High Throughput Constant Envelope Pre-coder for Massive MIMO Systems

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


This study describes a high throughput constant envelope (CE) pre-coder for Massive MIMO systems. A large number of antennas (M), in the order of 100s, serve a relatively small number of users (K) simultaneously. The stringent amplitude constraint (only phase changes) in the CE scheme is motivated by the use of highly power-efficient non-linear RF power amplifiers. We propose a scheme that computes the CE signals to be transmitted based on box-constrained regression (coordinatedescent),with an O(2MK) complexity per iteration per user
symbol. A highly scalable systolic architecture is implemented, where M Processing Elements (PEs) perform the pre-coding for a system with up to K = 16 users. This systolic architecture results in a very high throughput of 500 Msamples/sec (at 500 MHz clock rate) with a gate count of 14 K per PE in 65 nm technology.


Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Electrical Engineering, Electronic Engineering, Information Engineering


  • massive mimo, pre-coding, constant envelope, gradient descent
Original languageEnglish
Title of host publication[Host publication title missing]
PublisherIEEE - Institute of Electrical and Electronics Engineers Inc.
Number of pages4
Publication statusAccepted/In press - 2015
Publication categoryResearch
EventIEEE International Symposium on Circuits and Systems (ISCAS), 2015 - Lisbon, Portugal
Duration: 2015 May 242015 May 27


ConferenceIEEE International Symposium on Circuits and Systems (ISCAS), 2015

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