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

Summary, in English

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.

• Författare: Hemanth Prabhu; Ove Edfors; Joachim Rodrigues; Liang Liu; Fredrik Rusek
• Avdelning/ar: Institutionen för elektro- och informationsteknik; ELLIIT: the Linköping-Lund initiative on IT and mobile communication
• Publiceringsår: 2014
• Språk: Engelska
• Sidor: 114-117
• Publikation/Tidskrift/Serie: 2014 6th International Symposium on Communications, Control and Signal Processing (Isccsp)
• Fulltext: - 216 kB; Download statistics
• Dokumenttyp: Konferensbidrag
• Förlag: IEEE - Institute of Electrical and Electronics Engineers Inc.
• Ämne: Electrical Engineering, Electronic Engineering, Information Engineering
• Nyckelord: pre-coding; Massive MIMO; PAR aware
• Conference name: International Symposium on communications, control and signal processing
• Conference date: 2014-05-21
• Conference place: Athens, Greece
• Status: Published
• Projekt: Distributed antenna systems for efficient wireless systems
• Forskningsgrupp: Digital ASIC