erik G. Larsson, Ulf Gustavsson +2
Co-existing wireless systems, which share a common spectrum, need to mitigate out-of-band (OOB) radiation to avoid excessive interference. For legacy systems, OOB radiation is well…
Uplink Performance of Wideband Massive MIMO with One-Bit ADCs
Christopher Mollén, Junil Choi, Erik G. Larsson +1
Analog-to-digital converters (ADCs) stand for a significant part of the total power consumption in a massive MIMO base station. One-bit ADCs are one way to reduce power consumption…
Out-of-Band Radiation Measure for MIMO Arrays with Beamformed Transmission
Christopher Mollén, Ulf Gustavsson, Thomas Eriksson +1
The spatial characteristics of the out-of-band radiation that a multiuser MIMO system emits in the environment, due to its power amplifiers (modeled by a polynomial model) are nonl…
Waveforms for the Massive MIMO Downlink: Amplifier Efficiency, Distortion and Performance
Christopher Mollén, Erik G. Larsson, Thomas Eriksson
In massive MIMO, most precoders result in downlink signals that suffer from high PAR, independently of modulation order and whether single-carrier or OFDM transmission is used. The…