FADAC-OFDM: Frequency-Asynchronous Distributed Alamouti-Coded OFDM

Kim, Bong-Seok; Choi, Kwonhue

doi:10.1109/tvt.2014.2325606

Cited by 10 publications

(33 citation statements)

References 18 publications

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“…FADAC-OFDM has been proposed for FO-tolerant Alamouti-coded OFDM for frequency-asynchronous distributed antenna systems [4]. FADAC-OFDM employs a frequency reversal structure at the TX side.…”

Section: Review On Fadac-ofdmmentioning

confidence: 99%

“…We consider the distributed antenna system that is composed of two TX antennas and one RX antenna. In each TX antenna, OFDM-modulated signals are transmitted with N total subcarriers, as in [1][2][3][4][5][6]. Let the variable x b,l denote the lth data symbol of the bth subblock and the variables X b,k denote the Alamouti-coded symbols at the kth subcarrier of bth subblock of TX antennas A and B, respectively.…”

Section: The System Model and The Ofdm Symbol Structure Of Fadac-ofdmmentioning

confidence: 99%

“…Let the variable x b,l denote the lth data symbol of the bth subblock and the variables X b,k denote the Alamouti-coded symbols at the kth subcarrier of bth subblock of TX antennas A and B, respectively. Figures 1 and 2 show the OFDM symbol structures of the conventional distributed Alamouticoded (CDAC) OFDM [5,6] and FADAC-OFDM [4], respectively.…”

Section: The System Model and The Ofdm Symbol Structure Of Fadac-ofdmmentioning

confidence: 99%

“…One of the main challenging issues in this area is to mitigate self-interference due to the carrier frequency offset (CFO) between the distributed transmit antennas [1][2][3][4][5][6][7][8]. Very recently in [4], the so-called FADAC-OFDM (frequency-asynchronous distributed Alamouti-coded OFDM) has been proposed and shown to outperform the other existing approaches in [3][4][5]. In contrast to the conventional distributed Alamouti-coded OFDM, FADAC-OFDM is free from ICI (intercarrier interference) terms from the near subcarriers due to its ICI self-cancelation property only by simple Alamouti-decoding process.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to the conventional distributed Alamouti-coded OFDM, FADAC-OFDM is free from ICI (intercarrier interference) terms from the near subcarriers due to its ICI self-cancelation property only by simple Alamouti-decoding process. Especially, [4] tried to exploit this ICI self-cancelation property even in the selective reconstruction is 4N 2 where N denotes the total number of OFDM subcarriers.…”

Section: Introductionmentioning

confidence: 99%

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Iterative detection for frequency-asynchronous distributed Alamouti-coded (FADAC) OFDM

Kim

Choi

2017

J Wireless Com Network

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We propose a near intercarrier interference (ICI)-free and very low complexity iterative detector for frequency-asynchronous distributed Alamouti-coded (FADAC) orthogonal frequency division multiplexing (OFDM). In the previous cancelation schemes, the entire subcarrier signals from one transmit (TX) antenna are estimated and canceled in the received signal from the other TX antenna and vice versa. However, the reliability of the estimated symbols are revealed to significantly vary across the subcarriers and thus, the poorly estimated symbols lead to the incorrect cancelation. Motivated from this, we first propose a scheme which does not cancel the interfering subcarrier(s) at the half band edges which undergo very high interference in FADAC-OFDM. For further improvement, we propose a so-called selective scheme which instantly measures the reliability of the detected symbols at each iteration and then exclude the unreliable symbols in the estimated interference generation. Moreover, the proposed scheme has a drastically reduced complexity by converting the cancelation process from the subcarrier domain to the time domain. In accordance with the analysis on the considered reliability measures, the numerical results show that the proposed scheme achieves the near ICI-free level only within three or four iterations for wide ranges of SNR, frequency offset, and delay spread.

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Section: Review On Fadac-ofdmmentioning

confidence: 99%