Mutual information analysis of OFDM radio link under phase noise, IQ imbalance and frequency-selective fading channel

Ahmet Gokceoglu, Yaning Zou, Mikko Valkama, Paschalis C. Sofotasios, Pramod Mathecken, Danijela Cabric

Research output: Contribution to journalArticleScientificpeer-review

27 Citations (Scopus)

Abstract

OFDM and other multicarrier waveforms are in general very sensitive to RF non-idealities, such as phase noise and IQ imbalance, of transmitting and receiving devices. Extensive work has been carried out in the open literature in analyzing the performance of OFDM radio link under such RF impairments in terms of detection error rate and mostly concentrating on one impairment at a time. However, there is only very limited work on analytical investigations of mutual information and rate loss expressions, the heart of communication theory, as functions of RF impairment levels. In this article, we derive two closed-form mutual information expressions, in the form of infinite series representation, for an arbitrary subcarrier of a general OFDM radio link impaired with transceiver phase noise and IQ imbalance in frequency-selective Rayleigh distributed block-fading radio channel, covering both uncorrelated as well as fully correlated mirror subcarrier scenarios. We also show that the mutual information saturates to a finite value due to the inherent RF impairments even in the case that the symbol-to-noise ratio approaches infinity. Extensive comparisons with results obtained from full OFDM radio link simulations are also provided to illustrate and verify the accurate match between analytical and simulated mutual information behavior.

Original languageEnglish
Article number6512538
Pages (from-to)3048-3059
Number of pages12
JournalIEEE Transactions on Wireless Communications
Volume12
Issue number6
DOIs
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed

Keywords

  • direct-conversion radio
  • frequency-selective channel
  • IQ imbalance
  • Mutual information
  • OFDM
  • phase noise

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