Multi-layer beamforming in uplink/downlink massive MIMO Systems with multi-antenna users
In this paper, considering a hybrid architecture at the base station (BS) in an m-MIMO system, multi-antenna users transmit/receive multiple symbols to/from the BS in the uplink/downlink transmissions. In the uplink transmission, we propose a hybrid analog/digital beamformer at the BS and digital pr...
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| Vydáno v: | Signal processing Ročník 164; s. 58 - 66 |
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| Médium: | Journal Article |
| Jazyk: | angličtina |
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Elsevier B.V
01.11.2019
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| ISSN: | 0165-1684, 1872-7557 |
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| Abstract | In this paper, considering a hybrid architecture at the base station (BS) in an m-MIMO system, multi-antenna users transmit/receive multiple symbols to/from the BS in the uplink/downlink transmissions. In the uplink transmission, we propose a hybrid analog/digital beamformer at the BS and digital precoders at users. The BS designs the analog beamformer via signal-to-leakage-plus-noise ratio (SLNR) maximization criterion. Then, in the baseband, each user designs its precoder maximizing its effective signal power. Finally, the received signal at the BS is digitally combined with a regularized zero-forcing (RZF) filter. For the downlink transmission, we also design the hybrid beamformer at the BS and digital reception filters at users. In such a configuration, in order to design the hybrid beamformer, the digital precoders and the reception filters, we need much less channel knowledge compared to the large dimensional original channel matrices. Besides, as we show in the simulations, in spatially correlated channels, with smaller number of RF chains compared to the number of antennas, the performance of the proposed approaches would achieve the performance of the fully digital beamformer in terms of sum spectral efficiency (SE) and bit error rate (BER). Moreover, applying beamforming techniques at multi-antenna users further improves the overall network throughput. |
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| AbstractList | In this paper, considering a hybrid architecture at the base station (BS) in an m-MIMO system, multi-antenna users transmit/receive multiple symbols to/from the BS in the uplink/downlink transmissions. In the uplink transmission, we propose a hybrid analog/digital beamformer at the BS and digital precoders at users. The BS designs the analog beamformer via signal-to-leakage-plus-noise ratio (SLNR) maximization criterion. Then, in the baseband, each user designs its precoder maximizing its effective signal power. Finally, the received signal at the BS is digitally combined with a regularized zero-forcing (RZF) filter. For the downlink transmission, we also design the hybrid beamformer at the BS and digital reception filters at users. In such a configuration, in order to design the hybrid beamformer, the digital precoders and the reception filters, we need much less channel knowledge compared to the large dimensional original channel matrices. Besides, as we show in the simulations, in spatially correlated channels, with smaller number of RF chains compared to the number of antennas, the performance of the proposed approaches would achieve the performance of the fully digital beamformer in terms of sum spectral efficiency (SE) and bit error rate (BER). Moreover, applying beamforming techniques at multi-antenna users further improves the overall network throughput. |
| Author | Rezaei, Fatemeh Tadaion, Aliakbar |
| Author_xml | – sequence: 1 givenname: Fatemeh surname: Rezaei fullname: Rezaei, Fatemeh – sequence: 2 givenname: Aliakbar orcidid: 0000-0002-0041-6167 surname: Tadaion fullname: Tadaion, Aliakbar email: tadaion@yazd.ac.ir, tadaion@quennsu.ca |
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| Cites_doi | 10.1109/TIT.2013.2269476 10.1109/TNN.2009.2015760 10.1109/18.985982 10.1109/TWC.2004.830856 10.1109/TWC.2017.2716362 10.1109/TSP.2003.821107 10.1109/TIT.2012.2191700 10.1109/TCOMM.2015.2429646 10.1109/TSP.2017.2701321 10.1016/0024-3795(95)00199-2 10.1109/MCOM.2014.6736761 10.1109/MCOM.2017.1600400 10.1109/TWC.2010.092810.091092 10.1109/TVT.2018.2807921 10.1109/MSP.2011.2178495 10.1109/ICCChina.2014.7008332 10.1109/TVT.2018.2789661 10.1109/TWC.2006.256973 |
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