The range increase of adaptive versus phased arrays in mobile radio systems

We compare the increase in range with multiple-antenna base stations using adaptive array combining to that of phased array combining. With adaptive arrays, the received signals at the antennas are combined to maximize signal-to-interference-plus-noise ratio rather than only form a directed beam. Although more complex to implement, adaptive arrays have the advantage of higher diversity gain and antenna gain that is not limited by the scattering angle of the multipath at the mobile. We use computer simulation to illustrate these advantages for range increase in both narrowband and spread spectrum mobile radio systems. For example, our results show that for a 3/spl deg/ scattering angle (typical in urban areas) the range increase of a phased array with 100 elements can be achieved by an adaptive array with only 10 elements.<<ETX>>

[1]  P. E. Green,et al.  A Communication Technique for Multipath Channels , 1958, Proceedings of the IRE.

[2]  W. C. Jakes,et al.  Microwave Mobile Communications , 1974 .

[3]  J.H. Winters,et al.  Optimum combining in digital mobile radio with cochannel interference , 1984, IEEE Transactions on Vehicular Technology.

[4]  W.C.-Y. Lee.  Effects on Correlation Between Two Mobile Radio Base-Station Antennas , 1973, IEEE Trans. Commun..

[5]  J.C. Liberti,et al.  Reverse channel performance improvements in CDMA cellular communication systems employing adaptive antennas , 1993, Proceedings of GLOBECOM '93. IEEE Global Telecommunications Conference.

[6]  J. H. Winters,et al.  Effect of fading correlation on adaptive arrays in digital wireless communications , 1993, Proceedings of ICC '93 - IEEE International Conference on Communications.

[7]  G. K. Chan.  Effects of sectorization on the spectrum efficiency of cellular radio systems , 1992 .

[8]  Randy L. Haupt,et al.  Introduction to Adaptive Arrays , 1980 .

[9]  J. H. Winters.  Signal acquisition and tracking with adaptive arrays in the digital mobile radio system IS-54 with flat fading , 1993 .

[10]  J. Treichler,et al.  A new approach to multipath correction of constant modulus signals , 1983 .

[11]  Thomas Kailath,et al.  Antenna arrays for CDMA systems with multipath , 1993, Proceedings of MILCOM '93 - IEEE Military Communications Conference.

[12]  Shawn Patrick Stapleton,et al.  A cellular base station phased array antenna system , 1993, IEEE 43rd Vehicular Technology Conference.

[13]  Richard D. Gitlin,et al.  The impact of antenna diversity on the capacity of wireless communication systems , 1994, IEEE Trans. Commun..

[14]  Arogyaswami Paulraj,et al.  Performance of CDMA Cellular Networks with Base-Station Antenna Arrays , 1994, Mobile Communications.

[15]  G. Thiele,et al.  Antenna theory and design , 1981 .

[16]  Kenichi Kagoshima,et al.  Diversity antennas for base and mobile stations in land mobile communication systems , 1991 .

[17]  Hideichi Sasaoka,et al.  A development of GMSK/TDMA system with CMA adaptive array for land mobile communications , 1991, [1991 Proceedings] 41st IEEE Vehicular Technology Conference.

[18]  J. P. McGeehan,et al.  The performance enhancement of multibeam adaptive base-station antennas for cellular land mobile radio systems , 1990 .