A Multistage Decision-Feedback Receiver Design for LTE Uplink in Mobile Time-Variant Environments
Single-carrier-frequency division multiple access (SC-FDMA) has recently become the preferred uplink transmission scheme in long-term evolution (LTE) systems. Similar to orthogonal frequency division multiple access (OFDMA), SC-FDMA is highly sensitive to frequency offsets caused by oscillator inacc...
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | International Journal of Antennas and Propagation |
| Online Access: | http://dx.doi.org/10.1155/2012/941458 |
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| author | Juinn-Horng Deng Shu-Min Liao |
| author_facet | Juinn-Horng Deng Shu-Min Liao |
| author_sort | Juinn-Horng Deng |
| collection | DOAJ |
| description | Single-carrier-frequency division multiple access (SC-FDMA) has recently become the preferred uplink transmission scheme in long-term evolution (LTE) systems. Similar to orthogonal frequency division multiple access (OFDMA), SC-FDMA is highly sensitive to frequency offsets caused by oscillator inaccuracies and Doppler spread, which lead to intercarrier interference (ICI). This work proposes a multistage decision-feedback structure to mitigate the ICI effect and enhance system performance in time-variant environments. Based on the block-type pilot arrangement of the LTE uplink type 1 frame structure, the time-domain least squares (TDLS) method and polynomial-based curve-fitting algorithm are employed for channel estimation. Instead of using a conventional equalizer, this work uses a group frequency-domain equalizer (GFDE) to reduce computational complexity. Furthermore, this work utilizes a dual iterative structure of group parallel interference cancellation (GPIC) and frequency-domain group parallel interference cancellation (FPIC) to mitigate the ICI effect. Finally, to optimize system performance, this work applies a novel error-correction scheme. Simulation results demonstrate the bit error rate (BER) performance is markedly superior to that of the conventional full-size receiver based on minimum mean square error (MMSE). This structure performs well and is a flexible choice in mobile environments using the SC-FDMA scheme. |
| format | Article |
| id | doaj-art-c6a12ebcb862401ca1ac8a28b33ce9d6 |
| institution | Kabale University |
| issn | 1687-5869 1687-5877 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Antennas and Propagation |
| spelling | doaj-art-c6a12ebcb862401ca1ac8a28b33ce9d62025-02-03T01:22:32ZengWileyInternational Journal of Antennas and Propagation1687-58691687-58772012-01-01201210.1155/2012/941458941458A Multistage Decision-Feedback Receiver Design for LTE Uplink in Mobile Time-Variant EnvironmentsJuinn-Horng Deng0Shu-Min Liao1Communication Research Center and Department of Communications Engineering, Yuan Ze University, 135 Yuan-Tung Road, Chung-Li, Taoyuan 32003, TaiwanCommunication Research Center and Department of Communications Engineering, Yuan Ze University, 135 Yuan-Tung Road, Chung-Li, Taoyuan 32003, TaiwanSingle-carrier-frequency division multiple access (SC-FDMA) has recently become the preferred uplink transmission scheme in long-term evolution (LTE) systems. Similar to orthogonal frequency division multiple access (OFDMA), SC-FDMA is highly sensitive to frequency offsets caused by oscillator inaccuracies and Doppler spread, which lead to intercarrier interference (ICI). This work proposes a multistage decision-feedback structure to mitigate the ICI effect and enhance system performance in time-variant environments. Based on the block-type pilot arrangement of the LTE uplink type 1 frame structure, the time-domain least squares (TDLS) method and polynomial-based curve-fitting algorithm are employed for channel estimation. Instead of using a conventional equalizer, this work uses a group frequency-domain equalizer (GFDE) to reduce computational complexity. Furthermore, this work utilizes a dual iterative structure of group parallel interference cancellation (GPIC) and frequency-domain group parallel interference cancellation (FPIC) to mitigate the ICI effect. Finally, to optimize system performance, this work applies a novel error-correction scheme. Simulation results demonstrate the bit error rate (BER) performance is markedly superior to that of the conventional full-size receiver based on minimum mean square error (MMSE). This structure performs well and is a flexible choice in mobile environments using the SC-FDMA scheme.http://dx.doi.org/10.1155/2012/941458 |
| spellingShingle | Juinn-Horng Deng Shu-Min Liao A Multistage Decision-Feedback Receiver Design for LTE Uplink in Mobile Time-Variant Environments International Journal of Antennas and Propagation |
| title | A Multistage Decision-Feedback Receiver Design for LTE Uplink in Mobile Time-Variant Environments |
| title_full | A Multistage Decision-Feedback Receiver Design for LTE Uplink in Mobile Time-Variant Environments |
| title_fullStr | A Multistage Decision-Feedback Receiver Design for LTE Uplink in Mobile Time-Variant Environments |
| title_full_unstemmed | A Multistage Decision-Feedback Receiver Design for LTE Uplink in Mobile Time-Variant Environments |
| title_short | A Multistage Decision-Feedback Receiver Design for LTE Uplink in Mobile Time-Variant Environments |
| title_sort | multistage decision feedback receiver design for lte uplink in mobile time variant environments |
| url | http://dx.doi.org/10.1155/2012/941458 |
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