Merger of polarization and spatial diversity by moving a pair of orthogonally polarized dipoles

Size and cost considerations of handheld terminals limit the use of antenna array for combating multipath fading in these applications. Recently, a synthetic array based on moving a single antenna was proposed for handheld terminals. This technique however fails to provide enough diversity gain when the channel is spatially correlated. A combination technique based on merging polarization and spatial diversity and motions of a crossed dipole is proposed here. The diversity performance of the crossed dipole synthetic array (XSA) is then compared to that of a single dipole synthetic array. A closed form expression is also derived for calculating the cumulative distribution function of summation of correlated central chi-squared random variables with four degrees of freedom which arises in the XSA performance analysis. Finally, the proposed technique is put into test through an extensive set of measurements.

[1]  Steven Kay,et al.  Fundamentals Of Statistical Signal Processing , 2001 .

[2]  V. Stoiljkovic,et al.  Polarization diversity measurements and analysis for antenna configurations at 1800 MHz , 2004, IEEE Transactions on Antennas and Propagation.

[3]  Gregory J. Pottie,et al.  Evaluation of personal communications dual-antenna handset diversity performance , 1998 .

[4]  Andreas Polydoros,et al.  DS-CDMA code acquisition in the presence of correlated fading - Part I: theoretical aspects , 2004, IEEE Transactions on Communications.

[5]  D. Hill,et al.  Spatial-correlation functions of fields and energy density in a reverberation chamber , 2002 .

[6]  D. G. Brennan,et al.  Linear diversity combining techniques , 2003 .

[7]  P. Hahn.  Theoretical Diversity Improvement in Multiple Frequency Shift Keying , 1962 .

[8]  A. Field.  Communications , 1963, The Journal of Asian Studies.

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

[10]  S. Stergiopoulos,et al.  A new passive synthetic aperture technique for towed arrays , 1992 .

[11]  S. Seidel,et al.  914 MHz path loss prediction models for indoor wireless communications in multifloored buildings , 1992 .

[12]  W. Stutzman,et al.  Spatial, polarization, and pattern diversity for wireless handheld terminals , 2001 .

[13]  W.C.Y. Lee,et al.  Estimate of local average power of a mobile radio signal , 1985, IEEE Transactions on Vehicular Technology.

[14]  Giovanni Emanuele Corazza,et al.  DS-CDMA code acquisition in the presence of correlated fading-part II: application to cellular networks , 2004, IEEE Transactions on Communications.

[15]  H. V. Trees.  Detection, Estimation, And Modulation Theory , 2001 .

[16]  J. Pierce.  Theoretical Diversity Improvement in Frequency-Shift Keying , 1958, Proceedings of the IRE.

[17]  Jakob Nielsen,et al.  Signal detection performance in Rayleigh fading environments with a moving antenna , 2010 .

[18]  M. Schwartz,et al.  Communication Systems and Techniques , 1996, IEEE Communications Magazine.

[19]  A.M.D. Turkmani,et al.  An experimental evaluation of the performance of two-branch space and polarization diversity schemes at 1800 MHz , 1995 .