The design and construction of a 2.4GHz antenna array suitable for measurem
ent of the time, angle, and complex amplitude of path arrivals in an indoor
radio channel are described. Calibration of the array is facilitated with
the aid of an anechoic chamber. An optimal least-squares processor is deriv
ed, which compensates for systematic calibration errors. Early measurement
results are presented, and future directions of the research are indicated.