Localized or interleaved? A tradeoff between diversity and cfo interference in multipath channels

S. H. Song, G. L. Chen, Khaled Letaief

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Carrier frequency offset (CFO) damages the orthogonality between sub-carriers and thus causes multiuser interference in uplink OFDMA/SC-FDMA systems. For a given CFO, such multiuser interference is mainly dictated by channel (sub-carrier) allocation, which also specifies the diversity gain of one user over multi-path channels. In particular, the positions of one user's sub-channels will determine its diversity gain, while the distances between sub-channels of the concerned user and those of others will govern the CFO interference. Two popular channel allocation methods are the localized and interleaved (distributed) schemes where the former has less CFO interference but the latter achieves more diversity gain. In this paper, we will consider the channel allocation scheme for uplink LTE systems by investigating the effects of channel allocation on both of the diversity gain and CFO interference. By combining these two effects, we will propose a semi-interleaved scheme, which achieves full diversity gain with minimum CFO interference.

Original languageEnglish
Article number5961160
Pages (from-to)2829-2834
Number of pages6
JournalIEEE Transactions on Wireless Communications
Volume10
Issue number9
DOIs
Publication statusPublished - Sep 2011
Externally publishedYes

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Keywords

  • carrier frequency offset
  • diversity gain
  • OFDMA
  • SC-FDMA

ASJC Scopus subject areas

  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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