Abstract
Downlink beamforming is an efficient technique in TD-LTE systems to provide the diversity or multiplexing gains when suitable antenna mode switching algorithm is applied. Since the radio channel information is not perfectly obtained at the transmitter, the antenna mode decided by the base station (BS) is not often suitable, and the cell throughput decreases especially when the user equipment (UE) with high speed mobility and there is a large feedback delay. To solve this problem, a dynamic antenna mode switching (DAMS) algorithm is proposed for the downlink transmission in TD-LTE systems, where a cell-specific offset and a UE-specific offset are utilized to adjust the channel quality indicator (CQI) fed back from UE and determine the suitable antenna mode. According to the simulation results, compared with the conventional mode switching (CMS) algorithm, the proposed DAMS algorithm enhances both the cell spectrum efficiency and the initial transmission success ratio (ITSR) dramatically.
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References
3GPP TS 36.213, Physical Layer Procedures (September 2010)
Ordoez, L.G., Palomar, D.P., Pages-Zamora, A., Rodriguez Fonollosa, J.: High-SNR Analytical Performance of Spatial Multiplexing MIMO Systems with CSI. IEEE Trans. Signal Process. 55, 5447–5463 (2007)
Zijian, B., Spiegel, C., Bruck, G.H., Jung, P., Horvat, M., Berkmann, J., Drewes, C., Gunzelmann, B.: Dynamic Transmission Mode Selection in LTE/LTE-Advanced System. In: 3rd IEEE International Symposium on Applied Sciences in Biomedical and Communication Technologies, pp. 1–5. IEEE Press, Rome (2010)
Chulhan, L., Chan-Byoung, C., Vishwanath, S., Heath, R.W.: Adaptive Mode Switching in the MIMO Broadcast Channel. In: IEEE Radio and Wireless Symposium, pp. 711–714. IEEE Press, Orlando (2008)
Yong-Up, J., Kwon, H.M., Lee, Y.H.: Adaptive Mode Selection for Multiuser MIMO Downlink Systems. In: 63rd IEEE Vehicular Technology Conference, pp. 2003–2007. IEEE Press, Melbourne (2006)
Schellmann, M., Thiele, L., Haustein, T., Jungnickel, V.: Spatial Transmission Mode Switching in Multiuser MIMO-OFDM Systems With User Fairness. IEEE Trans. Veh. Technol. 59, 235–247 (2010)
Tran, M., Halls, D., Nix, A., Doufexi, A., Beach, M.: Mobile WiMAX Downlink Performance Analysis with Adaptive MIMO Switching. In: IEEE Mobile WiMAX Symposium, pp. 147–151. IEEE Press, Napa Valley (2009)
Adhikari, S.: Downlink transmission mode selection and switching algorithm for LTE. In: 3rd International Conference on Communication Systems and Networks, pp. 1–10. IEEE Press, Bangalore (2011)
Pedersen, K.I., Frederiksen, F., Kolding, T.E., Lootsma, T.F., Mogensen, P.E.: Performance of High-Speed Downlink Packet Access in Coexistence with Dedicated Channels. IEEE Trans. Veh. Technol. 56, 1262–1271 (2007)
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Yuan, L., Mugen, P., Wenbo, W. (2011). An Enhanced Algorithm for the Transmission Mode Switching in TD-LTE Downlink Systems. In: Cheng, Y., Eun, D.Y., Qin, Z., Song, M., Xing, K. (eds) Wireless Algorithms, Systems, and Applications. WASA 2011. Lecture Notes in Computer Science, vol 6843. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-23490-3_30
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DOI: https://doi.org/10.1007/978-3-642-23490-3_30
Publisher Name: Springer, Berlin, Heidelberg
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