Interference, sensitivity and capacity calculations for measurement-based wireless access spectrum sharing

Interference caused by multiple uncoordinated low-power wireless access system transmitters to fixed point-to-point microwave receivers is analyzed. The analysis shows that the density of wireless access system users that can share spectrum with a point-to-point microwave system depends critically on the propagation relation, the threshold of detecting energy from point-to-point transmitters, and the allowable interference into point-to-point receivers. It is found that for reasonable assumptions of point-to-point link, wireless access system, and propagation parameters, a wireless access system employing measurement-based interference avoidance must detect energy of point-to-point transmissions far below the thermal noise floor of the wireless access system receivers which would increase their complexity. The implications to local exchange networks of wireless system alternatives that could provide access to those networks are addressed.