Two-Step Multiuser Equalization for Hybrid mmWave Massive MIMO GFDM Systems
Although millimeter-wave (mmWave) and massive multiple input multiple output (mMIMO) can be considered as promising technologies for future mobile communications (beyond 5G or 6G), some hardware limitations limit their applicability. The hybrid analog-digital architecture has been introduced as a po...
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| Vydané v: | Electronics (Basel) Ročník 9; číslo 8; s. 1220 |
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| Hlavní autori: | , , , , , , , |
| Médium: | Journal Article |
| Jazyk: | English |
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01.08.2020
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| ISSN: | 2079-9292, 2079-9292 |
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| Abstract | Although millimeter-wave (mmWave) and massive multiple input multiple output (mMIMO) can be considered as promising technologies for future mobile communications (beyond 5G or 6G), some hardware limitations limit their applicability. The hybrid analog-digital architecture has been introduced as a possible solution to avoid such issues. In this paper, we propose a two-step hybrid multi-user (MU) equalizer combined with low complexity hybrid precoder for wideband mmWave mMIMO systems, as well as a semi-analytical approach to evaluate its performance. The new digital non-orthogonal multi carrier modulation scheme generalized frequency division multiplexing (GFDM) is considered owing to its efficient performance in terms of achieving higher spectral efficiency, better control of out-of-band (OOB) emissions, and lower peak to average power ratio (PAPR) when compared with the orthogonal frequency division multiplexing (OFDM) access technique. First, a low complexity analog precoder is applied on the transmitter side. Then, at the base station (BS), the analog coefficients of the hybrid equalizer are obtained by minimizing the mean square error (MSE) between the hybrid approach and the full digital counterpart. For the digital part, zero-forcing (ZF) is used to cancel the MU interference not mitigated by the analog part. The performance results show that the performance gap of the proposed hybrid scheme to the full digital counterpart reduces as the number of radio frequency (RF) chains increases. Moreover, the theoretical curves almost overlap with the simulated ones, which show that the semi-analytical approach is quite accurate. |
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| AbstractList | Although millimeter-wave (mmWave) and massive multiple input multiple output (mMIMO) can be considered as promising technologies for future mobile communications (beyond 5G or 6G), some hardware limitations limit their applicability. The hybrid analog-digital architecture has been introduced as a possible solution to avoid such issues. In this paper, we propose a two-step hybrid multi-user (MU) equalizer combined with low complexity hybrid precoder for wideband mmWave mMIMO systems, as well as a semi-analytical approach to evaluate its performance. The new digital non-orthogonal multi carrier modulation scheme generalized frequency division multiplexing (GFDM) is considered owing to its efficient performance in terms of achieving higher spectral efficiency, better control of out-of-band (OOB) emissions, and lower peak to average power ratio (PAPR) when compared with the orthogonal frequency division multiplexing (OFDM) access technique. First, a low complexity analog precoder is applied on the transmitter side. Then, at the base station (BS), the analog coefficients of the hybrid equalizer are obtained by minimizing the mean square error (MSE) between the hybrid approach and the full digital counterpart. For the digital part, zero-forcing (ZF) is used to cancel the MU interference not mitigated by the analog part. The performance results show that the performance gap of the proposed hybrid scheme to the full digital counterpart reduces as the number of radio frequency (RF) chains increases. Moreover, the theoretical curves almost overlap with the simulated ones, which show that the semi-analytical approach is quite accurate. |
| Author | Miri, Manar Dinis, Rui Pedrosa, Pedro Silva, Adão Castanheira, Daniel Gameiro, Atílio Kassam, Joumana Magueta, Roberto |
| Author_xml | – sequence: 1 givenname: Joumana surname: Kassam fullname: Kassam, Joumana – sequence: 2 givenname: Manar surname: Miri fullname: Miri, Manar – sequence: 3 givenname: Roberto surname: Magueta fullname: Magueta, Roberto – sequence: 4 givenname: Daniel orcidid: 0000-0002-3858-2574 surname: Castanheira fullname: Castanheira, Daniel – sequence: 5 givenname: Pedro orcidid: 0000-0002-1434-7174 surname: Pedrosa fullname: Pedrosa, Pedro – sequence: 6 givenname: Adão orcidid: 0000-0002-7008-6773 surname: Silva fullname: Silva, Adão – sequence: 7 givenname: Rui orcidid: 0000-0002-8520-7267 surname: Dinis fullname: Dinis, Rui – sequence: 8 givenname: Atílio surname: Gameiro fullname: Gameiro, Atílio |
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