A low-complex peak-to-average power reduction scheme for OFDM based massive MIMO systems

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding


An Orthogonal Frequency-Division Multiplexing (OFDM) based multi-user massive Multiple-Input Multiple-Output (MIMO) system is considered. The problem of high Peak-to-Average Ratio (PAR) in OFDM based systems is well known and the large number of antennas (RF-chains) at the Base Station (BS) in massive MIMO systems aggravates this further, since large numbers of these Power Amplifiers (PAs) are used. High PAR necessitates linear PAs, which have a high hardware cost and are typically power inefficient. In this paper we propose a low-complex approach to tackle the issue. The idea is to deliberately clip signals sent to one set of antennas, while compensating for this by transmitting correction signals on a set of reserved antennas (antenna-reservation). A reduction of 4 dB in PAR is achieved by reserving 25% of antennas, with only a 15% complexity overhead.


Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Electrical Engineering, Electronic Engineering, Information Engineering


  • pre-coding, Massive MIMO, PAR aware
Original languageEnglish
Title of host publication2014 6th International Symposium on Communications, Control and Signal Processing (Isccsp)
PublisherIEEE - Institute of Electrical and Electronics Engineers Inc.
Publication statusPublished - 2014
Publication categoryResearch
EventInternational Symposium on communications, control and signal processing - Athens, Greece
Duration: 2014 May 21 → …


ConferenceInternational Symposium on communications, control and signal processing
Period2014/05/21 → …

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