Experimental Evaluation of Adaptive Modulation and Coding in MIMO WiMAX with Limited Feedback
We evaluate the throughput performance of an OFDM WiMAX (IEEE 802.16-2004, Section 8.3) transmission system with adaptive modulation and coding (AMC) by outdoor measurements. The standard compliant AMC utilizes a 3-bit feedback for SISO and Alamouti coded MIMO transmissions. By applying a 6-bit feed...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2008-05-01
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| Series: | EURASIP Journal on Advances in Signal Processing |
| Online Access: | http://dx.doi.org/10.1155/2008/837102 |
| _version_ | 1811212284994781184 |
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| author | Christian Mehlführer Sebastian Caban Markus Rupp |
| author_facet | Christian Mehlführer Sebastian Caban Markus Rupp |
| author_sort | Christian Mehlführer |
| collection | DOAJ |
| description | We evaluate the throughput performance of an OFDM WiMAX (IEEE 802.16-2004, Section 8.3) transmission system with adaptive modulation and coding (AMC) by outdoor measurements. The standard compliant AMC utilizes a 3-bit feedback for SISO and Alamouti coded MIMO transmissions. By applying a 6-bit feedback and spatial multiplexing with individual AMC on the two transmit antennas, the data throughput can be increased significantly for large SNR values. Our measurements show that at small SNR values, a single antenna transmission often outperforms an Alamouti transmission. We found that this effect is caused by the asymmetric behavior of the wireless channel and by poor channel knowledge in the two-transmit-antenna case. Our performance evaluation is based on a measurement campaign employing the Vienna MIMO testbed. The measurement scenarios include typical outdoor-to-indoor NLOS, outdoor-to-outdoor NLOS, as well as outdoor-to-indoor LOS connections. We found that in all these scenarios, the measured throughput is far from its achievable maximum; the loss is mainly caused by a too simple convolutional coding. |
| first_indexed | 2024-04-12T05:26:33Z |
| format | Article |
| id | doaj.art-49f9d80c821445f491f34127909fcafa |
| institution | Directory Open Access Journal |
| issn | 1687-6172 1687-6180 |
| language | English |
| last_indexed | 2024-04-12T05:26:33Z |
| publishDate | 2008-05-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | EURASIP Journal on Advances in Signal Processing |
| spelling | doaj.art-49f9d80c821445f491f34127909fcafa2022-12-22T03:46:15ZengSpringerOpenEURASIP Journal on Advances in Signal Processing1687-61721687-61802008-05-01200810.1155/2008/837102Experimental Evaluation of Adaptive Modulation and Coding in MIMO WiMAX with Limited FeedbackChristian MehlführerSebastian CabanMarkus RuppWe evaluate the throughput performance of an OFDM WiMAX (IEEE 802.16-2004, Section 8.3) transmission system with adaptive modulation and coding (AMC) by outdoor measurements. The standard compliant AMC utilizes a 3-bit feedback for SISO and Alamouti coded MIMO transmissions. By applying a 6-bit feedback and spatial multiplexing with individual AMC on the two transmit antennas, the data throughput can be increased significantly for large SNR values. Our measurements show that at small SNR values, a single antenna transmission often outperforms an Alamouti transmission. We found that this effect is caused by the asymmetric behavior of the wireless channel and by poor channel knowledge in the two-transmit-antenna case. Our performance evaluation is based on a measurement campaign employing the Vienna MIMO testbed. The measurement scenarios include typical outdoor-to-indoor NLOS, outdoor-to-outdoor NLOS, as well as outdoor-to-indoor LOS connections. We found that in all these scenarios, the measured throughput is far from its achievable maximum; the loss is mainly caused by a too simple convolutional coding.http://dx.doi.org/10.1155/2008/837102 |
| spellingShingle | Christian Mehlführer Sebastian Caban Markus Rupp Experimental Evaluation of Adaptive Modulation and Coding in MIMO WiMAX with Limited Feedback EURASIP Journal on Advances in Signal Processing |
| title | Experimental Evaluation of Adaptive Modulation and Coding in MIMO WiMAX with Limited Feedback |
| title_full | Experimental Evaluation of Adaptive Modulation and Coding in MIMO WiMAX with Limited Feedback |
| title_fullStr | Experimental Evaluation of Adaptive Modulation and Coding in MIMO WiMAX with Limited Feedback |
| title_full_unstemmed | Experimental Evaluation of Adaptive Modulation and Coding in MIMO WiMAX with Limited Feedback |
| title_short | Experimental Evaluation of Adaptive Modulation and Coding in MIMO WiMAX with Limited Feedback |
| title_sort | experimental evaluation of adaptive modulation and coding in mimo wimax with limited feedback |
| url | http://dx.doi.org/10.1155/2008/837102 |
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