An approach to data-driven echo cancellation in OQAM-based multicarrier data transmission

Nedic, S.

doi:10.1109/26.855512

Cited by 18 publications

(3 citation statements)

References 10 publications

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“…Therefore, the transmitted real‐valued symbol on the m th SC of n th OFDM/OQAM block is

\begin{matrix} right leftthickmathspace.5em \\ d_{m, n} = a_{m, k}^{normalR} if n = 2 k, \\ d_{m, n} = a_{m, k}^{normalI} if n = 2 k + 1. \end{matrix}

v_{0}

and

τ_{0}

are the SC spacing and the OQAM symbol duration, respectively.

g ()(, t)

is the prototype filter, while the basis function

g_{m, n} ()(, t)

is the shifted version of

g ()(, t)

, whose orthogonal condition only holds in the real field, as shown in [10, 11, 18] and given by

Re (}{, (⟩⟨, g_{m, n}, g_{m + p, n + q})) = Re (}{, \int_{- normal∞}^{\infty} g_{m, n} (t) g_{m + p, n + q}^{*} (t) d t) = ({, \begin{matrix} 1em4pt \\ 1, & ()(, p, q) = ()(, 0, 0) \\ 0, & ()(, p, q) \neq ()(, 0, 0) \end{matrix}),

where Re takes the real part of the vector. In order to obtain a real value OFDM/OQAM signal, the input of data block should satisfy

d_{m, n} = ({, \begin{matrix} 1em4pt \\ 0, & if m = 0, \frac{M}{2} \\ {false(- 1 false)}^{n} d_{M - m,} \end{matrix})

…”

Section: Ofdm/oqam Schemementioning

confidence: 99%

“…OFDM/offset quadrature amplitude modulation (OFDM/OQAM) utilises well‐designed pulse shapes but no CP, and hence has the advantages of reduced out‐of‐band energy and a higher spectral efficiency [10, 11]. To date, OFDM/OQAM systems have already been introduced in the digital ratio technical standards [12], wireless regional area network (WRAN IEEE 802.22) [13], coherent optical communications [14–16], and intensity modulation and direct detection (IM/DD) transmission system [17].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Efficient frequency‐domain channel equalisation methods for OFDM/OQAM‐PON with intensity modulation and direct detection

et al. 2017

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“…Therefore, the transmitted real‐valued symbol on the m th SC of n th OFDM/OQAM block is

\begin{matrix} right leftthickmathspace.5em \\ d_{m, n} = a_{m, k}^{normalR} if n = 2 k, \\ d_{m, n} = a_{m, k}^{normalI} if n = 2 k + 1. \end{matrix}

v_{0}

and

τ_{0}

are the SC spacing and the OQAM symbol duration, respectively.

g ()(, t)

is the prototype filter, while the basis function

g_{m, n} ()(, t)

is the shifted version of

g ()(, t)

, whose orthogonal condition only holds in the real field, as shown in [10, 11, 18] and given by

Re (}{, (⟩⟨, g_{m, n}, g_{m + p, n + q})) = Re (}{, \int_{- normal∞}^{\infty} g_{m, n} (t) g_{m + p, n + q}^{*} (t) d t) = ({, \begin{matrix} 1em4pt \\ 1, & ()(, p, q) = ()(, 0, 0) \\ 0, & ()(, p, q) \neq ()(, 0, 0) \end{matrix}),

where Re takes the real part of the vector. In order to obtain a real value OFDM/OQAM signal, the input of data block should satisfy

d_{m, n} = ({, \begin{matrix} 1em4pt \\ 0, & if m = 0, \frac{M}{2} \\ {false(- 1 false)}^{n} d_{M - m,} \end{matrix})

…”

Section: Ofdm/oqam Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Efficient frequency‐domain channel equalisation methods for OFDM/OQAM‐PON with intensity modulation and direct detection

et al. 2017

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“…For the virtue of higher spectrum efficiency brought by the elimination of guard interval and lower out of band radiation resorting to the aid of specially designed filter bank, OFDM/offset-QAM (OFDM/OQAM) has been considered as a good alternative for conventional OFDM [3][4][5]. As discussed by many previous publications in wireless communication, OFDM/OQAM transmit real-valued data symbols and the orthogonal conditions only hold in the real field [5].…”

Section: Introductionmentioning

confidence: 99%

Frequency-Domain Channel Estimation for Polarization-Division-Multiplexed CO-OFDM/OQAM Systems

Fang

Chen

et al. 2015

J. Lightwave Technol.

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Intrinsic imaginary interference (IMI) induced by multiple-path fading channel is an important impairment for orthogonal frequency division multiplexing offset-quadrature amplitude modulation (OFDM/OQAM) systems. Therefore the accurate channel estimation is highly desired for such system. Recently both the simulation studies and the experimental demonstrations for coherent optical OFDM/OQAM (CO-OFDM/OQAM) have been reported. However, there are no theoretical discussions on the IMI effect and the channel estimation method for polarization-division-multiplexed (PDM) CO-OFDM/OQAM systems so far. In this paper, we systematically analyze the frequency-domain optical fiber channel transmission model for PDM CO-OFDM/OQAM systems with the IMI effect induced by chromatic dispersion (CD) and polarization mode dispersion (PMD). The full loaded (FL) and the half loaded (HL) frequency-domain channel estimation methods are discussed to mitigate the IMI effect. The computational complexities and robustness against CD and PMD are also compared for both of the FL and the HL methods. The theoretical analysis is validated by numerical Monte Carlo simulations of PDM CO-OFDM/OQAM systems. IndexTerms-Optical communication, coherent communication, orthogonal frequency division multiplexing offset-quadrature amplitude modulation (OFDM/OQAM), channel estimation. I.The authors are with the State

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Combined phase offset channel estimation method for optical OFDM/OQAM

Fang

Suo

Zhang

et al. 2021

Optical Fiber Technology

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An approach to data-driven echo cancellation in OQAM-based multicarrier data transmission

Cited by 18 publications

References 10 publications

Efficient frequency‐domain channel equalisation methods for OFDM/OQAM‐PON with intensity modulation and direct detection

Efficient frequency‐domain channel equalisation methods for OFDM/OQAM‐PON with intensity modulation and direct detection

Frequency-Domain Channel Estimation for Polarization-Division-Multiplexed CO-OFDM/OQAM Systems

Combined phase offset channel estimation method for optical OFDM/OQAM

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