An EM-based OFDM receiver for time-variant channels

Tareq Y. Al-Naffouri*, Ahmad Bahai, Arogyaswami Paulraj

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

18 Scopus citations


OFDM modulation combines the advantages of high achievable rates and relatively easy implementation. However, for proper recovery of the input, the receiver needs accurate channel information. In this paper, we propose an expectation-maximization (EM) algorithm for joint channel and data recovery. The algorithm makes use of the rich structure of the underlying communication problem- a structure induced by the data and channel constraints. These constraints include pilots, the cyclic prefix (CP), and the finite alphabet constraints on the data, and sparsity, finite delay spread, and the statistical properties of the channel (time and frequency correlation) . Channel identification and equalization is performed optimally and recovery is achieved within the same OFDM symbol using an EM based Kalman filter.

Original languageEnglish (US)
Number of pages5
StatePublished - 2002
Externally publishedYes
EventGLOBECOM'02 - IEEE Global Telecommunications Conference - Taipei, Taiwan, Province of China
Duration: Nov 17 2002Nov 21 2002


OtherGLOBECOM'02 - IEEE Global Telecommunications Conference
Country/TerritoryTaiwan, Province of China

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Global and Planetary Change


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