Control of the Interference and Increasing Capacity by Creating a Phase Difference between the Signals Sent in LTE Network
Subject Areas : electrical and computer engineeringKeywords: Interference control pre-coding capacity LTE OFDM,
Abstract :
According to the entry of new networks such as LTE and WiMAX that is based OFDM in country, the need to research and evaluate the performance of these networks is inevitable. In this paper we investigated the performance of different frequency allocation schemes in an LTE network. We first introduced the frequency allocation schemes include Reuse-1, Reuse-3, partial frequency reuse, sectoring, cell division region and soft frequency reuse, and then by creating a phase difference between two signals in a MISO channel in standard LTE, and combine it with some of these schemes such as sectorization and cell division region with the sectoring interference will significantly decreased in such networks. The simulation results show that the phase differences between the signals(which it’s called the one pre-order scheme) in MISO channel, due to the rotation of the antenna radiation pattern depending on the position of mobile users, and also the soft frequency reuse scheme for the full allocation of OFDM carriers to each cell and sending with less power for users of the cell center, leads to the substantial gain in the total network capacity, under the different traffics.
[1] F. Khan, LTE for 4G Mobile Broadband, Cambridge Univercity Press, New York, 2009.
[2] D. Astely, et al., "LTE: the evolution of mobile broadband," IEEE Communications Magazine, vol. 47, no. 4, pp. 44-51, Apr. 2009.
[3] T. S. Rappaport, Wireless Communications Principles and Practice, 2nd Ed., New Delhi, 2006.
[4] S. E. Elayoubi and B. Fourestie, "On frequency allocation in 3G LTE systems," in Proc. of 17th IEEE Int. Symp. on Indoor and Mobile Radio Communications, 5 pp., Helsinki, Finland, 11-14 Sep. 2006.
[5] M. Rahman and H. Yanikomeroglu, "Enhancing cell-edge performance: a downlink dynamic interference avoidance scheme with inter-cell coordination," IEEE Trans. on Wireless Communications, vol. 9, no. 4, pp. 1414-1425, Apr. 2010.
[6] Y. M. Kwon, O. K. Lee, J. Y. Lee, and M. Y. Chung, "Power control for soft fractional frequency reuse in OFDMA system," Computational Science and Its Applications, ICCSA,'10, pp. 63-71, 2010.
[7] M. Qian, et al., "Inter-cell interference coordination through adaptive soft frequency reuse in LTE networks," in Proc. IEEE Wireless Communications and Networking Conf.: MAC and Cross-Layer Design, pp. 1618-1623, Shanghai, China, 1-4 Oct. 2012.
[8] R. Prasad, OFDM for Wireless Communications Systems, Artech House, Inc., Boston-London, 2004.
[9] H. Son and S. Lee, "Bandwidth and region division for broadband multi-cell networks," IEEE Communications Letters, vol. 10, no. 5, pp. 360-362, May 2006.
[10] D. Tse and P. Viswanath, Fundamentals of Wireless Communication, Cambridge Univercity Press, New York, 2005.
[11] V. Kuhn, Wireless Communications over MIMO Channels, John Wiley & Sons, Ltd, 2007.
[12] S. Adhikari, "Critical analysis of multi-antenna systems in the LTE downlink," in Proc. IEEE Int. Conf. Internet Multimedia Services Architecture and Applications, IMSAA'09, 6 pp., Bangalore, India, 9-11 Dec. 2009.