Smart antenna testbed for SDMA systems using STBC

This paper presents the experimental results of a testbed for a new SDMA system whose base stations employ multibeam antennas and space time block codes (STBC). New channel response estimation circuits are developed to estimate channel response with high accuracy at terminals and are implemented into the testbed. To evaluate the effectiveness of the system and the testbed, measurements are performed using the testbed in an anechoic chamber. The measurement results confirm that the proposed SDMA system can reduce the influence of the multipath fading effects and the new channel estimation circuit works well.