Adaptive Antenna Arrays

Golden

Valenzuela

Wolniansky

Since March, 1995, our work has been directed towards the base station application, in particular an applique approach for IS-136 PCS, in which the antenna array processing serves as a transparent front-end to an existing IS-136 base station. With R. Cupo, and K. Sherman, and P. Sharpe, we put together a research prototype of a 4-antenna IS-136 applique, which was evaluated at Lucent Technologies Network Wireless Systems field test facility at Whippany, NJ during the summer and fall of '96. This field test was extremely successful. In comparison to a 2-branch reference system, evaluated simultaneously on a different channel, our 4-branch applique performed as follows:

• Range extension: Up to 4.4 dB reduction in required signal-to-noise ratio (SNR) at 10^-2 bit error rate (BER) relative to the reference system.
• Interference suppression: Demonstrated operation at 10^-2 BER even with an equal power interferer in an adjacent vehicle. (The reference system was completely unusable at this interference level.)

Recent publications on adaptive arrays:

• A Four-Element Adaptive Antenna Array for IS-136 PCS Base Stations , R. L. Cupo, G. D. Golden, et. al., Proc. VTC-97, May 1997.

• Adaptive Antenna Array Applique Field Test , G. D. Golden, J. H. Winters, Fourth Workshop on Smart Antennas in Wireless Mobile Communications, Stanford Univ., July 24-25, 1997.

• Adaptive Antennas for IS-136 , G. D. Golden, J. H. Winters, Third Workshop on Smart Antennas in Wireless Mobile Communications, Stanford Univ., July 23-25, 1996.