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- Christopher Mollen, Erik G. Larsson, Thomas Eriksson
- IEEE Transactions on Communications
- 2016

In massive multiple-input multiple-output (MIMO), most precoders result in downlink signals that suffer from high peak-to-average ratio (PAR), independently of modulation order and whetherâ€¦ (More)

- Christopher Mollen, Ulf Gustavsson, Thomas Eriksson, Erik G. Larsson
- 2016 IEEE International Conference onâ€¦
- 2016

The spatial characteristics of the out-of-band radiation that a multiuser MIMO system emits, due to its power amplifiers (modeled by a polynomial model) being nonlinear, are studied by deriving anâ€¦ (More)

- Christopher Mollen, Erik G. Larsson, Ulf Gustavsson, Thomas Eriksson, Robert W. Heath
- IEEE Communications Magazine
- 2018

The OOB radiation from large arrays with nonlinear hardware has a different radiation pattern than the beamformed in-band signal. This is the main difference between the OOB radiation from largeâ€¦ (More)

- Salil Kashyap, Christopher Mollen, Emil BjÃ¶rnson, Erik G. Larsson
- 2016 IEEE 17th International Workshop on Signalâ€¦
- 2016

We consider massive multiple input multiple output (MIMO) systems with orthogonal frequency division multiplexing (OFDM) that use zero-forcing (ZF) to combat interference. To perform ZF, largeâ€¦ (More)

- Christopher Mollen, Junil Choi, Erik G. Larsson, Robert W. Heath
- 2016 IEEE International Conference on Acousticsâ€¦
- 2016

We investigate the performance of wideband massive MIMO base stations that use one-bit ADCs for quantizing the uplink signal. Our main result is to show that the many taps of the frequency-selectiveâ€¦ (More)

- Christopher Mollen, Junil Choi, Erik G. Larsson, Robert W. Heath
- 2017 IEEE International Conference on Acousticsâ€¦
- 2017

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 complexity and powerâ€¦ (More)

- Christopher Mollen, Junil Choi, Erik G. Larsson, Robert W. Heath
- ArXiv
- 2016

- Christopher Mollen, Erik G. Larsson
- 2015 IEEE 16th International Workshop on Signalâ€¦
- 2015

A transmission scheme for the multiuser MIMO downlink, where the transmit signal from each antenna has constant envelope and a limited bandwidth, is proposed in order to enable the use of highlyâ€¦ (More)

- Salil Kashyap, Christopher Mollen, Emil BjÃ¶rnson, Erik G. Larsson
- 2017 IEEE International Conference on Acousticsâ€¦
- 2017

In massive MIMO systems, which rely on uplink pilots to estimate the channel, the time interval between pilot transmissions constrains the length of the downlink. Since switching between up- andâ€¦ (More)