Implicit Pilots for an Efficient Channel Estimation in Simplified Massive MIMO Schemes with Precoding
This paper proposes a new channel estimation scheme based on implicit pilots, optimized for a simplified massive multiple input, multiple output (MIMO), implemented with precoding, combined with Single-Carrier with Frequency-Domain Equalization (SC-FDE) modulations. We propose an iterative receiver...
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | International Journal of Antennas and Propagation |
| Online Access: | http://dx.doi.org/10.1155/2019/5051963 |
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| _version_ | 1832560725864742912 |
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| author | Mário Marques da Silva Rui Dinis João Guerreiro |
| author_facet | Mário Marques da Silva Rui Dinis João Guerreiro |
| author_sort | Mário Marques da Silva |
| collection | DOAJ |
| description | This paper proposes a new channel estimation scheme based on implicit pilots, optimized for a simplified massive multiple input, multiple output (MIMO), implemented with precoding, combined with Single-Carrier with Frequency-Domain Equalization (SC-FDE) modulations. We propose an iterative receiver that considers an iterative detection with interference cancellation and channel estimation. The channel estimates are usually obtained with the help of pilot symbols and/or training sequences multiplexed with data symbols. Since the required overheads in massive MIMO schemes can be too high, leading to spectral degradation, the use of superimposed pilots (i.e., pilots added to data) is an efficient alternative. Three different types of preprocessing algorithms are considered in this paper: Zero-Forcing Transmitter (ZFT), Maximum Ratio Transmitter (MRT), and Equal Gain Transmitter (EGT). The main advantage of MRT and EGT is that they do not require matrix inversions. Nevertheless, some level of interference is generated in the decoding process. Such interference is mitigated by employing an optimized iterative receiver. By employing the proposed implicit pilots, the performance of MRT and EGT is very close to the Matched Filter Bound just after a few iterations, even when the number of transmit or receiver antennas is not much higher than the number of data streams. |
| format | Article |
| id | doaj-art-3c7c06a7c7684ba8ad2c4987f38e729f |
| institution | Kabale University |
| issn | 1687-5869 1687-5877 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Antennas and Propagation |
| spelling | doaj-art-3c7c06a7c7684ba8ad2c4987f38e729f2025-02-03T01:26:53ZengWileyInternational Journal of Antennas and Propagation1687-58691687-58772019-01-01201910.1155/2019/50519635051963Implicit Pilots for an Efficient Channel Estimation in Simplified Massive MIMO Schemes with PrecodingMário Marques da Silva0Rui Dinis1João Guerreiro2Instituto de Telecomunicações, PortugalInstituto de Telecomunicações, PortugalInstituto de Telecomunicações, PortugalThis paper proposes a new channel estimation scheme based on implicit pilots, optimized for a simplified massive multiple input, multiple output (MIMO), implemented with precoding, combined with Single-Carrier with Frequency-Domain Equalization (SC-FDE) modulations. We propose an iterative receiver that considers an iterative detection with interference cancellation and channel estimation. The channel estimates are usually obtained with the help of pilot symbols and/or training sequences multiplexed with data symbols. Since the required overheads in massive MIMO schemes can be too high, leading to spectral degradation, the use of superimposed pilots (i.e., pilots added to data) is an efficient alternative. Three different types of preprocessing algorithms are considered in this paper: Zero-Forcing Transmitter (ZFT), Maximum Ratio Transmitter (MRT), and Equal Gain Transmitter (EGT). The main advantage of MRT and EGT is that they do not require matrix inversions. Nevertheless, some level of interference is generated in the decoding process. Such interference is mitigated by employing an optimized iterative receiver. By employing the proposed implicit pilots, the performance of MRT and EGT is very close to the Matched Filter Bound just after a few iterations, even when the number of transmit or receiver antennas is not much higher than the number of data streams.http://dx.doi.org/10.1155/2019/5051963 |
| spellingShingle | Mário Marques da Silva Rui Dinis João Guerreiro Implicit Pilots for an Efficient Channel Estimation in Simplified Massive MIMO Schemes with Precoding International Journal of Antennas and Propagation |
| title | Implicit Pilots for an Efficient Channel Estimation in Simplified Massive MIMO Schemes with Precoding |
| title_full | Implicit Pilots for an Efficient Channel Estimation in Simplified Massive MIMO Schemes with Precoding |
| title_fullStr | Implicit Pilots for an Efficient Channel Estimation in Simplified Massive MIMO Schemes with Precoding |
| title_full_unstemmed | Implicit Pilots for an Efficient Channel Estimation in Simplified Massive MIMO Schemes with Precoding |
| title_short | Implicit Pilots for an Efficient Channel Estimation in Simplified Massive MIMO Schemes with Precoding |
| title_sort | implicit pilots for an efficient channel estimation in simplified massive mimo schemes with precoding |
| url | http://dx.doi.org/10.1155/2019/5051963 |
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