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SINR analysis of time and frequency offsets in OFDM systems

Sharifi, S ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.1109/LCN.2011.6115562
  3. Publisher: 2011
  4. Abstract:
  5. In this paper, the impact of both time offsets (TOs) and carrier frequency offsets (CFOs) on the average output signal-to-interference-plus-noise ratio (SINR) in a frequency selective channel is investigated with a novel approach. First, TOs are partitioned into five cases based on how they occur. Then the mathematical models for different cases are derived. Considering CFOs and benefiting from the obtained models, closed-form expression for the SINR in each case is derived. It is proved that, SINR is independent of the observed subcarrier for the given TO and CFO. Besides, it is shown that the performance of the affected system deteriorates rapidly as the number of subcarriers increases. It is also revealed that, as far as the guard interval is longer than the channel delay spread, the SINR is not much sensitive to the number of channel taps and power delay profile
  6. Keywords:
  7. Orthogonal frequency-division multiplexing (OFDM) ; Signal-to-interference-plus-noise ratio (SINR) ; Synchronization-errors ; Time offset ; Carrier frequency offsets ; Channel delay spread ; Channel taps ; Closed-form expression ; Frequency offsets ; Frequency selective channel ; Guard intervals ; OFDM systems ; Power delay profiles ; Subcarrier ; Carrier communication ; Frequency allocation ; Mathematical models ; Multiuser detection ; Signal detection ; Spurious signal noise ; Telecommunication networks ; Telecommunication systems
  8. Source: Proceedings - Conference on Local Computer Networks, LCN, 4 October 2011 through 7 October 2011 ; October , 2011 , Pages 855-859 ; 9781612849287 (ISBN)
  9. URL: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6115562