According to an embodiment, a lead angle control circuit is configured to control a lead angle of a motor drive signal driving a motor. The bearing unit includes an outer sleeve, an inner sleeve, a shaft, a radial dynamic pressure groove, and a lubricant agent. Such efficiency reduction apparatus may include a reducing drive roller assembly, reducing drive gear assembly, bearing assemblies, raceway restrictions, or combinations thereof. Wideband analog channel feedback is adaptable to the feedback bandwidth in uplink, and it offers frequency diversity to combat the deep fading in feedback channels. A response may be communicated on a feedback path to the second portion of the CSP. The time sequence also corresponds to positions in an output interleaved block.