Quantized Polar Transmitters for Power Efficient Massive MIMO Systems

Guixian Xu, Vesa Lampu, Marko Kosunen, Kari Stadius, Jussi Ryynanen, Mikko Valkama, Lauri Anttila

Research output: Contribution to journalArticleScientificpeer-review

Abstract

This letter investigates the feasibility of the quantized digital polar transmitter architecture in a downlink multi-user massive multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) system, where a low amplitude resolution and a moderate phase resolution are utilized. We derive a lower bound on the average sum-rate achievable with Gaussian signaling inputs and linear precoding by a simple diagonal approximation for the quantization distortion. The analysis and simulations demonstrate that the quantized polar transmitter can enable excellent performance in terms of average sum-rate throughput, symbol error rate (SER), and out-of-band (OOB) emission level, thus providing an attractive option for the traditional Cartesian architecture.

Original languageEnglish
Number of pages5
JournalIEEE WIRELESS COMMUNICATIONS LETTERS
DOIs
Publication statusE-pub ahead of print - 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • linear precoding
  • Massive MIMO
  • OFDM
  • polar transmitter
  • power efficiency
  • quantization.
  • transmitter architectures

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