Multi-user interference cancellation schemes for carrier frequency offset compensation in uplink OFDMA

Huan Cong Nguyen, Elisabeth De Carvalho, Ramjee Prasad

Research output: Contribution to journalJournal articleResearchpeer-review

25 Citations (Scopus)
533 Downloads (Pure)

Abstract

Each user in the uplink of an Orthogonal Frequency Division Multiple Access (OFDMA) system may experience a different carrier frequency offset (CFO). These uncorrected CFOs destroy the orthogonality among subcarriers, causing inter-carrier interference and multi-user interference, which degrade the system performance severely. In this paper, novel time-domain multi-user interference cancellation schemes for OFDMA uplink are proposed. They employ an architecture with multiple and numerical evaluations show that the proposed schemes achieve a significant performance gain compared to the conventional receiver and a reference frequency-domain multi-user interference cancellation scheme. In a particular scenario, a maximum CFO of up to 40% of the subcarrier spacing can be tolerated, and the CFO-free performance is maintained in the OFDMA uplink. The proposed schemes outperform the multi-user interference cancellation techniques for Orthogonal Frequency Division Multiple Access (OFDMA) available in literature with comparable or lower complexity.
Original languageEnglish
JournalIEEE Transactions on Wireless Communications
ISSN1536-1276
DOIs
Publication statusPublished - Mar 2014

Keywords

  • synchronization
  • OFDMA
  • uplink
  • timing offset
  • frequency offset
  • multiuser
  • interference
  • cancellation

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