Low Complexity Multiple User Detection for SC-FDE with OQPSK Signals

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

It is widely accepted that SC-FDE (Single Carrier with Frequency Domain Equalization) schemes are preferable for the uplink of broadband wireless systems since these signals have lower PAPR (Peak to Average Power Ratio) than OFDM (Orthogonal Frequency Division Multiplexing) signals. However, when we want to employ power-efficient grossly nonlinear amplifiers, as in satellite communications, the SC signals must have quasi-constant envelopes which have a spectral occupation much higher than the minimum Nyquist band, resulting in low spectral efficiency. In this paper we consider a low complexity pragmatic FDMA (Frequency Division Multiple Access) system employing OQPSK (Offset Quaternary Phase Shift Keying) modulations with quasi-constant envelope that increases the overall spectral efficiency by considering total spectral overlapping of two different users. To mitigate the overall interference, we present an iterative frequency-domain receiver with parallel multiple user detection capable to cope with ISI (Inter-Symbol Interference), CCI (Co-Channel Interference) levels inherent to the spectral overlapping, and IQI (In-phase/Quadrature Interference), the interference between the in-phase (I) and quadrature (Q) components of the OQPSK signals, for severely time-dispersive channels.
Original languageUnknown
Title of host publicationTelecommunications and Multimedia (TEMU), International Conference on
Pages127 - 131
DOIs
Publication statusPublished - 1 Jan 2014
EventInternational Conference on Telecommunications and Multimedia (TEMU), 2014 -
Duration: 1 Jan 2014 → …

Conference

ConferenceInternational Conference on Telecommunications and Multimedia (TEMU), 2014
Period1/01/14 → …

Keywords

    Cite this

    Montezuma de Carvalho, P. M. D. A. B., Dinis, R. M. H. D. M., & DEE Group Author (2014). Low Complexity Multiple User Detection for SC-FDE with OQPSK Signals. In Telecommunications and Multimedia (TEMU), International Conference on (pp. 127 - 131) https://doi.org/10.1109/TEMU.2014.6917748
    Montezuma de Carvalho, Paulo Miguel de Araújo Borges ; Dinis, Rui Miguel Henriques Dias Morgado ; DEE Group Author. / Low Complexity Multiple User Detection for SC-FDE with OQPSK Signals. Telecommunications and Multimedia (TEMU), International Conference on. 2014. pp. 127 - 131
    @inproceedings{3c8589707722461d91436761c0099e6c,
    title = "Low Complexity Multiple User Detection for SC-FDE with OQPSK Signals",
    abstract = "It is widely accepted that SC-FDE (Single Carrier with Frequency Domain Equalization) schemes are preferable for the uplink of broadband wireless systems since these signals have lower PAPR (Peak to Average Power Ratio) than OFDM (Orthogonal Frequency Division Multiplexing) signals. However, when we want to employ power-efficient grossly nonlinear amplifiers, as in satellite communications, the SC signals must have quasi-constant envelopes which have a spectral occupation much higher than the minimum Nyquist band, resulting in low spectral efficiency. In this paper we consider a low complexity pragmatic FDMA (Frequency Division Multiple Access) system employing OQPSK (Offset Quaternary Phase Shift Keying) modulations with quasi-constant envelope that increases the overall spectral efficiency by considering total spectral overlapping of two different users. To mitigate the overall interference, we present an iterative frequency-domain receiver with parallel multiple user detection capable to cope with ISI (Inter-Symbol Interference), CCI (Co-Channel Interference) levels inherent to the spectral overlapping, and IQI (In-phase/Quadrature Interference), the interference between the in-phase (I) and quadrature (Q) components of the OQPSK signals, for severely time-dispersive channels.",
    keywords = "Iterative receivers, Offset modulations, MUD, SC-FDE, CCI, IQI",
    author = "{Montezuma de Carvalho}, {Paulo Miguel de Ara{\'u}jo Borges} and Dinis, {Rui Miguel Henriques Dias Morgado} and {DEE Group Author}",
    year = "2014",
    month = "1",
    day = "1",
    doi = "10.1109/TEMU.2014.6917748",
    language = "Unknown",
    pages = "127 -- 131",
    booktitle = "Telecommunications and Multimedia (TEMU), International Conference on",

    }

    Montezuma de Carvalho, PMDAB, Dinis, RMHDM & DEE Group Author 2014, Low Complexity Multiple User Detection for SC-FDE with OQPSK Signals. in Telecommunications and Multimedia (TEMU), International Conference on. pp. 127 - 131, International Conference on Telecommunications and Multimedia (TEMU), 2014, 1/01/14. https://doi.org/10.1109/TEMU.2014.6917748

    Low Complexity Multiple User Detection for SC-FDE with OQPSK Signals. / Montezuma de Carvalho, Paulo Miguel de Araújo Borges; Dinis, Rui Miguel Henriques Dias Morgado; DEE Group Author.

    Telecommunications and Multimedia (TEMU), International Conference on. 2014. p. 127 - 131.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    TY - GEN

    T1 - Low Complexity Multiple User Detection for SC-FDE with OQPSK Signals

    AU - Montezuma de Carvalho, Paulo Miguel de Araújo Borges

    AU - Dinis, Rui Miguel Henriques Dias Morgado

    AU - DEE Group Author

    PY - 2014/1/1

    Y1 - 2014/1/1

    N2 - It is widely accepted that SC-FDE (Single Carrier with Frequency Domain Equalization) schemes are preferable for the uplink of broadband wireless systems since these signals have lower PAPR (Peak to Average Power Ratio) than OFDM (Orthogonal Frequency Division Multiplexing) signals. However, when we want to employ power-efficient grossly nonlinear amplifiers, as in satellite communications, the SC signals must have quasi-constant envelopes which have a spectral occupation much higher than the minimum Nyquist band, resulting in low spectral efficiency. In this paper we consider a low complexity pragmatic FDMA (Frequency Division Multiple Access) system employing OQPSK (Offset Quaternary Phase Shift Keying) modulations with quasi-constant envelope that increases the overall spectral efficiency by considering total spectral overlapping of two different users. To mitigate the overall interference, we present an iterative frequency-domain receiver with parallel multiple user detection capable to cope with ISI (Inter-Symbol Interference), CCI (Co-Channel Interference) levels inherent to the spectral overlapping, and IQI (In-phase/Quadrature Interference), the interference between the in-phase (I) and quadrature (Q) components of the OQPSK signals, for severely time-dispersive channels.

    AB - It is widely accepted that SC-FDE (Single Carrier with Frequency Domain Equalization) schemes are preferable for the uplink of broadband wireless systems since these signals have lower PAPR (Peak to Average Power Ratio) than OFDM (Orthogonal Frequency Division Multiplexing) signals. However, when we want to employ power-efficient grossly nonlinear amplifiers, as in satellite communications, the SC signals must have quasi-constant envelopes which have a spectral occupation much higher than the minimum Nyquist band, resulting in low spectral efficiency. In this paper we consider a low complexity pragmatic FDMA (Frequency Division Multiple Access) system employing OQPSK (Offset Quaternary Phase Shift Keying) modulations with quasi-constant envelope that increases the overall spectral efficiency by considering total spectral overlapping of two different users. To mitigate the overall interference, we present an iterative frequency-domain receiver with parallel multiple user detection capable to cope with ISI (Inter-Symbol Interference), CCI (Co-Channel Interference) levels inherent to the spectral overlapping, and IQI (In-phase/Quadrature Interference), the interference between the in-phase (I) and quadrature (Q) components of the OQPSK signals, for severely time-dispersive channels.

    KW - Iterative receivers

    KW - Offset modulations

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    KW - CCI

    KW - IQI

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    DO - 10.1109/TEMU.2014.6917748

    M3 - Conference contribution

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    BT - Telecommunications and Multimedia (TEMU), International Conference on

    ER -

    Montezuma de Carvalho PMDAB, Dinis RMHDM, DEE Group Author. Low Complexity Multiple User Detection for SC-FDE with OQPSK Signals. In Telecommunications and Multimedia (TEMU), International Conference on. 2014. p. 127 - 131 https://doi.org/10.1109/TEMU.2014.6917748