Achievable rates and training overheads for a measured LOS massive MIMO channel

Paul Harris*, Wael Boukley Hasan, Liang Liu, Steffen Malkowsky, Mark Beach, Simon Armour, Fredrik Tufvesson, Ove Edfors

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

5 Citations (Scopus)
305 Downloads (Pure)


This letter presents achievable uplink sum-rate predictions for a measured line-of-sight (LOS) massive multiple-input multiple-output (MMIMO) scenario and illustrates the tradeoff between spatial multiplexing performance and channel de-coherence rate for an increasing number of base station (BS) antennas. In addition, an orthogonal frequency division multiplexing (OFDM) case study is formed which considers the 90% coherence time to evaluate the impact of MMIMO channel training overheads in high-speed LOS scenarios. It is shown that while 25% of the achievable zero-forcing sum-rate is lost when the resounding interval is increased by a factor of 4, the OFDM training overheads for a 100-antenna MMIMO BS using a long-term evolution-like physical layer could be as low as 2% for a terminal speed of 90 m/s.

Original languageEnglish
Article number8274927
Pages (from-to)594-597
Number of pages4
JournalIEEE Wireless Communications Letters
Issue number4
Early online date30 Jan 2018
Publication statusPublished - Aug 2018


  • field trials
  • LOS
  • Massive MIMO
  • mobility
  • testbed


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