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Extra resources for 10.Communications
These holes will adversely affect call quality and grade of service. This has a direct and deleterious impact on system capacity, subscriber satisfaction, and network revenue. 515 INTERFERENCE MITIGATION TECHNIQUES In the initial phase of a cellular network deployment, capacity is not an issue, and hence a cellular service provider designs the network to maximize coverage. Base stations are sited to maximize the range of operation, which depends on the propagation characteristics of the particular location.
2. In a typical seven-cell reuse pattern, 1 2 3 1 2 3 (a) 1 2 6 3 5 4 1 2 6 3 5 4 (b) Figure 2. Sectorization in a typical cellular system: (a) 120Њ sectorization and (b) 60Њ sectorization. 516 COCHANNEL INTERFERENCE the number of interferers in the first tier is six, but when 120Њ sectorization is employed, the number of interferers is reduced to two. When the mobile is at the edge of the cell, a reuse factor of 12 is required to maintain a CIR of 18 dB. However, with 120Њ sectorization, a CIR of 18 dB can be achieved with a reuse factor of 7.
Performance of CDMA mobile communication systems using antenna arrays, Proc. IEEE Int. Conf. , 4: 153–156, 1993. 5. T. Nagayasu and S. Sampei, Elimination of adjacent channel interference via nonlinear filters, Electron. Commun. , 77 (5): 23–32, 1994. 6. J. H. Winters, Signal acquisition and tracking with adaptive arrays in the digital mobile radio system IS-54 with flat fading, IEEE Trans. Veh. , VT-42: 377–384, 1993. 7. J. H. Winters, J. Salz, and R. D. Gitlin, The impact of antenna diversity on the capacity of wireless communication systems, IEEE Trans.