Complex antennas weights for use in beamforming in a multiple-antenna system are determined based upon clear channel assessment information in a wireless networking environment. The insulative housing includes a base defining a slot therein, and a mating portion connected with the base. The inner upper ends of the flanges are connected with and tied together by an elongate, upwardly extending reinforcing member protruding above the top ring. The ROM cell with smaller size is implemented to represent the LSB bits, while the larger size ROM cell is to represent the MSB bits. In a preferred embodiment, a three-dimensional memory array having a plurality of rail-stacks forming bit lines on more than one layer, includes at least one noise detection line associated with each layer of bit lines. For this purpose, the heating unit includes a rotational speed sensor and a pressure sensor andor a power sensor.