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access icon free Reception and detection of a wide-band OFDM signal in a Doppler spreading channel

  • Author(s): Lili Ma 1, 2 ; Wei Jiang 1 ; Haige Xiang 1
    • View affiliations
  • Source: Volume 12, Issue 9, 05 June 2018, p. 1134 – 1140
    DOI:  10.1049/iet-com.2017.0571 , Print ISSN 1751-8628, Online ISSN 1751-8636
© The Institution of Engineering and Technology
Received 16/05/2017, Accepted 22/02/2018, Revised 02/02/2018, Published 23/02/2018

This study focuses on the reception strategy and the detection method of a wideband orthogonal frequency-division multiplexing (OFDM) signal, which is passing through a Doppler channel. Most prior works regarded the Doppler effect as a reason of interchannel interference due to its destruction of the subcarrier orthogonality. Distinguishing from those works, the authors point out that the wideband OFDM signal is still an OFDM signal with subcarrier orthogonality after passing the channel with single Doppler scaling factor. Thus, the received OFDM signal passing the Doppler spreading channel is a linear superposition of a set of transmitted OFDM signals associated with different parameters. To make full use of the diversity gain offered by the superposition, the authors propose a strategy of diversity reception and a belief propagation detection method for the received wideband OFDM signal. The simulation results show that the proposed strategy improves the performance obviously with increase of the diversity order in a Doppler spreading channel. It offers different options for system demands. Furthermore, the proposed detection method can offer an acceptable performance even it combined with the conventional sampling process. It makes the conventional structure replacing the common resampling structure possible in a wideband OFDM system.

Inspec keywords: signal detection; diversity reception; OFDM modulation; Doppler effect; adjacent channel interference

Other keywords: wideband OFDM signal detection method; sampling process; linear superposition; wideband OFDM signal reception strategy; subcarrier orthogonality; Doppler spreading channel; Doppler effect; interchannel interference; belief propagation detection method; resampling structure; diversity reception strategy; Doppler channel; diversity gain; single Doppler scaling factor; wideband orthogonal frequency-division multiplexing signal

Subjects: Signal processing theory; Modulation and coding methods; Signal detection

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